Guard use of concepts with feature test macro

[gcc.git] / libstdc++-v3 / ChangeLog

2019-10-25  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/range_cmp.h: Check __cpp_lib_concepts before defining
        concepts. Fix comment.

2019-10-25  Gerald Pfeifer  <gerald@pfeifer.com>

        * doc/xml/manual/policy_data_structures_biblio.xml: Switch
        pubs.opengroup.org to https.

2019-10-25  Gerald Pfeifer  <gerald@pfeifer.com>
        
        * doc/xml/gnu/gpl-3.0.xml: Switch www.gnu.org to https.

2019-09-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

        * doc/xml/manual/status_cxx2020.xml: Add rows and update status.

2019-10-24  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/allocator.h (allocator<void>): Restore the explicit
        specialization for C++20, but make its API consistent with the primary
        template.
        (allocator::~allocator()): Restore the destructor for C++20, but make
        it constexpr.
        * testsuite/20_util/allocator/rebind_c++20.cc: Check allocator<void>.
        * testsuite/20_util/allocator/requirements/typedefs_c++20.cc: Likewise.
        * testsuite/20_util/allocator/void.cc: Check that constructors and
        destructors are trivial. Check for converting constructor in C++20.
        * testsuite/ext/malloc_allocator/variadic_construct.cc: Simplify
        dejagnu target selector.
        * testsuite/ext/new_allocator/variadic_construct.cc: Likewise.

        * include/experimental/executor (__use_future_ct, use_future_t):
        Define partial specializations for std::allocator.
        (__use_future_ch): Overload constructor for completion tokens using
        std::allocator.

        PR libstdc++/88338 Implement P0898R3, C++20 concepts library
        * doc/xml/manual/status_cxx2020.xml: Update status.
        * doc/html/*: Regenerate.
        * testsuite/std/concepts/1.cc: New test.
        * testsuite/std/concepts/2.cc: New test.

        * include/bits/random.h (uniform_random_bit_generator): Define for
        C++20.
        * testsuite/26_numerics/random/concept.cc: New test.
        * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.

2019-10-23  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/functional (invoke): Add constexpr for C++20.
        * include/std/version (__cpp_lib_constexpr_invoke): Define.
        * testsuite/20_util/function_objects/invoke/constexpr.cc: New test.

        PR c++/91369 Implement P0784R7 changes to allocation and construction
        * include/bits/alloc_traits.h: Include <bits/stl_construct.h>.
        (allocator_traits::_S_allocate, allocator_traits::_S_construct)
        (allocator_traits::_S_destroy, allocator_traits::_S_max_size)
        (allocator_traits::_S_select, allocator_traits::allocate)
        (allocator_traits::deallocate, allocator_traits::construct)
        (allocator_traits::destroy, allocator_traits::max_size)
        (allocator_traits::select_on_container_copy_construction)
        (allocator_traits<allocator<T>>): Add constexpr specifier for C++20.
        (allocator_traits<allocator<T>>::construct): Use construct_at.
        (allocator_traits<allocator<T>>::destroy): Use destroy_at.
        (__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Add constexpr
        specifier.
        (_Destroy(ForwardIterator, ForwardIterator, Alloc&))
        (_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move here
        from <bits/stl_construct.h>.
        * include/bits/allocator.h (allocator::~allocator): Remove for C++20.
        (allocator::allocate, allocate::deallocate): Define for C++20 and up.
        (operator==, operator!=): Add constexpr specifier for C++20.
        * include/bits/stl_construct.h: Don't include <ext/alloc_traits.h>.
        (destroy_at): For C++20 add constexpr specifier and support for
        destroying arrays.
        (construct_at): Define new function for C++20.
        (_Construct): Return result of placement new-expression. For C++11 and
        up add constexpr. For C++20 dispatch to std::construct_at during
        constant evaluation.
        (_Destroy(pointer)): Add constexpr specifier. For C++20 dispatch to
        std::destroy_at during constant evaluation.
        (_Destroy_aux::__destroy, _Destroy_n_aux::__destroy_n): Add constexpr
        specifier for C++20.
        (_Destroy(ForwardIterator, ForwardIterator))
        (_Destroy(ForwardIterator, Size)): Likewise. Do not elide trivial
        destructors during constant evaluation.
        (destroy, destroy_n): Add constexpr specifier for C++20.
        (_Destroy(ForwardIterator, ForwardIterator, Alloc&))
        (_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move to
        <bits/alloc_traits.h>, to remove dependency on allocators.
        * include/bits/stl_uninitialized.h: Include <ext/alloc_traits.h>.
        Include <bits/stl_pair.h> instead of <utility>.
        * include/ext/alloc_traits.h: Always include <bits/alloc_traits.h>.
        (__alloc_traits::construct, __alloc_traits::destroy)
        (__alloc_traits::_S_select_on_copy, __alloc_traits::_S_on_swap): Add
        constexpr specifier.
        * include/ext/malloc_allocator.h  (operator==, operator!=): Add
        constexpr specifier for C++20.
        * include/ext/new_allocator.h (operator==, operator!=): Likewise.
        * testsuite/20_util/headers/memory/synopsis.cc: Add constexpr.
        * testsuite/20_util/scoped_allocator/69293_neg.cc: Ignore additional
        errors due to constexpr function called after failed static_assert.
        * testsuite/20_util/specialized_algorithms/construct_at/1.cc: New test.
        * testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
        Ignore additional errors due to constexpr function called after failed
        static_assert.
        * testsuite/23_containers/vector/cons/destructible_neg.cc: Likewise.

        * testsuite/20_util/bind/91371.cc: Fix test to compile as C++11.

        * include/debug/helper_functions.h (__valid_range): Change
        _GLIBCXX_CONSTEXPR to _GLIBCXX14_CONSTEXPR.

        * include/ext/throw_allocator.h (throw_allocator_base): Qualify
        size_t and ptrdiff_t.

        * include/ext/pb_ds/detail/bin_search_tree_/bin_search_tree_.hpp:
        Use detail::rebind_traits.
        * include/ext/pb_ds/detail/bin_search_tree_/node_iterators.hpp:
        Likewise.
        * include/ext/pb_ds/detail/bin_search_tree_/traits.hpp: Likewise.
        * include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp: Likewise.
        * include/ext/pb_ds/detail/binary_heap_/entry_cmp.hpp: Likewise.
        * include/ext/pb_ds/detail/binary_heap_/entry_pred.hpp: Likewise.
        * include/ext/pb_ds/detail/binary_heap_/point_const_iterator.hpp:
        Likewise.
        * include/ext/pb_ds/detail/binomial_heap_base_/binomial_heap_base_.hpp:
        Likewise.
        * include/ext/pb_ds/detail/branch_policy/branch_policy.hpp: Likewise.
        * include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp: Likewise.
        * include/ext/pb_ds/detail/cond_dealtor.hpp: Likewise.
        * include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp (has_eq_fn): Likewise.
        * include/ext/pb_ds/detail/gp_hash_table_map_/gp_ht_map_.hpp: Likewise.
        * include/ext/pb_ds/detail/hash_fn/ranged_hash_fn.hpp: Likewise.
        * include/ext/pb_ds/detail/hash_fn/ranged_probe_fn.hpp: Likewise.
        * include/ext/pb_ds/detail/left_child_next_sibling_heap_/
        left_child_next_sibling_heap_.hpp: Likewise.
        * include/ext/pb_ds/detail/left_child_next_sibling_heap_/node.hpp:
        Likewise.
        * include/ext/pb_ds/detail/left_child_next_sibling_heap_/
        point_const_iterator.hpp: Likewise.
        * include/ext/pb_ds/detail/list_update_map_/lu_map_.hpp: Likewise.
        * include/ext/pb_ds/detail/ov_tree_map_/
        constructors_destructor_fn_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/ov_tree_map_/node_iterators.hpp: Likewise.
        * include/ext/pb_ds/detail/ov_tree_map_/ov_tree_map_.hpp: Likewise.
        * include/ext/pb_ds/detail/pairing_heap_/pairing_heap_.hpp: Likewise.
        * include/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp: Likewise.
        * include/ext/pb_ds/detail/pat_trie_/pat_trie_base.hpp: Likewise.
        * include/ext/pb_ds/detail/rb_tree_map_/node.hpp: Likewise.
        * include/ext/pb_ds/detail/rc_binomial_heap_/rc.hpp: Likewise.
        * include/ext/pb_ds/detail/splay_tree_/node.hpp: Likewise.
        * include/ext/pb_ds/detail/thin_heap_/thin_heap_.hpp: Likewise.
        * include/ext/pb_ds/detail/trie_policy/sample_trie_access_traits.hpp:
        Likewise.
        * include/ext/pb_ds/detail/type_utils.hpp: Fix typo in comment.
        * include/ext/pb_ds/detail/types_traits.hpp (stored_value): Add
        bool parameter to control whether the hash value is stored.
        (select_base_type): New class template and partial specialization.
        (maybe_null_type): Likewise.
        (rebind_traits): New class template.
        (type_base): Remove four nearly identical specializations.
        (type_dispatch): Remove.
        (type_traits): Use select_base_type and maybe_null_type instead of
        type_base to control differences between specializations.
        * include/ext/pb_ds/list_update_policy.hpp: Use detail::rebind_traits.
        * include/ext/pb_ds/priority_queue.hpp: Likewise.
        * include/ext/pb_ds/tree_policy.hpp: Likewise.
        * include/ext/pb_ds/trie_policy.hpp: Likewise.

        * include/backward/hash_set (hash_set): Use __alloc_traits.
        * include/backward/hashtable.h (_Hashtable): Likewise.
        * include/ext/alloc_traits.h (__alloc_traits::allocate): Add overload
        taking a hint.
        * include/ext/extptr_allocator.h (_ExtPtr_allocator::allocate): Ignore
        hint.
        * include/ext/slist (_Slist_base): Use __alloc_traits.
        * include/tr1/hashtable.h (_Hashtable): Likewise.
        * include/tr1/regex (match_results): Use vector::const_reference
        instead of assuming the allocator defines it.
        * testsuite/backward/hash_map/23528.cc: Use allocator_traits in C++11.
        * testsuite/tr1/6_containers/unordered_map/capacity/29134-map.cc: Use
        __gnu_test::max_size.
        * testsuite/tr1/6_containers/unordered_multimap/capacity/
        29134-multimap.cc: Likewise.
        * testsuite/tr1/6_containers/unordered_multiset/capacity/
        29134-multiset.cc: Likewise.
        * testsuite/tr1/6_containers/unordered_set/capacity/29134-set.cc:
        Likewise.

2019-10-22  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_abi.h: Restore use of tr1/unordered_map
        when compiled as C++98.

        * include/bits/memoryfwd.h (uses_allocator): Do not declare for C++98.
        * testsuite/17_intro/names.cc: Check uses_allocator in C++98.

        * include/bits/alloc_traits.h
        (allocator_traits<allocator<T>>::allocate): Ignore hint for C++20.
        (allocator_traits<allocator<T>>::construct): Perform placement new
        directly for C++20, instead of calling allocator<T>::construct.
        (allocator_traits<allocator<T>>::destroy): Call destructor directly
        for C++20, instead of calling allocator<T>::destroy.
        (allocator_traits<allocator<T>>::max_size): Return value directly
        for C++20, instead of calling std::allocator<T>::max_size().
        (__do_alloc_on_copy, __do_alloc_on_move, __do_alloc_on_swap): Do not
        define for C++17 and up.
        (__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Use if-constexpr
        for C++17 and up, instead of tag dispatching.
        * include/bits/allocator.h (allocator<void>): Remove for C++20.
        (allocator::pointer, allocator::const_pointer, allocator::reference)
        (allocator::const_reference, allocator::rebind): Remove for C++20.
        * include/bits/basic_string.h (basic_string): Use __alloc_traits to
        rebind allocator.
        * include/bits/memoryfwd.h (allocator<void>): Remove for C++20.
        * include/ext/debug_allocator.h: Use __alloc_traits for rebinding.
        * include/ext/malloc_allocator.h (malloc_allocator::~malloc_allocator)
        (malloc_allocator::pointer, malloc_allocator::const_pointer)
        (malloc_allocator::reference, malloc_allocator::const_reference)
        (malloc_allocator::rebind, malloc_allocator::max_size)
        (malloc_allocator::construct, malloc_allocator::destroy): Do not
        define for C++20.
        (malloc_allocator::_M_max_size): Define new function.
        * include/ext/new_allocator.h (new_allocator::~new_allocator)
        (new_allocator::pointer, new_allocator::const_pointer)
        (new_allocator::reference, new_allocator::const_reference)
        (new_allocator::rebind, new_allocator::max_size)
        (new_allocator::construct, new_allocator::destroy): Do not
        define for C++20.
        (new_allocator::_M_max_size): Define new function.
        * include/ext/rc_string_base.h (__rc_string_base::_Rep): Use
        __alloc_traits to rebind allocator.
        * include/ext/rope (_Rope_rep_base, _Rope_base): Likewise.
        (rope::rope(CharT, const allocator_type&)): Use __alloc_traits
        to construct character.
        * include/ext/slist (_Slist_base): Use __alloc_traits to rebind
        allocator.
        * include/ext/sso_string_base.h (__sso_string_base::_M_max_size):
        Use __alloc_traits.
        * include/ext/throw_allocator.h (throw_allocator): Do not use optional
        members of std::allocator, use __alloc_traits members instead.
        * include/ext/vstring.h (__versa_string): Use __alloc_traits.
        * include/ext/vstring_util.h (__vstring_utility): Likewise.
        * include/std/memory: Include <bits/alloc_traits.h>.
        * testsuite/20_util/allocator/8230.cc: Use __gnu_test::max_size.
        * testsuite/20_util/allocator/rebind_c++20.cc: New test.
        * testsuite/20_util/allocator/requirements/typedefs.cc: Do not check
        for pointer, const_pointer, reference, const_reference or rebind in
        C++20.
        * testsuite/20_util/allocator/requirements/typedefs_c++20.cc: New test.
        * testsuite/23_containers/deque/capacity/29134.cc: Use
        __gnu_test::max_size.
        * testsuite/23_containers/forward_list/capacity/1.cc: Likewise.
        * testsuite/23_containers/list/capacity/29134.cc: Likewise.
        * testsuite/23_containers/map/capacity/29134.cc: Likewise.
        * testsuite/23_containers/multimap/capacity/29134.cc: Likewise.
        * testsuite/23_containers/multiset/capacity/29134.cc: Likewise.
        * testsuite/23_containers/set/capacity/29134.cc: Likewise.
        * testsuite/23_containers/vector/capacity/29134.cc: Likewise.
        * testsuite/ext/malloc_allocator/variadic_construct.cc: Do not run
        test for C++20.
        * testsuite/ext/new_allocator/variadic_construct.cc: Likewise.
        * testsuite/ext/vstring/capacity/29134.cc: Use __gnu_test::max_size.
        * testsuite/util/replacement_memory_operators.h: Do not assume
        Alloc::pointer exists.
        * testsuite/util/testsuite_allocator.h (__gnu_test::max_size): Define
        helper to call max_size for any allocator.

2019-10-22  Andreas Schwab  <schwab@suse.de>

        * config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.

2019-10-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/92143
        * libsupc++/new_opa.cc (operator new) [__APPLE__]: Increase alignment
        to at least sizeof(void*).

        * include/bits/range_cmp.h (ranges::less::operator()): Inline the
        logic from std::less::operator() to remove the dependency on it.

2019-10-17  Jonathan Wakely  <jwakely@redhat.com>

        * doc/doxygen/user.cfg.in (INPUT): Add new C++17 and C++20 headers.

        * include/Makefile.am: Add new header.
        * include/Makefile.in: Regenerate.
        * include/bits/range_cmp.h: New header for C++20 function objects.
        * include/std/functional: Include new header.
        * testsuite/20_util/function_objects/identity/1.cc: New test.
        * testsuite/20_util/function_objects/range.cmp/equal_to.cc: New test.
        * testsuite/20_util/function_objects/range.cmp/greater.cc: New test.
        * testsuite/20_util/function_objects/range.cmp/greater_equal.cc: New
        test.
        * testsuite/20_util/function_objects/range.cmp/less.cc: New test.
        * testsuite/20_util/function_objects/range.cmp/less_equal.cc: New test.
        * testsuite/20_util/function_objects/range.cmp/not_equal_to.cc: New
        test.

        PR libstdc++/92124
        * include/bits/forward_list.h
        (_M_move_assign(forward_list&&, false_type)): Do not use
        __make_move_if_noexcept, instead move unconditionally.
        * include/bits/stl_deque.h (_M_move_assign2(deque&&, false_type)):
        Likewise.
        * include/bits/stl_list.h (_M_move_assign(list&&, false_type)):
        Likewise.
        * include/bits/stl_vector.h (_M_move_assign(vector&&, false_type)):
        Likewise.
        * testsuite/23_containers/vector/92124.cc: New test.

2019-10-16  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/c++config (_GLIBCXX_BUILTIN_IS_SAME_AS): Define to
        one of __is_same_as or __is_same when available.
        * include/std/concepts (__detail::__same_as): Use std::is_same_v.
        * include/std/type_traits (is_same) [_GLIBCXX_BUILTIN_IS_SAME_AS]:
        Use new macro instead of __is_same_as.
        (is_same) [!_GLIBCXX_BUILTIN_IS_SAME_AS]: Restore partial
        specialization.
        (is_same_v) [_GLIBCXX_BUILTIN_IS_SAME_AS]: Use new macro.
        (is_same_v) [!_GLIBCXX_BUILTIN_IS_SAME_AS]: Use std::is_same.

2019-10-16  François Dumont  <fdumont@gcc.gnu.org>

        * src/c++11/debug.cc (print_field): Replace constness_names <unknown>
        entry with <unknown constness>. Replace state_names <unknown> entry with
        <unknown state>.

2019-10-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/Makefile.am: Add new header.
        * include/Makefile.in: Regenerate.
        * include/precompiled/stdc++.h: Include <concepts>.
        * include/std/concepts: New header for C++20.
        * include/std/version (__cpp_lib_concepts): Define.
        * scripts/create_testsuite_files: Look for test files in new std
        directory.
        * testsuite/libstdc++-dg/conformance.exp: Likewise.
        * testsuite/std/concepts/concepts.callable/invocable.cc: New test.
        * testsuite/std/concepts/concepts.callable/regular_invocable.cc: New
        test.
        * testsuite/std/concepts/concepts.callable/relation.cc: New test.
        * testsuite/std/concepts/concepts.callable/strictweakorder.cc: New
        test.
        * testsuite/std/concepts/concepts.lang/concept.arithmetic/
        floating_point.cc: New test.
        * testsuite/std/concepts/concepts.lang/concept.arithmetic/integral.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.arithmetic/
        signed_integral.cc: New test.
        * testsuite/std/concepts/concepts.lang/concept.arithmetic/
        unsigned_integral.cc: New test.
        * testsuite/std/concepts/concepts.lang/concept.assignable/1.cc: New
        test.
        * testsuite/std/concepts/concepts.lang/concept.common/1.cc: New test.
        * testsuite/std/concepts/concepts.lang/concept.commonref/1.cc: New
        test.
        * testsuite/std/concepts/concepts.lang/concept.constructible/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.convertible/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.copyconstructible/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.defaultconstructible/
        1.cc: New test.
        * testsuite/std/concepts/concepts.lang/concept.derived/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.destructible/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.moveconstructible/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.same/1.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc:
        New test.
        * testsuite/std/concepts/concepts.lang/concept.swappable/
        swappable_with.cc: New test.
        * testsuite/std/concepts/concepts.object/copyable.cc: New test.
        * testsuite/std/concepts/concepts.object/movable.cc: New test.
        * testsuite/std/concepts/concepts.object/regular.cc: New test.
        * testsuite/std/concepts/concepts.object/semiregular.cc: New test.

        * include/std/type_traits (is_same): Replace partial specialization
        by using __is_same_as built-in in primary template.
        (is_same_v): Use __is_same_as built-in instead of instantiating the
        is_same trait.

        PR libstdc++/92059
        * include/tr2/dynamic_bitset (__dynamic_bitset_base): Define all
        special member functions as defaulted. Add noexcept to most members.
        (__dynamic_bitset_base(size_t, unsigned long long, const _Alloc&)):
        Mask off unwanted bits in the __val parameter. Avoid undefined left
        shifts.
        (__dynamic_bitset_base::_M_assign): Remove.
        (__dynamic_bitset_base::_M_do_reset): Use std::fill.
        (__dynamic_bitset_base::_M_are_all_aux): Avoid integer promotion when
        block_type has lower rank than int.
        (dynamic_bitset): Add noexcept to most members. Use injected-class-name
        in return types and parameter types.
        (dynamic_bitset::_M_Nb): Add default member initializer.
        (dynamic_bitset(), dynamic_bitset(const dynamic_bitset&)): Define as
        defaulted.
        (dynamic_bitset(dynamic_bitset&&)): Clear source object after move.
        (dynamic_bitset::operator=(const dynamic_bitset&)): Define as
        defaulted.
        (dynamic_bitset::operator=(dynamic_bitset&&)): Add noexcept-specifier.
        Define without using swap, to propagate allocator correctly.
        (dynamic_bitset(const char*, const _Alloc&)): Use strlen.
        (dynamic_bitset::_M_do_sanitize, dynamic_bitset::_M_do_fill): Use
        casts to avoid unwanted integer promotions.
        (dynamic_bitset::_M_copy_from_ptr): Rearrange template parameters and
        add default template arguments and default argument to simplify usage.
        (dynamic_bitset::_M_copy_from_string): Adjust call to _M_copy_from_ptr.
        (operator==(const dynamic_bitset&, const dynamic_bitset&))
        (operator<(const dynamic_bitset&, const dynamic_bitset&)): Use _M_Nb.
        * include/tr2/dynamic_bitset.tcc (dynamic_bitset::_M_copy_from_ptr):
        Adjust template parameters to match declaration.
        * testsuite/tr2/dynamic_bitset/cmp.cc: New test.
        * testsuite/tr2/dynamic_bitset/cons.cc: New test.
        * testsuite/tr2/dynamic_bitset/copy.cc: New test.
        * testsuite/tr2/dynamic_bitset/move.cc: New test.
        * testsuite/tr2/dynamic_bitset/pr92059.cc: New test.

        * include/bits/charconv.h (__to_chars_len): Avoid -Wsign-compare
        warnings.

2019-10-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91057
        * src/c++98/locale.cc [_GLIBCXX_LONG_DOUBLE_COMPAT]
        (find_ldbl_sync_facet): Fix parameter type and missing return.

2019-10-09  Marek Polacek  <polacek@redhat.com>

        PR c++/91364 - P0388R4: Permit conversions to arrays of unknown bound.
        PR c++/69531 - DR 1307: Differently bounded array parameters.
        PR c++/88128 - DR 330: Qual convs and pointers to arrays of pointers.
        * testsuite/23_containers/span/lwg3255.cc: Adjust test to match the
        post-P0388R4 behavior.

2019-10-09  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91057
        * src/c++98/locale.cc (locale::id::_M_id()) [__GTHREADS]: Use atomic
        compare-exchange or double-checked lock to ensure only one thread sets
        the _M_index variable.
        [_GLIBCXX_LONG_DOUBLE_COMPAT]: Call find_ldbl_sync_facet to detect
        facets that share another facet's ID.
        [_GLIBCXX_LONG_DOUBLE_COMPAT] (find_ldbl_sync_facet): New function.

        PR libstdc++/78552
        * src/c++98/locale_init.cc (locale::classic()): Do not construct a new
        locale object for every call.
        (locale::_S_initialize_once()): Construct C locale here.

2019-10-08  Jonathan Wakely  <jwakely@redhat.com>

        * doc/Makefile.am (doc-html-docbook-regenerate): New target.
        (${docbook_outdir}/html): Do not create unused 'html/ext' directory.
        * doc/Makefile.in: Regenerate.
        * doc/xml/manual/documentation_hacking.xml: Document new target.
        * doc/html/*: Regenerate.

        * doc/xml/manual/allocator.xml: Use archived copy of CUJ article.
        * doc/html/*: Regenerate.

2019-10-06  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_algo.h
        (__copy_n_a(_IIte, _Size, _OIte)): New.
        (__copy_n_a(istreambuf_iterator<>, _Size, _CharT*)): New declaration.
        (__copy_n(_IIte, _Size, _OIte, input_iterator_tag)): Adapt to use
        latter.
        * include/bits/streambuf_iterator.h (istreambuf_iterator<>): Declare
        std::__copy_n_a friend.
        (__copy_n_a(istreambuf_iterator<>, _Size, _CharT*)): New.
        * testsuite/25_algorithms/copy_n/istreambuf_iterator/1.cc: New.
        * testsuite/25_algorithms/copy_n/istreambuf_iterator/1_neg.cc: New.
        * testsuite/25_algorithms/copy_n/istreambuf_iterator/2_neg.cc: New.

        * include/bits/stl_iterator_base_types.h (__iterator_category_t): Define
        for C++11.
        (_RequireInputIte): Likewise and use __enable_if_t.
        * include/std/numeric
        (__is_random_access_iter): Use __iterator_category_t.

        * include/bits/stl_algo.h (copy_n): Add __glibcxx_requires_can_increment
        debug checks.
        * testsuite/25_algorithms/copy_n/debug/1_neg.cc: New.
        * testsuite/25_algorithms/copy_n/debug/2_neg.cc: New.

2019-10-04  François Dumont  <fdumont@gcc.gnu.org>

        * include/debug/forward_list
        (_Sequence_traits<__debug::forward_list<>>::_S_size): Returns __dp_sign
        distance when not empty.
        * include/debug/list (_Sequence_traits<__debug::list<>>::_S_size):
        Likewise.
        * include/debug/helper_functions.h (__dp_sign_max_size): New
        _Distance_precision enum entry.
        (__valid_range_aux(_IIte, _IIte, _Distance_traits<>::__type,
        __false_type)): Adapt.
        * include/debug/safe_iterator.tcc
        (_Safe_iterator<>::_M_get_distance_to(const _Safe_iterator&)): Review
        distance computation.

2019-10-04  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/81091
        PR libstdc++/91947
        * configure.ac: Use AC_SYS_LARGEFILE to enable 64-bit file APIs.
        * config.h.in: Regenerate:
        * configure: Regenerate:
        * include/Makefile.am (${host_builddir}/largefile-config.h): New
        target to generate config header for filesystem library.
        (${host_builddir}/c++config.h): Rename macros for large file support.
        * include/Makefile.in: Regenerate.
        * src/c++17/fs_dir.cc: Include new config header.
        * src/c++17/fs_ops.cc: Likewise.
        (filesystem::file_size): Use uintmax_t for size.
        * src/filesystem/dir.cc: Include new config header.
        * src/filesystem/ops.cc: Likewise.
        (experimental::filesystem::file_size): Use uintmax_t for size.

        * testsuite/util/testsuite_abi.h: Use std::unordered_map instead of
        std::tr1::unordered_map.
        * testsuite/util/testsuite_allocator.h: Likewise.

        * include/tr1/hashtable.h: Add header for __gnu_cxx::__alloc_traits.

        * include/tr1/hashtable.h (tr1::_Hashtable::_M_allocate_node): Use
        __gnu_cxx::__alloc_traits for allocator construct function.
        (tr1::_Hashtable::_M_deallocate_node): Likewise for destroy function.

        * include/precompiled/stdc++.h: Include <span> for C++20.
        * testsuite/17_intro/names.cc: Do not define 'e' for C++20.

2019-10-03  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        * include/parallel/multiway_merge.h (_RAIter3): Replace _C by _Cp.

2019-10-02  Jonathan Wakely  <jwakely@redhat.com>

        * config/abi/pre/gnu.ver: Tighten up greedy wildcards.

        * doc/xml/manual/parallel_mode.xml: Add caveat about support for
        recent standards.
        * doc/html/*: Regenerate.

2019-10-01  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/algorithm (experimental::sample): Qualify call
        to __sample correctly.
        * include/parallel/algo.h (sample, for_each_n): Add using-declarations
        for algorithms that don't have parallel implementations.

        * include/parallel/algobase.h (equal, lexicographical_compare): Add
        _GLIBCXX20_CONSTEXPR and dispatch to sequential algorithm when being
        constant evaluated.
        * include/parallel/algorithmfwd.h (equal, lexicographical_compare):
        Add _GLIBCXX20_CONSTEXPR.

        * testsuite/17_intro/using_namespace_std_tr1_neg.cc: Skip test for
        parallel mode.
        * testsuite/20_util/hash/84998.cc: Likewise.
        * testsuite/23_containers/deque/types/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/forward_list/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/list/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/map/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/multimap/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/multiset/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/set/pmr_typedefs_debug.cc: Likewise.
        * testsuite/23_containers/unordered_map/pmr_typedefs_debug.cc:
        Likewise.
        * testsuite/23_containers/unordered_multimap/pmr_typedefs_debug.cc:
        Likewise.
        * testsuite/23_containers/unordered_multiset/pmr_typedefs_debug.cc:
        Likewise.
        * testsuite/23_containers/unordered_set/pmr_typedefs_debug.cc:
        Likewise.
        * testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
        Likewise.
        * testsuite/23_containers/vector/types/pmr_typedefs_debug.cc: Likewise.
        * testsuite/25_algorithms/binary_search/partitioned.cc: Likewise.
        * testsuite/25_algorithms/copy/86658.cc: Likewise.
        * testsuite/25_algorithms/equal_range/partitioned.cc: Likewise.
        * testsuite/25_algorithms/lexicographical_compare/71545.cc: Likewise.
        * testsuite/25_algorithms/lower_bound/partitioned.cc: Likewise.
        * testsuite/25_algorithms/upper_bound/partitioned.cc: Likewise.

        * include/parallel/algo.h: Replace non-reserved names.
        * include/parallel/multiway_merge.h: Likewise.
        * include/parallel/multiway_mergesort.h: Likewise.
        * include/parallel/numericfwd.h: Likewise.
        * testsuite/17_intro/names.cc: Add RAI to test macros.

2019-09-30  François Dumont  <fdumont@gcc.gnu.org>

        * include/debug/array: Add C++20 constexpr to comparison operators.
        * testsuite/23_containers/array/tuple_interface/get_debug_neg.cc: Adapt
        dg-error line numbers.
        * testsuite/23_containers/array/tuple_interface/
        tuple_element_debug_neg.cc: Likewise.

2019-09-30  Andreas Tobler  <andreast@gcc.gnu.org>

        * include/experimental/internet: Include netinet/in.h if we have
        _GLIBCXX_HAVE_NETINET_IN_H defined.

        * testsuite/ext/special_functions/airy_ai/check_nan.cc: Ignore the
        FreeBSD warning about lower advertised precision of tgammal.
        * testsuite/ext/special_functions/airy_bi/check_nan.cc: Likewise.
        * testsuite/special_functions/07_cyl_bessel_i/check_nan.cc: Likewise.
        * testsuite/special_functions/08_cyl_bessel_j/check_nan.cc: Likewise.
        * testsuite/special_functions/09_cyl_bessel_k/check_nan.cc: Likewise.
        * testsuite/special_functions/10_cyl_neumann/check_nan.cc: Likewise.
        * testsuite/special_functions/19_sph_bessel/check_nan.cc: Likewise.
        * testsuite/special_functions/21_sph_neumann/check_nan.cc: Likewise.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        08_cyl_bessel_i/check_nan.cc: Likewise.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        09_cyl_bessel_j/check_nan.cc: Likewise.
        * testuite/tr1/5_numerical_facilities/special_functions/
        10_cyl_bessel_k/check_nan.cc: Likewise.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        11_cyl_neumann/check_nan.cc: Likewise.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        21_sph_bessel/check_nan.cc: Likewise.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        23_sph_neumann/check_nan.cc: Likewise.

2019-09-30  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/span (span(element_type(&)[N]))
        (span(array<value_type, N>&), span(const array<value_type, N>&)):
        Deduce array element type to allow safe const conversions (LWG 3255).
        [!_GLIBCXX_P1394] (span(Container&), span(const Container&)): Use
        remove_cv_t on arguments to __is_std_span and __is_std_array.
        * testsuite/23_containers/span/lwg3255.cc: New test.

        PR libstdc++/77936
        * include/parallel/checkers.h (__is_sorted): Remove unused variable.

2019-09-28  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_algo.h (merge): Fix documentation.
        * include/debug/functions.h (__check_sorted_aux): Add C++20 constexpr.
        (__check_sorted): Likewise and remove nested irreflexive check.
        (__check_sorted_set_aux, __check_sorted_set): Add C++20 constexpr.
        (__check_partitioned_lower, __check_partitioned_upper): Likewise.
        (_Irreflexive_checker::_S_is_valid): Likewise.
        (__is_irreflexive, __is_irreflexive_pred): Likewise.
        * include/debug/helper_functions.h (__get_distance): Add constexpr.
        (__valid_range_aux): Add C++20 constexpr.
        (__valid_range(_Iter, _Iter, _Distance_traits<_Iter>::__type&)):
        Likewise and add std::is_constant_evaluated check.
        (__valid_range_aux(_Iter, _Iter, std::input_iterator_tag)): New.
        (__valid_range_aux(_Iter, _Iter, std::random_accss_iterator_tag)): New.
        (__valid_range_aux(_Integral, _Integral, std::__true_type)): New,
        use latter.
        (__valid_range(_Iter, _Iter)): Adapt to use latter, add constexpr and
        __builtin_is_contant_evaludated check..
        (__can_advance, __base): Add constexpr.
        * include/debug/macros.h [_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED]
        (_GLIBCXX_DEBUG_VERIFY_COND_AT): New.
        (__glibcxx_check_sorted): Use __glibcxx_check_irreflexive.
        (__glibcxx_check_sorted_pred): Use __glibcxx_check_irreflexive_pred.
        * testsuite/25_algorithms/binary_search/constexpr.cc: Use irreflexive
        std::less.
        * testsuite/25_algorithms/is_sorted/constexpr.cc: Likewise.
        * testsuite/25_algorithms/merge/constexpr.cc: Fix order in camm. Fix
        lambda to be irreflexive.

2019-09-27  Maciej W. Rozycki  <macro@wdc.com>

        * configure: Regenerate.

2019-09-27  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91910
        * src/c++11/debug.cc (_Safe_iterator_base::_M_detach()): Load pointer
        atomically and lock the mutex before accessing the sequence.
        (_Safe_local_iterator_base::_M_detach()): Likewise.
        (_Safe_iterator_base::_M_reset()): Clear _M_sequence atomically.

2019-09-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/debug/array (to_array): Define for debug mode.

        * include/bits/stl_pair.h (pair): Add _GLIBCXX20_CONSTEXPR to
        piecewise construction constructor, assignment operators, and swap.
        * include/std/tuple (pair::pair(piecewise_construct_t, tuple, tuple)):
        Add _GLIBCXX20_CONSTEXPR.
        (pair::pair(tuple, tuple, _Index_tuple, _Index_tuple)): Likewise.
        * testsuite/20_util/pair/constexpr_assign.cc: New test.
        * testsuite/20_util/pair/constexpr_swap.cc: New test.

        * include/experimental/internet (operator==, operator<): Fix loop
        condition to avoid reading past the end of the array.

        * include/std/array: Remove references to profile mode.
        * include/std/bitset: Likewise.
        * include/std/deque: Likewise.
        * include/std/forward_list: Likewise.
        * include/std/list: Likewise.
        * include/std/map: Likewise.
        * include/std/set: Likewise.
        * include/std/unordered_map: Likewise.
        * include/std/unordered_set: Likewise.
        * include/std/vector: Likewise.
        * testsuite/17_intro/headers/c++1998/profile_mode.cc: New test.
        * testsuite/17_intro/headers/c++2011/profile_mode.cc: New test.

2019-09-25  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/regex.h
        (basic_regex::assign(const C*, size_t, flag_type)): Add default
        argument (LWG 3296).
        * testsuite/28_regex/basic_regex/assign/char/lwg3296.cc: New test.
        * testsuite/28_regex/basic_regex/assign/wchar_t/lwg3296.cc: New test.

2019-09-24  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/variant (variant::index()): Remove impossible case.

        PR libstdc++/91871
        * testsuite/util/testsuite_hooks.h
        (conversion::iterator_to_const_iterator()): Do not return an invalid
        iterator. Test direct-initialization and direct-list-initialization
        as well as implicit conversion.

2019-09-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91788 (partial)
        * include/std/variant (variant::index()): Improve codegen for cases
        where conversion to size_t already works correctly.

2019-09-23  Andreas Schwab  <schwab@suse.de>

        * config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2019-09-12  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91748
        * include/bits/stl_algo.h (for_each_n): Fix random access iterator
        case.
        * testsuite/25_algorithms/for_each/for_each_n.cc: Test with random
        access iterators.

2019-09-11  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/xmethods.py (SharedPtrUseCountWorker.__call__):
        Fix syntax error.

        * testsuite/20_util/result_of/sfinae_friendly_1.cc: Add -Wno-volatile
        for C++2a and up. Define HAS_52748_FIXED and fix incorrect tests.
        * testsuite/tr1/3_function_objects/result_of.cc: Add -Wno-volatile
        for C++2a and up.

2019-09-10  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/type_traits (__do_common_type_impl): Implement
        additional COND-RES(CREF(D1), CRED(D2)) condition for C++20.
        (basic_common_reference, common_reference, common_reference_t): Define
        for C++20.
        * testsuite/20_util/common_reference/requirements/alias_decl.cc: New
        test.
        * testsuite/20_util/common_reference/requirements/
        explicit_instantiation.cc: New test.
        * testsuite/20_util/common_reference/requirements/typedefs.cc: New
        test.

        * include/std/charconv (to_chars): Rename to __to_chars_i. Define
        non-template overloads for each signed and unsigned integer type and
        char. Define deleted overload for bool (LWG 3266).
        * testsuite/20_util/to_chars/1_neg.cc: Remove.
        * testsuite/20_util/to_chars/3.cc: New test.
        * testsuite/20_util/to_chars/lwg3266.cc: New test.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

        * acinclude.m4: Handle uclinux*.
        * configure: Regenerate.
        * configure.host: Handle uclinux*

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>
        Mickaël Guêné <mickael.guene@st.com>

        * libsupc++/eh_personality.cc (get_ttype_entry): Add FDPIC
        support.

2019-09-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91711
        * testsuite/23_containers/span/get_neg.cc: Avoid ambiguity due to
        0ul being a valid null pointer constant.

        * include/std/type_traits (__remove_cv_t): New alias template.
        (is_void, is_integral, is_floating_point, is_pointer)
        (is_member_object_pointer, is_member_function_pointer, is_null_pointer)
        (is_member_point), __is_signed_integer, __is_unsigned_integer)
        (__make_unsigned_selector, __make_signed_selector, remove_pointer)
        (__decay_selector): Use __remove_cv_t.
        (remove_cv): Add partial specializations for cv-qualified types.
        (__decay_t): New alias template.
        (__decay_and_strip, __common_type_impl, __result_of_impl): Use
        __decay_t.
        (__enable_if_t): Move earlier in the file.
        (_Require): Use __enable_if_t.
        (swap(T&, T&)): Use _Require.
        (swap(T(&)[N])): Use __enable_if_t.

2019-09-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

        Implement C++20 p1424 - 'constexpr' feature macro concerns,
        Issue 3256 - Feature testing macro for constexpr algorithms,
        and Issue 3257 - Missing feature testing macro update from P0858.
        * include/std/version (__cpp_lib_constexpr_algorithms): Bump value.
        * include/bits/algorithmfwd.h: Ditto.
        * include/std/utility: Ditto.
        * testsuite/25_algorithms/constexpr_macro.cc: Ditto.
        * testsuite/25_algorithms/cpp_lib_constexpr.cc: New check for
        __cpp_lib_constexpr macro in <algorith>.
        * testsuite/20_util/exchange/constexpr.cc: Add check for
        __cpp_lib_constexpr macro in <utility>.
        * testsuite/25_algorithms/adjacent_find/constexpr.cc: Remove check for
        __cpp_lib_constexpr_algorithms.
        * testsuite/25_algorithms/all_of/constexpr.cc: Ditto.
        * testsuite/25_algorithms/any_of/constexpr.cc: Ditto.
        * testsuite/25_algorithms/binary_search/constexpr.cc: Ditto.
        * testsuite/25_algorithms/copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/copy_backward/constexpr.cc: Ditto.
        * testsuite/25_algorithms/copy_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/copy_n/constexpr.cc: Ditto.
        * testsuite/25_algorithms/count/constexpr.cc: Ditto.
        * testsuite/25_algorithms/count_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/equal/constexpr.cc: Ditto.
        * testsuite/25_algorithms/equal_range/constexpr.cc: Ditto.
        * testsuite/25_algorithms/fill/constexpr.cc: Ditto.
        * testsuite/25_algorithms/fill_n/constexpr.cc: Ditto.
        * testsuite/25_algorithms/find/constexpr.cc: Ditto.
        * testsuite/25_algorithms/find_end/constexpr.cc: Ditto.
        * testsuite/25_algorithms/find_first_of/constexpr.cc: Ditto.
        * testsuite/25_algorithms/find_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/find_if_not/constexpr.cc: Ditto.
        * testsuite/25_algorithms/for_each/constexpr.cc: Ditto.
        * testsuite/25_algorithms/generate/constexpr.cc: Ditto.
        * testsuite/25_algorithms/generate_n/constexpr.cc: Ditto.
        * testsuite/25_algorithms/is_heap/constexpr.cc: Ditto.
        * testsuite/25_algorithms/is_heap_until/constexpr.cc: Ditto.
        * testsuite/25_algorithms/is_partitioned/constexpr.cc: Ditto.
        * testsuite/25_algorithms/is_permutation/constexpr.cc: Ditto.
        * testsuite/25_algorithms/is_sorted/constexpr.cc: Ditto.
        * testsuite/25_algorithms/is_sorted_until/constexpr.cc: Ditto.
        * testsuite/25_algorithms/lexicographical_compare/constexpr.cc: Ditto.
        * testsuite/25_algorithms/lower_bound/constexpr.cc: Ditto.
        * testsuite/25_algorithms/merge/constexpr.cc: Ditto.
        * testsuite/25_algorithms/mismatch/constexpr.cc: Ditto.
        * testsuite/25_algorithms/none_of/constexpr.cc: Ditto.
        * testsuite/25_algorithms/partition_copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/partition_point/constexpr.cc: Ditto.
        * testsuite/25_algorithms/remove/constexpr.cc: Ditto.
        * testsuite/25_algorithms/remove_copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/remove_copy_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/remove_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/replace_copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/replace_copy_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/replace_if/constexpr.cc: Ditto.
        * testsuite/25_algorithms/reverse_copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/rotate_copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/search/constexpr.cc: Ditto.
        * testsuite/25_algorithms/search_n/constexpr.cc: Ditto.
        * testsuite/25_algorithms/set_difference/constexpr.cc: Ditto.
        * testsuite/25_algorithms/set_intersection/constexpr.cc: Ditto.
        * testsuite/25_algorithms/set_symmetric_difference/constexpr.cc: Ditto.
        * testsuite/25_algorithms/set_union/constexpr.cc: Ditto.
        * testsuite/25_algorithms/transform/constexpr.cc: Ditto.
        * testsuite/25_algorithms/unique/constexpr.cc: Ditto.
        * testsuite/25_algorithms/unique_copy/constexpr.cc: Ditto.
        * testsuite/25_algorithms/upper_bound/constexpr.cc: Ditto.

2019-09-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

        Update docs for recent <span> and constexpr lib changes.
        * doc/xml/manual/status_cxx2020.xml: Update p0202r3, p0858r0, p0879r0,
        p1023r0, p1085r2 status.
        * doc/html/manual/status.html: Regenerate.

2019-09-09  Antony Polukhin  <antoshkka@gmail.com>

        * include/bits/charconv.h (__detail::__to_chars_10_impl): Replace
        final offsets with constants.

2019-09-09  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/range_access.h (__adl_to_address): Remove.
        * include/std/span (__is_base_derived_safe_convertible_v): Replace
        with span::__is_compatible.
        (__is_std_array_v): Replace with __is_std_array class template and
        partial specializations.
        (__is_std_array, __is_std_span): New class templates and partial
        specializations.
        (span::__is_compatible): New alias template for SFINAE constraints.
        (span::span(element_type (&)[N])): Remove redundant constraints. Do
        not use __adl_data to obtain a pointer.
        (span::span(array<value_type, N>&)): Likewise.
        (span::span(const array<value_type, N>&)): Likewise.
        [_GLIBCXX_P1394] (span::iter_reference_t, span::iterator_t)
        (span::iter_value_t, span::derived_from): New alias templates for
        SFINAE constraints, until the equivalents are supported in <concepts>
        and <iterator>.
        [_GLIBCXX_P1394] (span::__is_compatible_iterator): New alias template
        for SFINAE constraints.
        [_GLIBCXX_P1394] (span::is_compatible_range): New class template for
        SFINAE constraints.
        [_GLIBCXX_P1394] (span::span(Range&&)): Improve constraints.
        [_GLIBCXX_P1394] (span::span(ContiguousIterator, Sentinel)): Likewise.
        Use std::to_address instead of __adl_to_address.
        [_GLIBCXX_P1394] (span::span(ContiguousIterator, size_type)): Likewise.
        [!_GLIBCXX_P1394] (span::__is_compatible_container): New alias
        template for SFINAE constraints.
        [!_GLIBCXX_P1394] (span::span(Container&))
        (span::span(const Container&)): Improve constraints.
        [!_GLIBCXX_P1394] (span::span(pointer, size_type))
        (span::span(pointer, pointer)): Remove redundant cast of pointer.
        (span(const span<OType, OExtent>&)): New constructor.

2019-09-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/range_access.h (ssize): Define for C++20.
        * testsuite/24_iterators/range_access_cpp20.cc: New test.
        * doc/xml/manual/status_cxx2020.xml: Update P1227R2 status.
        * doc/html/*: Regenerate.

2019-09-06  Florian Weimer  <fweimer@redhat.com>

        * configure: Regenerate.

2019-09-05  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2020.xml: Update status for P0122R7 and
        P1024R3. Remove entry for P0920R2.
        * include/std/span  (__cpp_lib_span): Change value.
        (__extent_storage, __extent_storage<dynamic_extent>): Remove default
        constructor.
        (span): Replace __extent_storage base class with data member.
        (span::_S_subspan_extent): New function.
        (span::empty()): Add nodiscard attribute.
        (span::front, span::back, span::operator[]): Check preconditions.
        (span::first, span::last, span::subspan): Add noexcept. Improve
        precondition checks (LWG 3103).
        (get): Remove redundant condition from static_assert.
        (tuple_element<I, span<T, E>>): Fix static_assert message and simplify.
        (as_writable_bytes): Add inline specifier.
        * include/std/version (__cpp_lib_span): Change value.
        * testsuite/23_containers/span/back_neg.cc: Remove stray semi-colon.
        * testsuite/23_containers/span/front_neg.cc: Likewise.
        * testsuite/23_containers/span/index_op_neg.cc: Likewise.
        * testsuite/23_containers/span/last_neg.cc: Improve test.
        * testsuite/23_containers/span/subspan_neg.cc: Likewise.
        * testsuite/23_containers/span/1.cc: New test.
        * testsuite/23_containers/span/2.cc: New test.
        * testsuite/23_containers/span/back_assert_neg.cc: New test.
        * testsuite/23_containers/span/first_2_assert_neg.cc: New test.
        * testsuite/23_containers/span/first_assert_neg.cc: New test.
        * testsuite/23_containers/span/first_neg.cc: New test.
        * testsuite/23_containers/span/front_assert_neg.cc: New test.
        * testsuite/23_containers/span/index_op_assert_neg.cc: New test.
        * testsuite/23_containers/span/last_2_assert_neg.cc: New test.
        * testsuite/23_containers/span/last_assert_neg.cc: New test.
        * testsuite/23_containers/span/subspan_2_assert_neg.cc: New test.
        * testsuite/23_containers/span/subspan_3_assert_neg.cc: New test.
        * testsuite/23_containers/span/subspan_4_assert_neg.cc: New test.
        * testsuite/23_containers/span/subspan_5_assert_neg.cc: New test.
        * testsuite/23_containers/span/subspan_6_assert_neg.cc: New test.
        * testsuite/23_containers/span/subspan_assert_neg.cc: New test.

2019-09-05  JeanHeyd Meneide  <phdofthehouse@gmail.com>

        * include/Makefile.am: Add <span> header.
        * include/Makefile.in: Regenerate.
        * include/bits/range_access.h (__adl_begin, __adl_end, __adl_cbegin)
        (__adl_cend, __adl_rbegin, __adl_rend, __adl_crbegin, __adl_crend)
        (__adl_data, __adl_cdata, __adl_size, __adl_empty, __adl_to_address):
        New functions for performing argument-dependent lookup of range
        customization points.
        * include/bits/stl_iterator.h (__normal_iterator): Add
        _GLIBCXX20_CONSTEXPR to all functions.
        * include/std/span: New header.
        * include/std/version (__cpp_lib_span): Define feature test macro.
        * testsuite/23_containers/span/contiguous_range_neg.cc: New test.
        * testsuite/23_containers/span/everything.cc: New test.
        * testsuite/23_containers/span/get_neg.cc: New test.
        * testsuite/23_containers/span/last_neg.cc: New test.
        * testsuite/23_containers/span/subspan_neg.cc: New test.
        * testsuite/23_containers/span/tuple_element_dynamic_neg.cc: New test.
        * testsuite/23_containers/span/tuple_element_oob_neg.cc: New test.
        * testsuite/23_containers/span/tuple_size_neg.cc: New test.

2019-09-05  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/allocator.xml: Remove URL for bibliography entry.
        * doc/html/*: Regenerate.

2019-09-04  Mike Crowe  <mac@mcrowe.com>

        PR libstdc++/41861
        * acinclude.m4 (GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT): Check for new
        pthread_cond_clockwait function.
        * configure.ac: Use GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT.
        * configure: Regenerate.
        * config.h.in: Regenerate.
        * include/std/condition_variable: (condition_variable): Rename
        __steady_clock_t typedef and add system_clock. Change __clock_t to be
        a typedef for the preferred clock to convert arbitrary other clocks to.
        [_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT] (wait_until): Add a steady_clock
        overload.
        (wait_until): Change __clock_t overload to use system_clock.
        [_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT] (__wait_until_impl): Add
        steady_clock overload that calls pthread_cond_clockwait.
        (__wait_until_impl): Change __clock_t overload to use system_clock.
        (condition_variable_any) [_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT]: Use
        steady_clock for __clock_t if pthread_cond_clockwait is available.

2019-09-04  Mike Crowe  <mac@mcrowe.com>

        * testsuite/30_threads/condition_variable/members/2.cc (test01):
        Parameterise so that test can be run against an arbitrary clock.
        (main): Test using std::chrono::steady_clock and a user-defined
        clock in addition to the previous std::chrono::system_clock.
        * testsuite/30_threads/condition_variable_any/members/2.cc: Likewise.

2019-09-03  Ulrich Weigand  <uweigand@de.ibm.com>

        * crossconfig.m4: Remove references to spu.
        * configure: Regenerate.
        * doc/xml/manual/appendix_contributing.xml: Remove references
        to __ea as "badword" for spu.
        * doc/html/manual/source_code_style.html: Regenerate.
        * include/tr1/ell_integral.tcc (__ellint_rd): Do not attempt
        to avoid __ea (as "badword" for spu).
        (__ellint_rj): Likewise.

2019-09-03  Chung-Lin Tang  <cltang@codesourcery.com>

        PR other/79543
        * acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Fix GNU ld --version
        scanning to conform to the GNU Coding Standards.
        * configure: Regenerate.

2019-09-02  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/memory_resource.cc: Use __constinit keyword.

2019-09-02  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/abi.xml: Document 9.x library versions.
        * doc/html/*: Regenerate.

2019-09-02  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/charconv (__detail::__to_chars_2_len): Use std::log2p1.
        (__detail::__to_chars_8_len): Remove.
        (__detail::__to_chars_8): Inline length calculation here.
        (__detail::__from_chars_binary): Use numeric_limits instead of
        CHAR_BIT.

2019-09-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        * config/abi/post/i386-solaris/baseline_symbols.txt: Regenerate.
        * config/abi/post/i386-solaris/amd64/baseline_symbols.txt: Likewise.
        * config/abi/post/sparc-solaris/baseline_symbols.txt: Likewise.
        * config/abi/post/sparc-solaris/sparcv9/baseline_symbols.txt:
        Likewise.

2019-09-01  François Dumont  <fdumont@gcc.gnu.org>

        * testsuite_files/util/testsuite_performance.h
        (resource_counter::start): Ignore unused malloc(0) result.

2019-09-01  Gerald Pfeifer  <gerald@pfeifer.com>

        * doc/xml/manual/policy_data_structures_biblio.xml (COM: Component
        Model Object Technologies): Adjust name and link.

2019-08-30  Antony Polukhin  <antoshkka@gmail.com>

        * include/std/charconv (__detail::__to_chars_8)
        __detail::__to_chars_16): Replace array of precomputed digits with
        arithmetic operations to avoid CPU cache misses. Remove zero
        termination from array of digits to allow symbol merge with generic
        implementation of __detail::__to_chars. Replace final offsets with
        constants. Use __detail::__to_chars_len_2 instead of a generic
        __detail::__to_chars_len.
        (__detail::__to_chars): Remove zero termination from array of digits.
        (__detail::__to_chars_2): Leading digit is always '1'.

2019-08-30  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/23_containers/vector/cons/89164_c++17.cc: Fix errors.

2019-08-30  Uros Bizjak  <ubizjak@gmail.com>

        * config/abi/post/alpha-linux-gnu/baseline_symbols.txt: Update.

2019-08-30  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89164
        * include/bits/stl_algobase.h (__copy_move): Give descriptive names
        to template parameters.
        * include/bits/stl_uninitialized.h (uninitialized_copy)
        (uninitialized_fill, uninitialized_fill_n): Add static assertions to
        diagnose invalid uses.
        * testsuite/20_util/specialized_algorithms/uninitialized_copy/1.cc:
        Adjust expected error.
        * testsuite/20_util/specialized_algorithms/uninitialized_copy/89164.cc:
        New test.
        * testsuite/20_util/specialized_algorithms/uninitialized_copy_n/
        89164.cc: New test.
        * testsuite/20_util/specialized_algorithms/uninitialized_fill/89164.cc:
        New test.
        * testsuite/20_util/specialized_algorithms/uninitialized_fill_n/
        89164.cc: New test.
        * testsuite/23_containers/vector/cons/89164.cc: New test.
        * testsuite/23_containers/vector/cons/89164_c++17.cc: New test.

2019-08-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91067
        * acinclude.m4 (libtool_VERSION): Bump to 6:28:0.
        * configure: Regenerate.
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.28): Add new version. Export
        missing symbols.
        * testsuite/27_io/filesystem/iterators/91067.cc: Test move
        constructors.
        * testsuite/util/testsuite_abi.cc: Add new symbol version.

2019-08-29  Jakub Jelinek  <jakub@redhat.com>

        * config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Update.

2019-08-28  Jonathan Wakely  <jwakely@redhat.com>

        * config/abi/post/i386-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/i486-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/powerpc-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt: Update.
        * config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/x86_64-linux-gnu/32/baseline_symbols.txt: Update.
        * config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Update.

2019-08-23  Joseph Myers  <joseph@codesourcery.com>

        * src/filesystem/ops-common.h [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
        (std::filesystem::__gnu_posix::lstat): Add return type.

2019-08-20  Jonathan Wakely  <jwakely@redhat.com>

        * doc/doxygen/user.cfg.in (INPUT): Remove profile mode headers.

        * include/std/numeric (reduce): Fix Doxygen markup.

        PR libstdc++/91371
        * include/std/type_traits (is_function): Simplify definition. Remove
        partial specializations for function types.
        (__is_referenceable): Simplify definition.
        * testsuite/20_util/bind/91371.cc: New test.
        * testsuite/20_util/is_function/91371.cc: New test.
        * testsuite/20_util/is_function/value.cc: Check more pointer types.
        * testsuite/20_util/is_member_function_pointer/91371.cc: New test.
        * testsuite/20_util/is_object/91371.cc: New test.

2019-08-16  Uros Bizjak  <ubizjak@gmail.com>

        * config/abi/post/alpha-linux-gnu/baseline_symbols.txt: Update.

2019-08-15  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91456
        * include/bits/std_function.h (__check_func_return_type): Remove.
        (function::_Callable): Use std::__is_invocable_impl instead of
        __check_func_return_type.
        * include/std/type_traits (__is_invocable_impl): Add another defaulted
        template parameter. Define a separate partial specialization for
        INVOKE and INVOKE<void>. For INVOKE<R> replace is_convertible check
        with a check that models delayed temporary materialization.
        * testsuite/20_util/function/91456.cc: New test.
        * testsuite/20_util/is_invocable/91456.cc: New test.

2019-08-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/type_traits (__is_nullptr_t): Add deprecated attribute.

2019-08-14  Edward Smith-Rowland  <3dw4rd@verizon.net>

        Implement C++20 p0879 - Constexpr for swap and swap related functions.
        * include/std/version (__cpp_lib_constexpr_swap_algorithms): New macro.
        * include/bits/algorithmfwd.h (__cpp_lib_constexpr_swap_algorithms):
        New macro.
        (iter_swap, make_heap, next_permutation, partial_sort_copy, pop_heap)
        (prev_permutation, push_heap, reverse, rotate, sort_heap, swap)
        (swap_ranges, nth_element, partial_sort, sort): Add constexpr.
        * include/bits/move.h (swap): Add constexpr.
        * include/bits/stl_algo.h (__move_median_to_first, __reverse, reverse)
        (__gcd, __rotate, rotate, __partition, __heap_select)
        (__partial_sort_copy, partial_sort_copy, __unguarded_partition)
        (__unguarded_partition_pivot, __partial_sort, __introsort_loop, __sort)
        (__introselect, __chunk_insertion_sort, next_permutation)
        (prev_permutation, partition, partial_sort, nth_element, sort)
        (__iter_swap::iter_swap, iter_swap, swap_ranges): Add constexpr.
        * include/bits/stl_algobase.h (__iter_swap::iter_swap, iter_swap)
        (swap_ranges): Add constexpr.
        * include/bits/stl_heap.h (__push_heap, push_heap, __adjust_heap,
        __pop_heap, pop_heap, __make_heap, make_heap, __sort_heap, sort_heap):
        Add constexpr.
        * include/std/type_traits (swap): Add constexpr.
        * testsuite/25_algorithms/headers/algorithm/synopsis.cc: Add constexpr.
        * testsuite/25_algorithms/iter_swap/constexpr.cc: New test.
        * testsuite/25_algorithms/make_heap/constexpr.cc: New test.
        * testsuite/25_algorithms/next_permutation/constexpr.cc: New test.
        * testsuite/25_algorithms/nth_element/constexpr.cc: New test.
        * testsuite/25_algorithms/partial_sort/constexpr.cc: New test.
        * testsuite/25_algorithms/partial_sort_copy/constexpr.cc: New test.
        * testsuite/25_algorithms/partition/constexpr.cc: New test.
        * testsuite/25_algorithms/pop_heap/constexpr.cc: New test.
        * testsuite/25_algorithms/prev_permutation/constexpr.cc: New test.
        * testsuite/25_algorithms/push_heap/constexpr.cc: New test.
        * testsuite/25_algorithms/reverse/constexpr.cc: New test.
        * testsuite/25_algorithms/rotate/constexpr.cc: New test.
        * testsuite/25_algorithms/sort/constexpr.cc: New test.
        * testsuite/25_algorithms/sort_heap/constexpr.cc: New test.
        * testsuite/25_algorithms/swap/constexpr.cc: New test.
        * testsuite/25_algorithms/swap_ranges/constexpr.cc: New test.

2019-08-12  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90361
        * src/c++17/string-inst.cc: Use _GLIBCXX_USE_CXX11_ABI=1 by default.

        * include/std/tuple (__unpack_std_tuple): New variable template and
        partial specializations.
        (apply, make_from_tuple): Add noexcept-specifier.
        * testsuite/20_util/tuple/apply/2.cc: New test.
        * testsuite/20_util/tuple/make_from_tuple/2.cc: New test.

2019-08-09  Corentin Gay  <gay@adacore.com>

        * testsuite/ext/random/beta_distribution/operators/serialize.cc,
        testsuite/ext/random/hypergeometric_distribution/operators/serialize.cc,
        testsuite/ext/random/normal_mv_distribution/operators/serialize.cc,
        testsuite/ext/random/triangular_distribution/operators/serialize.cc,
        testsuite/ext/random/von_mises_distribution/operators/serialize.cc:
        Add call to `VERIFY`.

2019-08-09  Alexandre Oliva <oliva@adacore.com>

        * include/ext/random
        (normal_mv_distribution::param_type::param_type): New private
        ctor taking a decomposed varcov matrix, for use by...
        (operator>>): ... this, befriended.
        * include/ext/random.tcc (operator>>): Use it.
        (normal_mv_distribution::param_type::_M_init_lower): Adjust
        member function name in exception message.

2019-08-08  Jonathan Wakely  <jwakely@redhat.com>

        P0325R4 to_array from LFTS with updates
        * include/experimental/array (to_array): Qualify call to __to_array.
        * include/std/array (__cpp_lib_to_array, to_array): Define for C++20.
        * include/std/version (__cpp_lib_to_array): Likewise.
        * testsuite/23_containers/array/creation/1.cc: New test.
        * testsuite/23_containers/array/creation/2.cc: New test.
        * testsuite/23_containers/array/creation/3_neg.cc: New test.
        * testsuite/23_containers/array/tuple_interface/tuple_element_neg.cc:
        Use zero for dg-error line number.

2019-08-06  Jonathan Wakely  <jwakely@redhat.com>

        P1651R0 bind_front should not unwrap reference_wrapper
        * include/std/functional (bind_front): Don't unwrap reference_wrapper.
        * include/std/version (__cpp_lib_bind_front): Update value.
        * testsuite/20_util/function_objects/bind_front/1.cc: Fix test for
        feature test macro.
        * testsuite/20_util/function_objects/bind_front/2.cc: New test.

        * include/std/numbers [!__STRICT_ANSI__ && _GLIBCXX_USE_FLOAT128]
        (e_v, log2e_v, log10e_v, pi_v, inv_pi_v, inv_sqrtpi_v, ln2_v, ln10_v)
        (sqrt2_v, sqrt3_v, inv_sqrt3, egamma_v, phi_v): Add explicit
        specializations for __float128.
        * testsuite/26_numerics/numbers/float128.cc: New test.

2019-08-04  Gerald Pfeifer  <gerald@pfeifer.com>

        * doc/xml/manual/documentation_hacking.xml: doxygen.org is now
        doxygen.nl.

2019-08-01  Edward Smith-Rowland  <3dw4rd@verizon.net>

        Implement C++20 p0202 - Add Constexpr Modifiers to Functions
        in <algorithm> and <utility> Headers.
        Implement C++20 p1023 - constexpr comparison operators for std::array.
        * include/bits/algorithmfwd.h (all_of, any_of, binary_search, copy,
        copy_backward, copy_if, copy_n, equal_range, fill, find_end,
        find_if_not, includes, is_heap, is_heap_until, is_partitioned,
        is_permutation, is_sorted, is_sorted_until, iter_swap, lower_bound,
        none_of, partition_copy, partition_point, remove, remove_if,
        remove_copy, remove_copy_if, replace_copy, replace_copy_if,
        reverse_copy, rotate_copy, uunique, upper_bound, adjacent_find, count,
        count_if, equal, find, find_first_of, find_if, for_each, generate,
        generate_n, lexicographical_compare, merge, mismatch, replace,
        replace_if, search, search_n, set_difference, set_intersection,
        set_symmetric_difference, set_union, transform, unique_copy):
        Mark constexpr.
        * include/bits/cpp_type_traits.h (__miter_base): Mark constexpr.
        * include/bits/predefined_ops.h (_Iter_less_val::operator(),
        _Val_less_iter::operator(), _Iter_equal_to_iter::operator(),
        _Iter_equal_to_val::operator(), _Iter_equals_val::operator()):
         Use const ref instead of ref arg;
        (_Iter_less_val, __iter_less_val, _Val_less_iter, __val_less_iter,
        __iter_equal_to_iter, __iter_equal_to_val, __iter_comp_val,
        _Iter_comp_val, _Val_comp_iter, __val_comp_iter, __iter_equals_val,
        _Iter_equals_iter, __iter_comp_iter, _Iter_pred, __pred_iter,
        _Iter_comp_to_val, __iter_comp_val, _Iter_comp_to_iter,
        __iter_comp_iter): Mark constexpr.
        * include/bits/stl_algo.h (__find_if, __find_if_not, __find_if_not_n,
        __search, __search_n_aux, __search_n, __find_end, find_end, all_of,
        none_of, any_of, find_if_not, is_partitioned, partition_point,
        __remove_copy_if, remove_copy, remove_copy_if, copy_if, __copy_n,
        copy_n, partition_copy, __remove_if, remove, remove_if, __adjacent_find,
        __unique, unique, __unique_copy, reverse_copy, rotate_copy,
        __unguarded_linear_insert, __insertion_sort, __unguarded_insertion_sort,
        __final_insertion_sort, lower_bound, __upper_bound, upper_bound,
        __equal_range, equal_range, binary_search, __includes, includes,
        __next_permutation, __prev_permutation, __replace_copy_if, replace_copy,
        replace_copy_if, __count_if, is_sorted, __is_sorted_until,
        is_sorted_until, __is_permutation, is_permutation, for_each, find,
        find_if, find_first_of, adjacent_find, count, count_if, search,
        search_n, transform, replace, replace_if, generate, generate_n,
        unique_copy, __merge, merge, __set_union, set_union, __set_intersection,
        set_intersection, __set_difference, set_difference,
        __set_symmetric_difference, set_symmetric_difference):  Mark constexpr.
        * include/bits/stl_algobase.h (__memmove, __memcmp): New maybe constexpr
        wrappers around __builtin_memmove and __builtin_memcmp
        respectively;
        (__niter_base, __niter_wrap, __copy_m, __copy_move_a, __copy_move_a2,
        copy, move, __copy_move_b, __copy_move_backward_a,
        __copy_move_backward_a2, copy_backward, move_backward, __fill_a, fill,
        __fill_n_a, fill_n, equal, __lc_rai::__newlast1, __lc_rai::__cnd2,
        __lexicographical_compare_impl, __lexicographical_compare,
        __lexicographical_compare<true>::__lc, __lexicographical_compare_aux,
        __lower_bound, lower_bound, equal, __equal4, lexicographical_compare,
        __mismatch, mismatch, __is_heap_until, __is_heap, is_heap_until,
        is_heap): Mark constexpr.
        * include/bits/stl_heap.h (__is_heap_until, __is_heap, is_heap_until,
        is_heap): Mark constexpr.
        * include/bits/stl_iterator.h (__niter_base, __miter_base): Mark constexpr.
        * include/std/array: Make comparison ops constexpr.
        * include/std/utility: Make exchange constexpr.
        * include/std/version (__cpp_lib_constexpr_algorithms): New macro.
        * testsuite/23_containers/array/tuple_interface/get_neg.cc: Adjust.
        * testsuite/23_containers/array/tuple_interface/
        tuple_element_neg.cc: Adjust.
        * testsuite/20_util/exchange/constexpr.cc: New.
        * testsuite/23_containers/array/comparison_operators/constexpr.cc: New.
        * testsuite/25_algorithms/constexpr_macro.cc: New.
        * testsuite/25_algorithms/adjacent_find/constexpr.cc: New.
        * testsuite/25_algorithms/all_of/constexpr.cc: New.
        * testsuite/25_algorithms/any_of/constexpr.cc: New.
        * testsuite/25_algorithms/binary_search/constexpr.cc: New.
        * testsuite/25_algorithms/copy/constexpr.cc: New.
        * testsuite/25_algorithms/copy_backward/constexpr.cc: New.
        * testsuite/25_algorithms/copy_if/constexpr.cc: New.
        * testsuite/25_algorithms/copy_n/constexpr.cc: New.
        * testsuite/25_algorithms/count/constexpr.cc: New.
        * testsuite/25_algorithms/count_if/constexpr.cc: New.
        * testsuite/25_algorithms/equal/constexpr.cc: New.
        * testsuite/25_algorithms/equal_range/constexpr.cc: New.
        * testsuite/25_algorithms/fill/constexpr.cc: New.
        * testsuite/25_algorithms/fill_n/constexpr.cc: New.
        * testsuite/25_algorithms/find/constexpr.cc: New.
        * testsuite/25_algorithms/find_end/constexpr.cc: New.
        * testsuite/25_algorithms/find_first_of/constexpr.cc: New.
        * testsuite/25_algorithms/find_if/constexpr.cc: New.
        * testsuite/25_algorithms/find_if_not/constexpr.cc: New.
        * testsuite/25_algorithms/for_each/constexpr.cc: New.
        * testsuite/25_algorithms/generate/constexpr.cc: New.
        * testsuite/25_algorithms/generate_n/constexpr.cc: New.
        * testsuite/25_algorithms/is_heap/constexpr.cc: New.
        * testsuite/25_algorithms/is_heap_until/constexpr.cc: New.
        * testsuite/25_algorithms/is_partitioned/constexpr.cc: New.
        * testsuite/25_algorithms/is_permutation/constexpr.cc: New.
        * testsuite/25_algorithms/is_sorted/constexpr.cc: New.
        * testsuite/25_algorithms/is_sorted_until/constexpr.cc: New.
        * testsuite/25_algorithms/lexicographical_compare/constexpr.cc: New.
        * testsuite/25_algorithms/lower_bound/constexpr.cc: New.
        * testsuite/25_algorithms/merge/constexpr.cc: New.
        * testsuite/25_algorithms/mismatch/constexpr.cc: New.
        * testsuite/25_algorithms/none_of/constexpr.cc: New.
        * testsuite/25_algorithms/partition_copy/constexpr.cc: New.
        * testsuite/25_algorithms/partition_point/constexpr.cc: New.
        * testsuite/25_algorithms/remove/constexpr.cc: New.
        * testsuite/25_algorithms/remove_copy/constexpr.cc: New.
        * testsuite/25_algorithms/remove_copy_if/constexpr.cc: New.
        * testsuite/25_algorithms/remove_if/constexpr.cc: New.
        * testsuite/25_algorithms/replace_copy/constexpr.cc: New.
        * testsuite/25_algorithms/replace_copy_if/constexpr.cc: New.
        * testsuite/25_algorithms/replace_if/constexpr.cc: New.
        * testsuite/25_algorithms/reverse_copy/constexpr.cc: New.
        * testsuite/25_algorithms/rotate_copy/constexpr.cc: New.
        * testsuite/25_algorithms/search/constexpr.cc: New.
        * testsuite/25_algorithms/search_n/constexpr.cc: New.
        * testsuite/25_algorithms/set_difference/constexpr.cc: New.
        * testsuite/25_algorithms/set_intersection/constexpr.cc: New.
        * testsuite/25_algorithms/set_symmetric_difference/constexpr.cc: New.
        * testsuite/25_algorithms/set_union/constexpr.cc: New.
        * testsuite/25_algorithms/transform/constexpr.cc: New.
        * testsuite/25_algorithms/unique/constexpr.cc: New.
        * testsuite/25_algorithms/unique_copy/constexpr.cc: New.
        * testsuite/25_algorithms/upper_bound/constexpr.cc: New.

2019-07-31  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/memory (make_obj_using_allocator): Qualify call to
        uses_allocator_construction_args.

        P0631R4 Math Constants
        * include/Makefile.am: Add new header.
        * include/Makefile.in: Regenerate.
        * include/precompiled/stdc++.h: Include new header.
        * include/std/numbers: New header.
        * include/std/version (__cpp_lib_math_constants): Define.
        * testsuite/26_numerics/numbers/1.cc: New test.
        * testsuite/26_numerics/numbers/2.cc: New test.
        * testsuite/26_numerics/numbers/3.cc: New test.
        * testsuite/26_numerics/numbers/nonfloat_neg.cc: New test.

        * include/std/bit: Add Doxygen comments.

        PR libstdc++/91308
        * include/bits/unique_ptr.h (unique_ptr::__safe_conversion_up): Remove
        constraints on deleter that should only apply to the constructor.
        (unique_ptr<T[], D>::__safe_conversion_up): Likewise.
        (unique_ptr<T[], D>::unique_ptr(unique_ptr<U, D>&&)): Restore
        constraints on deleter here.
        * testsuite/20_util/unique_ptr/assign/91308.cc: New test.

2019-07-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/51333
        * libsupc++/cxxabi.h (__gnu_cxx::recursive_init_error): Do not define
        constructor inline.
        * libsupc++/guard_error.cc (__gnu_cxx::recursive_init_error): Define
        constructor.
        * testsuite/18_support/51333.cc: New test.

2019-07-28  Gerald Pfeifer  <gerald@pfeifer.com>

        * doc/xml/manual/documentation_hacking.xml: Fix broken reference
        to the Doxygen manual. Avoid a "here" link on the way.
        Fix another broken link to Doxygen docblocks.

2019-07-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/bit (__cpp_lib_endian): Define.
        * include/std/version (__cpp_lib_endian): Define.
        * testsuite/26_numerics/endian/2.cc: New.
        * testsuite/26_numerics/endian/3.cc: New.
        * testsuite/26_numerics/endian/4.cc: New.

2019-07-26  François Dumont  <fdumont@gcc.gnu.org>

        * testsuite/util/testsuite_iterators.h
        (bidirectional_iterator_wrapper): Fix type comment.
        (random_access_iterator_wrapper): Likewise.

2019-07-25  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/bit (endian): Move definition here as per P1612R1.
        * include/std/type_traits (endian): Remove definition from here.
        * testsuite/20_util/endian/1.cc: Rename to ...
        * testsuite/26_numerics/endian/1.cc: ... here. Adjust header.

2019-07-25  Martin Liska  <mliska@suse.cz>
            Dominik Infuhr  <dominik.infuehr@theobroma-systems.com>

        PR c++/23383
        * testsuite/ext/bitmap_allocator/check_delete.cc: Add
        -fno-allocation-dce.
        * testsuite/ext/bitmap_allocator/check_new.cc: Likewise.
        * testsuite/ext/new_allocator/check_delete.cc: Likewise.
        * testsuite/ext/new_allocator/check_new.cc: Likewise.

2019-07-22  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/26_numerics/bit/bitops.count/*: Rename to ...
        * testsuite/26_numerics/bit/bit.count/*: Here.

        * include/std/bit (__rotl, __rotr): Change second parameter from
        unsigned int to int and handle negative values.
        (rotl, rotr): Remove check for __STRICT_ANSI__. Change second
        parameter from unsigned int to int. Add nodiscard attribute.
        * testsuite/26_numerics/bit/bitops.rot/rotl.cc: Rename to ...
        * testsuite/26_numerics/bit/bit.rotate/rotl.cc: Here. Test negative
        shifts.
        * testsuite/26_numerics/bit/bitops.rot/rotr.cc: Rename to ...
        * testsuite/26_numerics/bit/bit.rotate/rotr.cc: Here. Test negative
        shifts.

        * include/std/bit (__ceil2): Make unrepresentable results undefined,
        as per P1355R2. Add debug assertion. Perform one left shift, not two,
        so that out of range values cause undefined behaviour. Ensure that
        shift will still be undefined if left operand is promoted.
        * testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Replace checks for
        unrepresentable values with checks that they are not core constant
        expressions.
        * testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: New test.

2019-07-19  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_tempbuf.h (__detail::__return_temporary_buffer): Fix
        sized deallocation size computation.

2019-07-19  Andreas Schwab  <schwab@linux-m68k.org>

        * config/abi/post/m68k-linux-gnu/baseline_symbols.txt: Update.

2019-07-18  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_tempbuf.h (__detail::__return_temporary_buffer): New.
        (~_Temporary_buffer()): Use latter.
        (_Temporary_buffer(_FIterator, size_type)): Likewise.

2019-07-17  Andreas Schwab  <schwab@suse.de>

        * config/abi/post/ia64-linux-gnu/baseline_symbols.txt: Update.

2019-07-16  Jason Merrill  <jason@redhat.com>

        * include/std/memory (uses_allocator_construction_args): Add parens
        around constraint.

2019-07-12  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/29_atomics/atomic_float/1.cc: Fix comment.

        * include/experimental/string_view (__detail::__idt): Remove.
        (operator==, operator!=, operator<, operator>, operator<=, operator>=):
        Use __type_identity_t instead of __detail::__idt;
        * include/std/string_view (__detail::__idt): Remove.
        (operator==, operator!=, operator<, operator>, operator<=, operator>=):
        Use __type_identity_t instead of __detail::__idt;
        * include/std/type_traits (__type_identity_t): New alias template.

        * doc/xml/manual/status_cxx2020.xml: Update status for atomic_ref
        and floating point atomics.

2019-07-11  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/configure.xml: Improve documentation of
        --enable-libstdcxx-time option.

        * include/bits/atomic_base.h (__atomic_impl): New namespace for
        wrappers around atomic built-ins.
        (__atomic_float, __atomic_ref): New class templates for use as base
        classes.
        * include/std/atomic (atomic<float>, atomic<double>)
        (atomic<long double>): New explicit specializations.
        (atomic_ref): New class template.
        (__cpp_lib_atomic_ref): Define.
        * include/std/version (__cpp_lib_atomic_ref): Define.
        * testsuite/29_atomics/atomic/60695.cc: Adjust dg-error.
        * testsuite/29_atomics/atomic_float/1.cc: New test.
        * testsuite/29_atomics/atomic_float/requirements.cc: New test.
        * testsuite/29_atomics/atomic_ref/deduction.cc: New test.
        * testsuite/29_atomics/atomic_ref/float.cc: New test.
        * testsuite/29_atomics/atomic_ref/generic.cc: New test.
        * testsuite/29_atomics/atomic_ref/integral.cc: New test.
        * testsuite/29_atomics/atomic_ref/pointer.cc: New test.
        * testsuite/29_atomics/atomic_ref/requirements.cc: New test.

2019-07-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/ext/atomicity.h (__exchange_and_add, __atomic_add): Replace
        throw() with _GLIBCXX_NOTHROW.
        (__atomic_add_dispatch): Return after performing atomic increment.

2019-07-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/ext/atomicity.h [_GLIBCXX_ATOMIC_BUILTINS] (__atomic_add)
        (__exchange_and_add): Replace static specifier with always_inline
        attribute.
        (__exchange_and_add_single, __atomic_add_single): Likewise.
        (__exchange_and_add_dispatch, __atomic_add_dispatch): Likewise. Also
        combine !__gthread_active_p() and !__GTHREADS branches.

2019-07-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91067
        * acinclude.m4 (libtool_VERSION): Bump to 6:27:0.
        * configure: Regenerate.
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.27): Add new version. Export
        missing symbols.
        * testsuite/27_io/filesystem/iterators/91067.cc: New test.
        * testsuite/util/testsuite_abi.cc: Add new symbol version.

2019-07-02  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/c++config (_GLIBCXX_HAVE_BUILTIN_LAUNDER)
        (_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Use __has_builtin
        instead of __is_identifier to detect Clang support.

2019-07-02  Jim Wilson  <jimw@sifive.com>

        * configure.ac (BUILD_PDF): Also test for doxygen, dot, xsltproc,
        and xmllint.
        * configure: Regenerate.

2019-06-27  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91012
        * src/c++17/fs_path.cc (filesystem_error::_Impl): Use a string_view
        for the what_arg parameters.
        (filesystem_error::filesystem_error): Pass system_error::what() to
        the _Impl constructor.
        * testsuite/27_io/filesystem/filesystem_error/cons.cc: Ensure that
        filesystem_error::what() contains system_error::what().

2019-06-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/charconv (chars_format): Define bitmask type.
        * testsuite/20_util/to_chars/chars_format.cc: New test.

        * include/bits/fs_path.h (path::__is_encoded_char): Use __is_one_of.
        * include/std/bit (_If_is_unsigned_integer_type): Remove.
        (_If_is_unsigned_integer): Use __is_unsigned_integer.
        (rotl(byte, unsigned), rotr(byte, unsigned), countl_zero(byte))
        (countl_one(byte), countr_zero(byte), countr_one(byte))
        (popcount(byte), ispow2(byte), ceil2(byte), floor2(byte))
        (log2p1(byte)): Remove.
        * include/std/charconv (__detail::__is_one_of): Move to <type_traits>.
        (__detail::__is_int_to_chars_type): Remove.
        (__detail::__integer_to_chars_result_type): Use __is_signed_integer
        and __is_unsigned_integer.
        * include/std/type_traits (__is_one_of): Move here from <charconv>.
        (__is_signed_integer, __is_unsigned_integer): New helpers.
        * testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Remove test for
        std::byte overload.
        * testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Likewise.
        * testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Likewise.
        * testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.count/countl_one.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.count/countl_zero.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.count/countr_one.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.count/countr_zero.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.count/popcount.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.rot/rotl.cc: Likewise.
        * testsuite/26_numerics/bit/bitops.rot/rotr.cc: Likewise.

2019-06-25  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/numeric (midpoint(T, T)): Avoid std::abs in constexpr
        function.

2019-06-25  Jakub Jelinek  <jakub@redhat.com>

        * include/pstl/pstl_config.h (_PSTL_PRAGMA_SIMD_SCAN,
        _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN, _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN):
        Define to OpenMP 5.0 pragmas even for GCC 10.0+.
        (_PSTL_UDS_PRESENT): Define to 1 for GCC 10.0+.

2019-06-24  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/numeric (midpoint(T, T)): Change implementation for
        floating-point types to avoid incorrect rounding of denormals.
        * testsuite/26_numerics/midpoint/floating.cc: Add check for correct
        rounding with denormals.
        * testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error line numbers.
        * testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.

        * testsuite/18_support/headers/cfloat/values_c++17.cc: New test.

2019-06-20  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_ENABLE_DEBUG): Only do debug build for final
        stage of bootstrap.
        * configure: Regenerate.

        * include/std/variant (_Variant_storage, _Extra_visit_slot_needed):
        Qualify calls to __never_valueless.

        * doc/xml/manual/status_cxx2017.xml: Fix outdated reference to
        C++17 working draft.

        * testsuite/libstdc++-prettyprinters/simple.cc: Use non-palindromic
        vector<bool> for test.
        * testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

2019-06-19  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stream_iterator.h (istream_iterator::_M_equal()): Make
        private.
        (istream_iterator::_M_read()): Do not check stream state before
        attempting extraction. Set stream pointer to null when extraction
        fails (P0738R2).
        (operator==(const istream_iterator&, const istream_iterator&)): Change
        to be a hidden friend of istream_iterator.
        (operator!=(const istream_iterator&, const istream_iterator&)):
        Likewise.
        (ostream_iterator::ostream_iterator()): Add default constructor.
        (ostream_iterator::ostream_iterator(ostream_type*, const C*)): Use
        addressof.
        * testsuite/24_iterators/istream_iterator/1.cc: New test.
        * testsuite/24_iterators/ostream_iterator/1.cc: New test.
        * testsuite/24_iterators/ostream_iterator/70766.cc: Also check
        constructor taking a string.
        * testsuite/24_iterators/ostream_iterator/requirements/constexpr.cc:
        New test.

2019-06-19  Michael Weghorn  <m.weghorn@posteo.de>
            Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90945
        * python/libstdcxx/v6/printers.py (StdVectorPrinter._iterator): Use
        values of type bool for vector<bool> elements.
        * testsuite/libstdc++-prettyprinters/simple.cc: Test vector<bool>.
        * testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

2019-06-19  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90920 partially revert r263433
        * include/bits/stl_algo.h (__rotate): Restore checks for empty ranges.
        (rotate): Remove checks.
        * testsuite/25_algorithms/rotate/90920.cc: New test.

        * include/std/numeric (reduce(Iter, Iter, T, BinOp)): Fix value
        category used in invocable check.
        (reduce(Iter, Iter, T)): Pass initial value as rvalue.
        * testsuite/26_numerics/reduce/2.cc: New test.

2019-06-18  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/algorithmfwd.h: Change title of doc group.
        * include/bits/stl_algo.h (for_each_n): Add new C++17 algorithm from
        P0024R2.
        * include/bits/stl_numeric.h: Define doc group and add algos to it.
        * include/std/numeric (__is_random_access_iter): New internal trait.
        (reduce, transform_reduce, exclusive_scan, inclusive_scan)
        (transform_exclusive_scan, transform_inclusive_scan): Likewise.
        * testsuite/25_algorithms/for_each/for_each_n.cc: New test.
        * testsuite/26_numerics/exclusive_scan/1.cc: New test.
        * testsuite/26_numerics/inclusive_scan/1.cc: New test.
        * testsuite/26_numerics/reduce/1.cc: New test.
        * testsuite/26_numerics/transform_exclusive_scan/1.cc: New test.
        * testsuite/26_numerics/transform_inclusive_scan/1.cc: New test.
        * testsuite/26_numerics/transform_reduce/1.cc: New test.
        * testsuite/util/testsuite_iterators.h (test_container::size()): New
        member function.

        * include/c_global/cstddef (std::byte): Perform arithmetic operations
        in unsigned int to avoid promotion (LWG 2950).

2019-06-17  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/allocator/1.cc: Add sized delete, which fixes a
        failure on AIX.

        * include/c_global/cmath (__lerp, lerp): Add noexcept (LWG 3201).

        PR libstdc++/90281 Fix string conversions for filesystem::path
        * include/bits/fs_path.h (u8path) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]:
        Use codecvt_utf8_utf16 instead of codecvt_utf8. Use
        __str_codecvt_in_all to fail for partial conversions and throw on
        error.
        [!_GLIBCXX_FILESYSTEM_IS_WINDOWS && _GLIBCXX_USE_CHAR8_T]
        (path::_Cvt<char8_t>): Add explicit specialization.
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_wconvert): Remove
        overloads.
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_convert): Use
        if-constexpr instead of dispatching to _S_wconvert. Use codecvt
        instead of codecvt_utf8. Use __str_codecvt_in_all and
        __str_codecvt_out_all.
        [!_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_convert): Use
        codecvt instead of codecvt_utf8. Use __str_codecvt_out_all.
        (path::_S_str_convert) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
        codecvt_utf8_utf16 instead of codecvt_utf8. Construct return values
        with allocator. Use __str_codecvt_out_all. Fallthrough to POSIX code
        after converting to UTF-8.
        (path::_S_str_convert): Use codecvt instead of codecvt_utf8. Use
        __str_codecvt_in_all.
        (path::string): Fix initialization of string types with different
        allocators.
        (path::u8string) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
        codecvt_utf8_utf16 instead of codecvt_utf8. Use __str_codecvt_out_all.
        * include/bits/locale_conv.h (__do_str_codecvt): Reorder static and
        runtime conditions.
        (__str_codecvt_out_all, __str_codecvt_in_all): New functions that
        return false for partial conversions.
        * include/experimental/bits/fs_path.h (u8path):
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Implement correctly for mingw.
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_wconvert): Add
        missing handling for char8_t. Use codecvt and codecvt_utf8_utf16
        instead of codecvt_utf8. Use __str_codecvt_in_all and
        __str_codecvt_out_all.
        [!_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_convert): Use
        codecvt instead of codecvt_utf8. Use __str_codecvt_out_all.
        (path::string) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
        codecvt_utf8_utf16 instead of codecvt_utf8. Construct return values
        with allocator. Use __str_codecvt_out_all and __str_codecvt_in_all.
        (path::string) [!_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
        __str_codecvt_in_all.
        (path::u8string) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
        codecvt_utf8_utf16 instead of codecvt_utf8. Use __str_codecvt_out_all.
        * src/c++17/fs_path.cc (path::_S_convert_loc): Use
        __str_codecvt_in_all.
        * src/filesystem/path.cc (path::_S_convert_loc): Likewise.
        * testsuite/27_io/filesystem/path/construct/90281.cc: New test.
        * testsuite/27_io/filesystem/path/factory/u8path.cc: New test.
        * testsuite/27_io/filesystem/path/native/string.cc: Test with empty
        strings and with Unicode characters outside the basic multilingual
        plane.
        * testsuite/27_io/filesystem/path/native/alloc.cc: New test.
        * testsuite/experimental/filesystem/path/construct/90281.cc: New test.
        * testsuite/experimental/filesystem/path/factory/u8path.cc: New test.
        * testsuite/experimental/filesystem/path/native/alloc.cc: New test.
        * testsuite/experimental/filesystem/path/native/string.cc: Test with
        empty strings and with Unicode characters outside the basic
        multilingual plane.

2019-06-17  François Dumont  <fdumont@gcc.gnu.org>
            Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/hashtable.h (struct _Hashtable::_Scoped_node): New type.
        (_Hashtable::_M_insert_unique_node): Add key_type parameter. Don't
        deallocate node if insertion fails.
        (_Hashtable::_M_insert_multi_node): Likewise.
        (_Hashtable::_M_reinsert_node): Pass additional key argument.
        (_Hashtable::_M_reinsert_node_multi): Likewise. Remove FIXME.
        (_Hashtable::_M_extract_node(size_t, __node_base*)): New function.
        (_Hashtable::extract(const_iterator)): Use _M_extract_node.
        (_Hashtable::extract(const _Key&)): Likewise.
        (_Hashtable::_M_merge_unique): Pass additional key argument.
        (_Hashtable::_M_emplace<Args>(true_type, Args&&...)): Likewise. Use
        _Scoped_node.
        (_Hashtable::_M_insert): Likewise.
        * include/bits/hashtable_policy.h (_Map_base::operator[]): Likewise.
        (_Hashtable_alloc): Add comments to functions with misleading names.

2019-06-17  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/bad_function_call/what.cc: Include <string> header
        for std::string.
        * testsuite/20_util/shared_ptr/cons/weak_ptr_expired.cc: Likewise.
        * testsuite/20_util/tuple/cons/allocator_with_any.cc: Include <memory>
        header for std::allocator.
        * testsuite/23_containers/array/tuple_interface/tuple_element.cc: Add
        using-declaration for std::size_t.
        * testsuite/23_containers/array/tuple_interface/tuple_size.cc:
        Likewise.
        * testsuite/23_containers/deque/cons/55977.cc: Include <istream> for
        std::istream.
        * testsuite/23_containers/vector/cons/55977.cc: Likewise.
        * testsuite/experimental/map/erasure.cc: Include <string> for
        std::string.
        * testsuite/experimental/unordered_map/erasure.cc: Likewise.

2019-06-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/type_traits (experimental::nonesuch): Use
        pragma to disable -Wctor-dtor-privacy warnings.
        * include/std/type_traits (__is_convertible_helper<From, To, false>)
        (__is_nt_convertible_helper<From, To, false>, __nonesuch): Likewise.

        * include/std/version (__cpp_lib_bind_front): Add missing macro.

2019-06-12  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/algorithm (__cpp_lib_parallel_algorithm): Fix value.
        * include/std/memory (__cpp_lib_parallel_algorithm): Likewise.
        * include/std/numeric (__cpp_lib_parallel_algorithm): Likewise.
        * testsuite/25_algorithms/pstl/feature_test.cc: New test.

        * include/std/variant (get<T>, get<N>, get_if<N>, get_if<T>)
        (variant::emplace): Change static_assert messages from "should be"
        to "must be".
        (hash<monostate>::operator()): Remove name of unused parameter.

        * include/std/mutex (scoped_lock::~scoped_lock()): Use fold
        expression.

        * include/Makefile.am: Add new <bits/charconv.h> header.
        * include/Makefile.in: Regenerate.
        * include/bits/basic_string.h (to_string(int), to_string(unsigned))
        (to_string(long), to_string(unsigned long), to_string(long long))
        (to_string(unsigned long long)): Rewrite to use __to_chars_10_impl.
        * include/bits/charconv.h: New header.
        (__detail::__to_chars_len): Move here from <charconv>.
        (__detail::__to_chars_10_impl): New function extracted from
        __detail::__to_chars_10.
        * include/std/charconv (__cpp_lib_to_chars): Add, but comment out.
        (__to_chars_unsigned_type): New class template that reuses
        __make_unsigned_selector_base::__select to pick a type.
        (__unsigned_least_t): Redefine as __to_chars_unsigned_type<T>::type.
        (__detail::__to_chars_len): Move to new header.
        (__detail::__to_chars_10): Add inline specifier. Move code doing the
        output to __detail::__to_chars_10_impl and call that.
        * include/std/version (__cpp_lib_to_chars): Add, but comment out.
        * testsuite/21_strings/basic_string/numeric_conversions/char/
        to_string.cc: Fix reference in comment. Remove unused variable.
        * testsuite/21_strings/basic_string/numeric_conversions/char/
        to_string_int.cc: New test.

2019-06-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

        Fix ConstexprIterator requirements tests - No constexpr algorithms!
        * testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc:
        Replace copy with hand-rolled loop.
        * testsuite/23_containers/array/requirements/constexpr_iter.cc:
        Ditto.

2019-06-08  Edward Smith-Rowland  <3dw4rd@verizon.net>

        Test for C++20 p0858 - ConstexprIterator requirements.
        * testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc:
        New test.
        * testsuite/23_containers/array/requirements/constexpr_iter.cc:
        New test.

2019-06-07  Thomas Rodgers  <trodgers@redhat.com>

        Rename PSTL macro's consistent with libstdc++ (and llvm upstream
        project) standards.
        * include/bits/c++config: Rename all macros of the form __PSTL* to
        _PSTL*.
        * include/std/algorithm: Likewise.
        * include/std/execution: Likewise.
        * include/std/numeric: Likewise.
        * include/std/memory: Likewise.
        * include/pstl/glue_memory_impl.h: Likewise.
        * include/pstl/numeric_impl.h: Likewise.
        * include/pstl/glue_memory_defs.h: Likewise.
        * include/pstl/execution_defs.h: Likewise.
        * include/pstl/utils.h: Likewise.
        * include/pstl/algorithm_fwd.h: Likewise.
        * include/pstl/unseq_backend_simd.h: Likewise.
        * include/pstl/glue_execution_defs.h: Likewise.
        * include/pstl/algorithm_impl.h: Likewise.
        * include/pstl/parallel_impl.h: Likewise.
        * include/pstl/memory_impl.h: Likewise.
        * include/pstl/glue_numeric_defs.h: Likewise.
        * include/pstl/parallel_backend_utils.h: Likewise.
        * include/pstl/glue_algorithm_defs.h: Likewise.
        * include/pstl/parallel_backend.h: Likewise.
        * include/pstl/glue_numeric_impl.h: Likewise.
        * include/pstl/parallel_backend_tbb.h: Likewise.
        * include/pstl/numeric_fwd.h: Likewise.
        * include/pstl/glue_algorithm_impl.h: Likewise.
        * include/pstl/execution_impl.h: Likewise.
        * include/pstl/pstl_config.h: Likewise.
        * testsuite/util/pstl/pstl_test_config.h: Likewise.
        * testsuite/util/pstl/test_utils.h: Likewise.
        * testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc:
        Likewise.
        * testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc:
        Likewise.
        * testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc:
        Likewise.
        * testsuite/26_numerics/pstl/numeric_ops/scan.cc: Likewise.
        * testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc: Likewise.
        * testsuite/26_numerics/pstl/numeric_ops/reduce.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_merge/merge.cc: Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc:
        Likewise.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc: Likewise.

        Rename header guards to be consistent with upstream project's
        conventions.
        * include/pstl/glue_memory_impl.h: Rename all macros of the form
        _PSTL_(.*)_H to _PSTL_\U\1_H.
        * include/pstl/numeric_impl.h: Likewise.
        * include/pstl/glue_memory_defs.h: Likewise.
        * include/pstl/execution_defs.h: Likewise.
        * include/pstl/utils.h: Likewise.
        * include/pstl/algorithm_fwd.h: Likewise.
        * include/pstl/unseq_backend_simd.h: Likewise.
        * include/pstl/glue_execution_defs.h: Likewise.
        * include/pstl/algorithm_impl.h: Likewise.
        * include/pstl/parallel_impl.h: Likewise.
        * include/pstl/memory_impl.h: Likewise.
        * include/pstl/glue_numeric_defs.h: Likewise.
        * include/pstl/parallel_backend_utils.h: Likewise.
        * include/pstl/glue_algorithm_defs.h: Likewise.
        * include/pstl/parallel_backend.h: Likewise.
        * include/pstl/glue_numeric_impl.h: Likewise.
        * include/pstl/parallel_backend_tbb.h: Likewise.
        * include/pstl/numeric_fwd.h: Likewise.
        * include/pstl/glue_algorithm_impl.h: Likewise.
        * include/pstl/execution_impl.h: Likewise.
        * include/pstl/pstl_config.h: Likewise.
        * testsuite/util/pstl/pstl_test_config.h: Likewise.

        Synchronize libstdc++ parallel algorithms with upstream
        project.
        * include/pstl/algorithm_fwd.h: Synchronize with
        upstream PSTL project.
        * include/pstl/algorithm_impl.h: Likewise.
        * include/pstl/execution_defs.h: Likewise.
        * include/pstl/execution_impl.h: Likewise.
        * include/pstl/glue_algorithm_impl.h: Likewise.
        * include/pstl/glue_execution_defs.h: Likewise.
        * include/pstl/numeric_fwd.h: Likewise.
        * include/pstl/numeric_impl.h: Likewise.
        * include/pstl/parallel_backend.h: Likewise.
        * include/pstl/pstl_config.h: Likewise.
        * include/pstl/unseq_backend_simd.h: Likewise.
        * include/pstl/parallel_backend_serial.h: New file.
        * include/Makefile.am (pstl_headers): Add
        parallel_backend_serial.h.
        * include/Makefile.in: Regenerate.

        Clean up non-conforming names
        * include/pstl/algorithm_impl.h (__parallel_set_union_op):
        Uglfiy copy_range1 and copy_range2
        (__pattern_walk2_n): Rename local n to __n
        * include/pstl/parallel_backend_tbb.h (struct __binary_no_op):
        Rename parameter _T to _Tp.

        Integrate non-TBB serial backend support
        * include/bits/c++config: Adjust TBB detection logic to select serial
        PSTL backend if no TBB present.
        * testsuite/utils/pstl/test_utils.h: Remove check for
        _PSTL_USE_PAR_POLICIES
        
2019-06-07  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/24_iterators/container_access.cc: Move dg-options before
        dg-do directive so the target check uses the -std option.

        PR libstdc++/90770
        * configure: Regenerate.
        * src/Makefile.am (stamp-debug): Also test for missing makefile.
        * src/Makefile.in: Regenerate.

2019-06-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/array: Do not include <stdexcept>.
        * include/std/optional: Include <exception> and
        <bits/exception_defines.h> instead of <stdexcept>.
        * testsuite/20_util/function_objects/searchers.cc: Include <cctype>
        for std::isalnum.
        * testsuite/20_util/tuple/cons/deduction.cc: Include <memory> for
        std::allocator.
        * testsuite/23_containers/map/erasure.cc: Include <string>.
        * testsuite/23_containers/unordered_map/erasure.cc: Likewise.

        * testsuite/23_containers/deque/requirements/dr438/assign_neg.cc: Add
        dg-prune-output for different C++98 diagnostic.
        * testsuite/23_containers/deque/requirements/dr438/constructor_1_neg.cc:
        Likewise.
        * testsuite/23_containers/deque/requirements/dr438/constructor_2_neg.cc:
        Likewise.
        * testsuite/23_containers/deque/requirements/dr438/insert_neg.cc:
        Likewise.
        * testsuite/23_containers/list/requirements/dr438/assign_neg.cc:
        Likewise.
        * testsuite/23_containers/list/requirements/dr438/constructor_1_neg.cc:
        Likewise.
        * testsuite/23_containers/list/requirements/dr438/constructor_2_neg.cc:
        Likewise.
        * testsuite/23_containers/list/requirements/dr438/insert_neg.cc:
        Likewise.
        * testsuite/23_containers/vector/requirements/dr438/assign_neg.cc:
        Likewise.
        * testsuite/23_containers/vector/requirements/dr438/
        constructor_1_neg.cc: Likewise.
        * testsuite/23_containers/vector/requirements/dr438/
        constructor_2_neg.cc: Likewise.
        * testsuite/23_containers/vector/requirements/dr438/insert_neg.cc:
        Likewise.
        * testsuite/libstdc++-prettyprinters/compat.cc: Do not run for C++98.

        * testsuite/23_containers/unordered_map/requirements/debug_container.cc:
        Do not test allocator rebinding extension for C++2a.
        * testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: Change
        dg-do directive for C++17 and C++2a.

        * testsuite/23_containers/deque/requirements/explicit_instantiation/
        1_c++0x.cc: Remove redundant test.
        * testsuite/23_containers/deque/requirements/explicit_instantiation/
        2.cc: Use target selector instead of preprocessor condition.
        * testsuite/23_containers/deque/requirements/explicit_instantiation/
        3.cc: Do not run test for C++2a.
        * testsuite/23_containers/forward_list/requirements/
        explicit_instantiation/3.cc: Likewise.
        * testsuite/23_containers/forward_list/requirements/
        explicit_instantiation/5.cc: Do not test allocator rebinding extension
        for C++2a.
        * testsuite/23_containers/list/requirements/explicit_instantiation/
        1_c++0x.cc: Remove redundant test.
        * testsuite/23_containers/list/requirements/explicit_instantiation/
        2.cc: Use target selector instead of preprocessor condition.
        * testsuite/23_containers/list/requirements/explicit_instantiation/
        3.cc: Do not run test for C++2a.
        * testsuite/23_containers/list/requirements/explicit_instantiation/
        5.cc: Do not test allocator rebinding extension for C++2a.
        * testsuite/23_containers/map/requirements/explicit_instantiation/
        1_c++0x.cc: Remove redundant test.
        * testsuite/23_containers/map/requirements/explicit_instantiation/
        2.cc: Adjust comment.
        * testsuite/23_containers/map/requirements/explicit_instantiation/
        3.cc: Do not run test for C++2a.
        * testsuite/23_containers/map/requirements/explicit_instantiation/
        5.cc: Do not test allocator rebinding extension for C++2a.
        * testsuite/23_containers/multimap/requirements/explicit_instantiation/
        1_c++0x.cc: Remove redundant test.
        * testsuite/23_containers/multimap/requirements/explicit_instantiation/
        3.cc: Do not run test for C++2a.
        * testsuite/23_containers/multimap/requirements/explicit_instantiation/
        5.cc: Do not test allocator rebinding extension for C++2a.
        * testsuite/23_containers/multiset/requirements/explicit_instantiation/
        3.cc: Do not run test for C++2a.
        * testsuite/23_containers/multiset/requirements/explicit_instantiation/
        5.cc: Do not test allocator rebinding extension for C++2a.
        * testsuite/23_containers/set/requirements/explicit_instantiation/3.cc:
        Do not run test for C++2a.
        * testsuite/23_containers/set/requirements/explicit_instantiation/
        1_c++0x.cc: Remove redundant test.
        * testsuite/23_containers/set/requirements/explicit_instantiation/5.cc:
        Do not test allocator rebinding extension for C++2a.
        * testsuite/23_containers/unordered_map/requirements/
        explicit_instantiation/3.cc: Likewise.
        * testsuite/23_containers/unordered_map/requirements/
        explicit_instantiation/5.cc: Do not test allocator rebinding extension
        for C++2a.
        * testsuite/23_containers/unordered_multimap/requirements/
        explicit_instantiation/3.cc: Do not run test for C++2a.
        * testsuite/23_containers/unordered_multimap/requirements/
        explicit_instantiation/5.cc: Do not test allocator rebinding extension
        for C++2a.
        * testsuite/23_containers/unordered_multiset/requirements/
        explicit_instantiation/3.cc: Do not run test for C++2a.
        * testsuite/23_containers/unordered_multiset/requirements/
        explicit_instantiation/5.cc: Do not test allocator rebinding extension
        for C++2a.
        * testsuite/23_containers/unordered_set/requirements/
        explicit_instantiation/3.cc: Do not run test for C++2a.
        * testsuite/23_containers/unordered_set/requirements/
        explicit_instantiation/5.cc: Do not test allocator rebinding extension
        for C++2a.
        * testsuite/23_containers/vector/ext_pointer/explicit_instantiation/
        2.cc: Remove redundant test.
        * testsuite/23_containers/vector/ext_pointer/explicit_instantiation/
        3.cc: Do not run test for C++2a.
        * testsuite/23_containers/vector/requirements/explicit_instantiation/
        3.cc: Likewise.

        * include/std/type_traits (is_empty, is_polymorphic, is_final)
        (is_abstract, is_aggregate): Remove static_assert.
        * testsuite/20_util/is_abstract/incomplete_neg.cc: Check for error
        from builtin only.
        * testsuite/20_util/is_aggregate/incomplete_neg.cc: Likewise. Add
        missing -std=gnu++17 option.
        * testsuite/20_util/is_empty/incomplete_neg.cc: New test.
        * testsuite/20_util/is_final/incomplete_neg.cc: New test.
        * testsuite/20_util/is_polymorphic/incomplete_neg.cc: Check for error
        from builtin only.

        * testsuite/18_support/set_terminate.cc: Do not run for C++98 mode.
        * testsuite/18_support/set_unexpected.cc: Likewise.
        * testsuite/20_util/is_nothrow_invocable/value.cc: Test converting to
        void.
        * testsuite/20_util/is_nothrow_invocable/value_ext.cc: Fix constexpr
        function to be valid in C++11.
        * testsuite/26_numerics/complex/proj.cc: Do not run for C++98 mode.
        * testsuite/experimental/names.cc: Do not run for C++98 mode. Do not
        include Library Fundamentals or Networking headers in C++11 mode.
        * testsuite/ext/char8_t/atomic-1.cc: Do not run for C++98 mode.

        * include/std/tuple (_TC): Replace with _TupleConstraints.
        (_TupleConstraints): New helper for SFINAE constraints, with more
        expressive member functions to reduce duplication when used.
        (tuple::_TC2, tuple::_TMC, tuple::_TNTC): Remove.
        (tuple::_TCC): Replace dummy type parameter with bool non-type
        parameter that can be used to check the pack size.
        (tuple::_ImplicitDefaultCtor, tuple::_ExplicitDefaultCtor)
        (tuple::_ImplicitCtor, tuple::_ExplicitCtor): New alias templates for
        checking constraints in constructors.
        (tuple::__valid_args, tuple::_UseOtherCtor, tuple::__use_other_ctor):
        New SFINAE helpers.
        (tuple::tuple): Use new helpers to reduce repitition in constraints.
        (tuple::tuple(allocator_arg_t, const Alloc&)): Constrain.
        (tuple<T1, T2>::_TCC, tuple<T1, T2>::_ImplicitDefaultCtor)
        (tuple<T1, T2>::_ExplicitDefaultCtor, tuple<T1, T2>::_ImplicitCtor)
        (tuple<T1, T2>::_ExplicitCtor): New alias templates for checking
        constraints in constructors.
        (tuple::__is_alloc_arg()): New SFINAE helpers.
        (tuple<T1, T2>::tuple): Use new helpers to reduce repitition in
        constraints.
        (tuple<T1, T2>::tuple(allocator_arg_t, const Alloc&)): Constrain.
        * testsuite/20_util/tuple/cons/90700.cc: New test.
        * testsuite/20_util/tuple/cons/allocators.cc: Add default constructor
        to meet new constraint on allocator-extended default constructor.

2019-06-03  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_map.h (map): Disable static assert for C++98 mode.
        * include/bits/stl_multimap.h (multimap): Likewise.

2019-06-03  François Dumont  <fdumont@gcc.gnu.org>

        Rename variables and cleanup comments.
        * include/bits/hashtable_policy.h
        * include/bits/hashtable.h

2019-06-03  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2020.xml: Add missing row for P0920R2.
        Fix bgcolor for P0340R3.
        * doc/html/*: Regenerate.

        PR libstdc++/90686
        * doc/xml/manual/status_cxx2014.xml: Document what's missing from
        <experimental/memory_resource>.
        * doc/xml/manual/status_cxx2020.xml: Document status of P1285R0,
        P0339R6, P0340R3, P1164R1 and P1357R1.
        * doc/html/*: Regenerate.

        * doc/xml/manual/status_cxx2020.xml: Document P1463R1 status.
        * include/bits/forward_list.h [__cplusplus > 201703]: Enable
        allocator::value_type assertion for C++2a.
        * include/bits/hashtable.h: Likewise.
        * include/bits/stl_deque.h: Likewise.
        * include/bits/stl_list.h: Likewise.
        * include/bits/stl_map.h: Likewise.
        * include/bits/stl_multimap.h: Likewise.
        * include/bits/stl_multiset.h: Likewise.
        * include/bits/stl_set.h: Likewise.
        * include/bits/stl_vector.h: Likewise.
        * testsuite/23_containers/deque/48101-3_neg.cc: New test.
        * testsuite/23_containers/forward_list/48101-3_neg.cc: New test.
        * testsuite/23_containers/list/48101-3_neg.cc: New test.
        * testsuite/23_containers/map/48101-3_neg.cc: New test.
        * testsuite/23_containers/multimap/48101-3_neg.cc: New test.
        * testsuite/23_containers/multiset/48101-3_neg.cc: New test.
        * testsuite/23_containers/set/48101-3_neg.cc: New test.
        * testsuite/23_containers/unordered_map/48101-3_neg.cc: New test.
        * testsuite/23_containers/unordered_multimap/48101-3_neg.cc: New test.
        * testsuite/23_containers/unordered_multiset/48101-3_neg.cc: New test.
        * testsuite/23_containers/unordered_set/48101-3_neg.cc: New test.
        * testsuite/23_containers/vector/48101-3_neg.cc: New test.

2019-05-31  Gerald Pfeifer  <gerald@pfeifer.com>

        * doc/xml/manual/allocator.xml: Move hoard.org back to http.

2019-05-31  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/tuple (tuple<>): Add noexcept to allocator-extended
        constructors.
        (tuple<T1, T2>::__nothrow_default_constructible()): New helper
        function.
        (tuple<T1, T2>::tuple(), explicit tuple<T1, T2>::tuple()): Use helper.

2019-05-31  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++98/bitmap_allocator.cc: Add using-declaration for size_t.

        PR libstdc++/90682
        * libsupc++/eh_term_handler.cc: Include eh_term_handler.h to get
        definition of _GLIBCXX_DEFAULT_TERM_HANDLER.
        * libsupc++/eh_term_handler.h: New header defining
        _GLIBCXX_DEFAULT_TERM_HANDLER.
        * libsupc++/eh_terminate.cc: Include eh_term_handler.h.
        (set_terminate): Restore default handler when argument is null.
        (set_unexpected): Likewise.
        * testsuite/18_support/set_terminate.cc: New test.
        * testsuite/18_support/set_unexpected.cc: New test.

        * include/backward/hashtable.h (size_t, ptrdiff_t)
        (forward_iterator_tag, input_iterator_tag, _Construct, _Destroy)
        (distance, vector, pair, __iterator_category): Remove
        using-declarations that add these names to namespace __gnu_cxx.
        * include/ext/bitmap_allocator.h (size_t, ptrdiff_t): Likewise.
        * include/ext/debug_allocator.h (size_t): Likewise.
        * include/ext/functional (size_t, unary_function, binary_function)
        (mem_fun1_t, const_mem_fun1_t, mem_fun1_ref_t, const_mem_fun1_ref_t):
        Likewise.
        * include/ext/malloc_allocator.h (size_t, ptrdiff_t): Likewise.
        * include/ext/memory (ptrdiff_t, pair, __iterator_category): Likewise.
        * include/ext/mt_allocator.h (size_t, ptrdiff_t): Likewise.
        * include/ext/new_allocator.h (size_t, ptrdiff_t): Likewise.
        * include/ext/numeric (iota): Fix outdated comment.
        * include/ext/pool_allocator.h (size_t, ptrdiff_t): Likewise.
        * include/ext/rb_tree (_Rb_tree, allocator): Likewise.
        * include/ext/rope (size_t, ptrdiff_t, allocator, _Destroy): Likewise.
        * include/ext/ropeimpl.h (size_t, printf, basic_ostream)
        (__throw_length_error, _Destroy, std::__uninitialized_fill_n_a):
        Likewise.
        * include/ext/slist (size_t, ptrdiff_t, _Construct, _Destroy)
        (allocator, __true_type, __false_type): Likewise.

2019-05-31  Antony Polukhin  <antoshkka@gmail.com>

        PR libstdc++/71579
        * include/std/type_traits __type_identity, __is_complete_or_unbounded):
        New helpers for checking preconditions in traits.
        (is_trivial, is_trivially_copyable, is_standard_layout, is_pod)
        (is_literal_type, is_empty, is_polymorphic, is_final, is_abstract)
        (is_destructible, is_nothrow_destructible, is_constructible)
        (is_default_constructible, is_copy_constructible)
        (is_move_constructible, is_nothrow_default_constructible)
        (is_nothrow_constructible, is_nothrow_copy_constructible)
        (is_nothrow_move_constructible, is_copy_assignable, is_move_assignable)
        (is_nothrow_assignable, is_nothrow_copy_assignable)
        (is_nothrow_move_assignable, is_trivially_constructible)
        (is_trivially_copy_constructible, is_trivially_move_constructible)
        is_trivially_assignable, is_trivially_copy_assignable)
        (is_trivially_move_assignable, is_trivially_destructible)
        (alignment_of, is_swappable, is_nothrow_swappable, is_invocable)
        (is_invocable_r, is_nothrow_invocable)
        (has_unique_object_representations, is_aggregate): Add static_asserts
        to make sure that type traits are not misused with incomplete types.
        (__is_constructible_impl, __is_nothrow_default_constructible_impl)
        (__is_nothrow_constructible_impl, __is_nothrow_assignable_impl): New
        base characteristics without assertions that can be reused in other
        traits.
        * testsuite/20_util/is_complete_or_unbounded/memoization.cc: New test.
        * testsuite/20_util/is_complete_or_unbounded/memoization_neg.cc: New
        test.
        * testsuite/20_util/is_complete_or_unbounded/value.cc: New test.
        * testsuite/20_util/is_abstract/incomplete_neg.cc: New test.
        * testsuite/20_util/is_aggregate/incomplete_neg.cc: New test.
        * testsuite/20_util/is_class/value.cc: Check incomplete type.
        * testsuite/20_util/is_function/value.cc: Likewise.
        * testsuite/20_util/is_move_constructible/incomplete_neg.cc: New test.
        * testsuite/20_util/is_nothrow_move_assignable/incomplete_neg.cc: New
        test.
        * testsuite/20_util/is_polymorphic/incomplete_neg.cc: New test.
        * testsuite/20_util/is_reference/value.cc: Check incomplete types.
        * testsuite/20_util/is_unbounded_array/value.cc: Likewise.
        * testsuite/20_util/is_union/value.cc: Likewise.
        * testsuite/20_util/is_void/value.cc: Likewise.
        * testsuite/util/testsuite_tr1.h: Add incomplete union type.

2019-05-31  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/random.h (random_device::_M_init(const char*, size_t)):
        Add new private member function.
        * src/c++11/cow-string-inst.cc (random_device::_M_init(const string&))
        (random_device::_M_init_pretr1(const string&)): Call new private
        member with string data.
        * src/c++11/random.cc (random_device::_M_init(const char*, size_t)):
        Define.
        * testsuite/26_numerics/random/random_device/cons/default-cow.cc: New
        test using COW strings.
        * testsuite/26_numerics/random/random_device/cons/default.cc: Generate
        a value from the device.
        * testsuite/26_numerics/random/random_device/cons/token.cc: Likewise.
        Fix typo in token string.

2019-05-30  Nina Dinka Ranns  <dinka.ranns@gmail.com>

        LWG2788 basic_string spurious use of a default constructible allocator
        * include/bits/basic_string.tcc [_GLIBCXX_USE_CXX11_ABI]
        (basic_string::_M_replace_dispatch): Construct temporary string with
        the current allocator.
        * testsuite/21_strings/basic_string/allocator/char/lwg2788.cc: New.
        * testsuite/21_strings/basic_string/allocator/wchar_t/lwg2788.cc: New.

2019-05-30  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/diagnostics.xml: Update list of headers that define
        exception classes.
        * doc/xml/manual/support.xml: Rewrite advice around NULL. Rewrite
        section about new/delete overloads. Improve section on verbose
        terminate handler.
        * doc/html/*: Regenerate.

        * doc/xml/manual/status_cxx2020.xml: Add feature-test macro for
        P0811R3. Change status of P1353R0.
        * doc/html/*: Regenerate.

        * doc/xml/manual/status_cxx2011.xml: Use <variablelist> for
        documentation of implementation-defined types for [thread.req.native].
        * doc/xml/manual/status_cxx2017.xml: Update documentation of
        implementation-defined strings for [variant.bad.access]. Fix typo in
        documentation of implementation-defined support for [fs.conform.9945].
        * doc/html/*: Regenerate.

2019-05-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/85494
        * testsuite/26_numerics/random/random_device/cons/token.cc: Fix test
        that fails on mingw-w64.

        PR libstdc++/88881
        * src/c++17/fs_ops.cc [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
        (status(const path&, error_code&)): Use parent_path() to remove
        trailing slash.
        (symlink_status(const path&, error_code&)): Duplicate workaround for
        bug in _wstat for paths with trailing slash.
        * testsuite/27_io/filesystem/operations/remove_all.cc: Check path
        with trailing slash.
        * testsuite/27_io/filesystem/operations/status.cc: Likewise.
        * testsuite/27_io/filesystem/operations/symlink_status.cc: Likewise.

        * src/c++17/fs_path.cc (path::parent_path()): Create whole path at
        once instead of building it iteratively.

        * testsuite/util/testsuite_api.h: Remove names of unused parameters.

        PR libstdc++/85494 use rdseed and rand_s in std::random_device
        * acinclude.m4 (GLIBCXX_CHECK_X86_RDSEED): Define macro to check if
        the assembler supports rdseed.
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * configure.ac: Use GLIBCXX_CHECK_X86_RDSEED.
        * config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_CRT_RAND_S): Define.
        * doc/html/*: Regenerate.
        * doc/xml/manual/status_cxx2011.xml: Document new tokens.
        * include/bits/random.h (random_device::random_device()): Always call
        _M_init rather than _M_init_pretr1.
        (random_device::random_device(const string&)): Likewise.
        (random_device::operator()()): Always call _M_getval().
        (random_device::_M_file): Replace first member of union with an
        anonymous struct, with _M_file as its first member.
        * src/c++11/random.cc [_GLIBCXX_X86_RDRAND] (USE_RDRAND): Define.
        [_GLIBCXX_X86_RDSEED] (USE_RDSEED): Define.
        (USE_MT19937): Define if none of the above are defined.
        (USE_POSIX_FILE_IO): Define.
        (_M_strtoul): Remove.
        [USE_RDSEED] (__x86_rdseed): Define new function.
        [_GLIBCXX_USE_CRT_RAND_S] (__winxp_rand_s): Define new function.
        (random_device::_M_init(const string&)): Initialize new union members.
        Add support for "rdseed" and "rand_s" tokens. Decide what the
        "default" token does according to which USE_* macros are defined.
        [USE_POSIX_FILE_IO]: Store a file descriptor.
        [USE_MT19937]: Forward to _M_init_pretr1 instead.
        (random_device::_M_init_pretr1(const string&)) [USE_MT19937]: Inline
        code from _M_strtoul.
        [!USE_MT19937]: Call _M_init, transforming the old default token or
        numeric tokens to "default".
        (random_device::_M_fini()) [USE_POSIX_FILE_IO]: Use close not fclose.
        (random_device::_M_getval()): Use new union members to obtain a
        random number from the stored function pointer or file descriptor.
        [USE_MT19937]: Obtain a value from the mt19937 engine.
        (random_device::_M_getval_pretr1()): Call _M_getval().
        (random_device::_M_getentropy()) [USE_POSIX_FILE_IO]: Use _M_fd
        instead of fileno.
        [!USE_MT19937] (mersenne_twister): Do not instantiate when not needed.
        * testsuite/26_numerics/random/random_device/85494.cc: New test.

2019-05-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90634
        * include/experimental/bits/fs_path.h (path::path(path&&)): Only call
        _M_split_cmpts() for a path with multiple components.
        (path::_S_is_dir_sep()): Add missing 'static' keyword to function.
        * src/filesystem/path.cc (path::_M_split_cmpts()): Count number of
        components and reserve space in vector. Return early when there is
        only one component.
        * testsuite/27_io/filesystem/path/construct/90634.cc: New test.
        * testsuite/experimental/filesystem/path/construct/90634.cc: New test.

        * testsuite/util/testsuite_fs.h (compare_paths): Use three-argument
        form of std::equals for C++11 compatibility.

2019-05-26  Gerald Pfeifer  <gerald@pfeifer.com>

        * doc/xml/manual/appendix_contributing.xml: Update pointer to
        C++ standard at ansi.org.

2019-05-24  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/numeric (midpoint(T*, T*)): Fix incorrect result.
        * testsuite/26_numerics/midpoint/pointer.cc: Change "compile" test
        to "run".

        * testsuite/20_util/shared_ptr/cons/alias-rval.cc: Fix test.
        * testsuite/20_util/shared_ptr/cons/alias.cc: Remove unused function.

2019-05-23  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/function_objects/invoke/1.cc: Move C++17-specific
        tests to ...
        * testsuite/20_util/function_objects/invoke/3.cc: New test.
        * testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: Change
        "compile" test to "run".

        * doc/xml/manual/intro.xml: Document LWG DR 2996 change.
        * doc/html/*: Regenerate.
        * include/bits/shared_ptr.h (shared_ptr(shared_ptr&&, T*)): Add
        rvalue aliasing constructor.
        (static_pointer_cast, const_pointer, dynamic_pointer_cast)
        (reinterpret_pointer_cast): Add overloads taking rvalues.
        * include/bits/shared_ptr_base.h (__shared_ptr(__shared_ptr&&, T*)):
        Add rvalue aliasing constructor.
        * testsuite/20_util/shared_ptr/casts/1.cc: Change "compile" test to
        "run" and check return values as well as types.
        * testsuite/20_util/shared_ptr/casts/reinterpret.cc: Likewise.
        * testsuite/20_util/shared_ptr/casts/rval.cc: New test.
        * testsuite/20_util/shared_ptr/cons/alias-rval.cc: New test.
        * testsuite/20_util/shared_ptr/cons/alias.cc: Remove unused return
        values.

        * doc/xml/manual/evolution.xml: Document LWG DR 2921 change.
        * doc/xml/manual/intro.xml: Likewise.
        * include/std/future (__create_task_state): Add default arguments
        to make providing an allocator optional.
        (packaged_task::packaged_task(F&&)): Call __create_task_state directly
        instead of delegating to another constructor.
        (packaged_task::packaged_task(allocator_arg_t, const A&, ...)): Do not
        define allocator-extended constructors for C++17 and later.
        * testsuite/30_threads/packaged_task/cons/alloc.cc: Only run test for
        C++11 and C++14.
        * testsuite/30_threads/packaged_task/cons/alloc2.cc: Likewise.
        * testsuite/30_threads/packaged_task/cons/alloc_min.cc: Likewise.
        * testsuite/30_threads/packaged_task/uses_allocator.cc: Likewise.

2019-05-23  Hans-Peter Nilsson  <hp@axis.com>

        * testsuite/26_numerics/random/poisson_distribution/operators/values.cc:
        Don't run the libstdc++/83237 part on simulator targets.

2019-05-23  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2017.xml: Add feature test macro for
        P0040R3.
        * doc/html/*: Regenerate.

        * include/experimental/any (__any_caster): Use RTTI if comparing
        addresses fails, to support non-unique addresses in shared libraries.
        * include/std/any (__any_caster): Likewise.

        PR libstdc++/90220
        * include/experimental/any (__any_caster): Constrain to only be
        callable for object types. Use remove_cv_t instead of decay_t.
        If the type decays or isn't copy constructible, compare the manager
        function to a dummy specialization.
        (__any_caster): Add overload constrained for non-object types.
        (any::_Manager_internal<_Op>): Add dummy specialization.
        * testsuite/experimental/any/misc/any_cast.cc: Test function types
        and array types.

2019-05-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90557
        * src/c++17/fs_path.cc (path::_List::operator=(const _List&)): Fix
        reversed arguments to uninitialized_copy_n.
        * testsuite/27_io/filesystem/path/assign/copy.cc: Check that source
        is unchanged by copy assignment.
        * testsuite/util/testsuite_fs.h (compare_paths): Use std::equal to
        compare path components.

        PR libstdc++/77691
        * include/experimental/memory_resource: Add system header pragma and
        do not define anything unless compiled as C++14 or later.
        (__resource_adaptor_common::__guaranteed_alignment): Remove.
        (__resource_adaptor_imp::do_allocate): If the requested alignment
        is a fundamental alignment then either allocate directly from _M_alloc
        or call the new _M_allocate function.
        (__resource_adaptor_imp::do_deallocate): Likewise for deallocation.
        (__resource_adaptor_imp::_M_allocate): New function that uses a copy
        of the allocator rebound to a POD type with the specified alignment.
        (__resource_adaptor_imp::_M_deallocate): Likewise for deallocation.
        * testsuite/experimental/memory_resource/new_delete_resource.cc:
        Adjust expected allocation sizes.
        * testsuite/experimental/memory_resource/resource_adaptor.cc: Remove
        xfail for Solaris x86.

2019-05-21  Thomas Rodgers  <trodgers@redhat.com>

        LWG 3062 - Unnecessary decay_t in is_execution_policy_v
        * include/pstl/execution_defs.h (__enable_if_execution_policy):
        Use std::__remove_cvref_t when building with GCC.

2019-05-21  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90252
        * testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
        Use "additional_flags" to pass -ltbb to v3_target_compile command.
        Use check_v3_target_prop_cached to cache the result of the test.

        * doc/xml/manual/shared_ptr.xml: Fix names of lock policy constants.

2019-05-20  Thomas Rodgers  <trodgers@redhat.com>

        PR libstdc++/90252
        * testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
        Changed v3_target_compile check from preprocess to executable.
        Added "-ltbb" to v3_target_compile flags.

2019-05-20  Thomas Rodgers  <trodgers@redhat.com>

        * testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
        Add check for Thread Building Blocks 2018 or later.

2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/experimental/names.cc: Only include Networking TS headers
        on targets with the necessary Gthreads support.

2019-05-20  Marek Polacek  <polacek@redhat.com>

        CWG 2094 - volatile scalars are trivially copyable.
        PR c++/85679
        * testsuite/20_util/is_trivially_copyable/value.cc: Change the expected
        result for volatile int.

2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/17_intro/names.cc: Do not check 'ptr' on Solaris.
        * testsuite/experimental/names.cc: Include <experimental/filesystem>
        conditionally.

        PR c++/90532 Ensure __is_constructible(T[]) is false
        * include/std/type_traits (__do_is_default_constructible_impl)
        (__is_default_constructible_atom, __is_default_constructible_safe):
        Remove.
        (is_default_constructible): Use is_constructible.
        * testsuite/20_util/is_constructible/value.cc: Check int[] case.
        * testsuite/20_util/is_default_constructible/value.cc: Likewise.
        * testsuite/20_util/is_trivially_constructible/value.cc: Likewise.
        * testsuite/20_util/is_trivially_default_constructible/value.cc:
        Likewise.

2019-05-20  Pádraig Brady  <pbrady@fb.com>

        * libstdc++-v3/include/ext/new_allocator.h (deallocate): Pass the size
        to the deallocator with -fsized-deallocation.

2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/experimental/memory_resource/new_delete_resource.cc: Fix
        test by passing correct alignment to deallocate function.

2019-05-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90520
        * python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__):
        Raise exception if unique_ptr tuple member has unknown structure.
        * python/libstdcxx/v6/xmethods.py (UniquePtrGetWorker.__call__):
        Adjust worker to support new __uniq_ptr_data base class. Do not
        assume field called _M_head_impl is the first tuple element.

2019-05-17  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_deque.h
        (_Deque_iterator<>::__ptr_to): Remove, use std::__ptr_rebind.
        (_Deque_base(_Deque_base&&, const allocator_type&)): New.
        (_Deque_base::_Deque_impl_data): New.
        (_Deque_base::_Deque_impl): Inherit latter.
        (_Deque_base::_Deque_impl::_M_swap_data): Move...
        (_Deque_base::_Deque_impl_data::_M_swap_data): ... here.
        (_Deque_base::_Deque_impl()): Add noexcept qualification.
        (_Deque_base::_Deque_impl(_Deque_impl&&, _Tp_alloc_type&&)): New.
        (_Deque_base::_Deque_impl::_M_get_Tp_allocator()): Remove static_cast.
        (deque<>::deque()): Default.
        (deque<>::deque(deque&&)): Default.
        (deque<>::deque(deque&&, const allocator_type&, false_type)): New.
        (deque<>::deque(deque&&, const allocator_type&, true_type)): New.
        (deque<>::deque(deque&&, const allocator_type&)): Delegate to latters.
        (deque<>::deque<_It>(_It, _It, const allocator_type&)): Use
        _M_range_initialize.
        (deque<>::assign<_It>(_It, _It)): Use _M_assign_aux.
        (deque<>::resize(size_type, const value_type&)): Share a single
        implementation.
        (deque<>::insert<_It>(const_iterator, _It, _It)): Use
        _M_range_insert_aux.
        [__cplusplus >= 201103L](_M_initialize_dispatch): Remove.
        [__cplusplus >= 201103L](_M_assign_dispatch): Remove.
        [__cplusplus >= 201103L](_M_insert_dispatch): Remove.
        * testsuite/23_containers/deque/allocator/default_init.cc: New.

2019-05-17  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90246
        * include/std/variant (holds_alternative, get, get_if): Improve
        static assertion messages.
        (bad_variant_access::bad_variant_access()): Change default message.
        (__throw_bad_variant_access(bool)): New overload.
        (get): Use new overload.
        (visit, visit<R>): Improve exception message.

        * testsuite/20_util/variant/compile.cc: Fix narrowing test for ILP32
        targets. Add more cases from P0608R3.
        * testsuite/20_util/variant/run.cc: Add more cases from P0608R3.

        * include/bits/random.h (seed_seq::param): Fix non-reserved name.
        * include/experimental/type_traits (is_detected_exact)
        (is_detected_exact_v): Likewise.
        * include/pstl/execution_defs.h (is_execution_policy)
        (is_execution_policy_v, __enable_if_execution_policy): Likewise.
        * include/pstl/execution_impl.h (__policy_traits): Likewise.
        * testsuite/17_intro/names.cc: Check for more non-reserved names.
        * testsuite/experimental/names.cc: New test.

        PR libstdc++/85965
        * include/bits/hashtable.h (_Hashtable::~_Hashtable()): Remove static
        assertions from the destructor.
        * include/bits/hashtable_policy.h (_Hash_code_base::_M_hash_code):
        Move static_assert for hash function to here.
        (_Hash_table_base::_M_equals): Move static_assert for equality
        predicate to here.
        * include/bits/stl_tree.h (_Rb_tree::_S_value(_Const_Link_type)):
        Remove.
        (_Rb_tree::_S_key(_Const_Link_type)): Move assertions here. Access
        the value directly instead of calling _S_value.
        (_Rb_tree::_S_value(_Const_Base_ptr)): Remove.
        (_Rb_tree::_S_key(_Const_Base_ptr)): Do downcast and forward to
        _S_key(_Const_Link_type).
        * testsuite/23_containers/set/85965.cc: Check construction,
        destruction, assignment and size() do not trigger the assertions.
        * testsuite/23_containers/unordered_set/85965.cc: Likewise.
        * testsuite/23_containers/map/48101_neg.cc: Call find and adjust
        expected errors.
        * testsuite/23_containers/multimap/48101_neg.cc: Likewise.
        * testsuite/23_containers/multiset/48101_neg.cc: Likewise.
        * testsuite/23_containers/set/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_map/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_multimap/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_multiset/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_set/48101_neg.cc: Likewise.

        * include/bits/invoke.h [__cplusplus < 201703L] (__invoke_r<void>):
        Use _GLIBCXX14_CONSTEXPR because void functions cannot be constexpr
        in C++11.

        * doc/xml/manual/status_cxx2020.xml: Update P0608R3, P0777R1, and
        P1165R1 entries.
        * doc/html/*: Regenerate.
        * include/std/tuple (make_from_tuple): Use remove_reference_t instead
        of decay_t (P0777R1).

2019-05-17  François Dumont  <fdumont@gcc.gnu.org>

        Move from state of allocators (LWG2593)
        * include/bits/stl_deque.h
        (_Deque_base(_Deque_base&&, false_type)): Remove.
        (_Deque_base(_Deque_base&&, true_type)): Remove.
        (_Deque_base(_Deque_base&&)): Adapt.
        (_Deque_base::_M_move_impl()): Remove.
        * testsuite/util/testsuite_allocator.h
        (propagating_allocator(propagating_allocator&&)): Preserve move from
        state.
        * testsuite/23_containers/deque/allocator/move_assign.cc (test02):
        Adapt.
        * testsuite/23_containers/forward_list/allocator/move_assign.cc (test02):
        Adapt.
        * testsuite/23_containers/list/allocator/move_assign.cc (test02): Adapt.
        * testsuite/23_containers/map/allocator/move_assign.cc (test02): Adapt.
        * testsuite/23_containers/multimap/allocator/move_assign.cc (test02):
        Adapt.
        * testsuite/23_containers/multiset/allocator/move_assign.cc (test02):
        Adapt.
        * testsuite/23_containers/set/allocator/move_assign.cc (test02): Adapt.
        * testsuite/23_containers/unordered_map/allocator/move_assign.cc
        (test02): Adapt.
        * testsuite/23_containers/unordered_multimap/allocator/move_assign.cc
        (test02): Adapt.
        * testsuite/23_containers/unordered_multiset/allocator/move_assign.cc
        (test02): Adapt.
        * testsuite/23_containers/unordered_set/allocator/move_assign.cc
        (test02): Adapt.
        * testsuite/23_containers/vector/allocator/move_assign.cc (test02):
        Adapt.
        * testsuite/23_containers/vector/bool/allocator/move_assign.cc (test02):
        Adapt.
        * testsuite/21_strings/basic_string/allocator/char/move_assign.cc
        (test02): Adapt.
        * testsuite/21_strings/basic_string/allocator/wchar_t/move_assign.cc
        (test02): Adapt.

2019-05-16  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_ops.cc (absolute(const path&, error_code&))
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Remove bogus assertion.

        * include/std/variant (__overload_set): Remove.
        (_Arr): New helper.
        (_Build_FUN): New class template to define a single FUN overload,
        with specializations to prevent unwanted conversions, as per P0608R3.
        (_Build_FUNs): New class template to build an overload set of FUN.
        (_FUN_type): New alias template to perform overload resolution.
        (__accepted_type): Use integer_constant base for failure case. Use
        _FUN_type for successful case.
        (variant::__accepted_index): Use _Tp instead of _Tp&&.
        (variant::variant(_Tp&&)): Likewise.
        (variant::operator=(_Tp&&)): Likewise.

        * include/std/variant (_Variant_storage<false, _Types...>::_M_reset):
        Replace raw visitation with a runtime check for the valueless state
        and a non-raw visitor.
        (_Variant_storage<false, _Types...>::_M_reset_impl): Remove.
        (variant::index()): Remove branch.
        (variant::swap(variant&)): Use valueless_by_exception() instead of
        comparing the index to variant_npos, and add likelihood attribute.

        * include/bits/hashtable_policy.h (_Equal_helper): Remove.
        (_Hashtable_base::_Equal_hash_code): Define new class template.
        (_Hashtable_base::_M_equals): Use _Equal_hash_code instead of
        _Equal_helper.

        * include/bits/hashtable_policy.h (_Hashtable_ebo_helper::_S_get):
        Replace with _M_get non-static member function.
        (_Hashtable_ebo_helper::_S_cget): Replace with _M_cget non-static
        member function.
        (_Hash_code_base, _Local_iterator_base, _Hashtable_base):
        (_Hashtable_alloc): Adjust to use non-static members of EBO helper.

        * include/bits/hashtable_policy.h (_Hash_code_base::_M_swap): Use
        _S_get accessors for members in EBO helpers.
        (_Hash_code_base::_M_extract(), _Hash_code_base::_M_ranged_hash())
        (_Hash_code_base::_M_h1(), _Hash_code_base::_M_h2()): Remove non-const
        overloads.
        (_Hashtable_base::_M_swap): Use _S_get accessors for members in EBO
        helpers.
        (_Hashtable_base::_M_eq()): Remove non-const overload.

2019-05-15  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/variant (visit, visit<R>): Qualify calls to __do_visit.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_allocator.h (NullablePointer::operator bool):
        Fix return value.

2019-05-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        * config/os/solaris/solaris2.10: Move to ...
        * config/os/solaris: ... this.
        * configure.host (os_include_dir): Adapt.
        (abi_baseline_pair): Remove Solaris 10 handling.
        * config/abi/post/i386-solaris2.10: Remove.
        * config/abi/post/sparc-solaris2.10: Remove.
        * config/abi/post/i386-solaris2.11: Rename to ...
        * config/abi/post/i386-solaris: ... this.
        * config/abi/post/sparc-solaris2.11: Rename to ...
        * config/abi/post/sparc-solaris: ... this.

        * libsupc++/new_opa.cc [_GLIBCXX_HAVE_MEMALIGN] [__sun]: Remove
        workaround.

        * testsuite/ext/enc_filebuf/char/13598.cc: Remove *-*-solaris2.10
        xfail.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/variant (__visit_with_index): Remove typedef.
        (__deduce_visit_result): New tag type.
        (__raw_visit, __raw_idx_visit): New helper functions for "raw"
        visitation of possibly-valueless variants, forwarding to __do_visit
        with the relevant tag type.
        (_Variant_storage<false, _Types...>::_M_reset_impl): Use __raw_visit
        and make lambda return void.
        (__variant_construct): Likewise.
        (_Copy_assign_base::operator=, _Move_assign_base::operator=): Use
        __raw_idx_visit and make lambda return void.
        (_Multi_array::__untag_result): Add metafunction to check the function
        pointer type for a tag type that dictates the kind of visitation.
        (_Multi_array<_Ret(*)(_Visitor, _Variants...), __first, __rest...>):
        Use decltype(auto) instead of tagged function pointer type.
        (__gen_vtable_impl): Remove bool non-type parameter and unused
        _Variant_tuple parameter.
        (__gen_vtable_impl::__visit_invoke_impl): Remove.
        (__gen_vtable_impl::__do_visit_invoke): Remove.
        (__gen_vtable_impl::__do_visit_invoke_r): Remove.
        (__gen_vtable_impl::__visit_invoke): Use if-constexpr and __invoke_r
        for the visit<R> case, rather than dispatching to separate functions.
        (_VARIANT_RELATION_FUNCTION_TEMPLATE): Use __raw_idx_visit and make
        lambda return void.
        (variant::swap): Likewise.
        (__do_visit): Replace two non-type template parameters with a single
        type parameter, so that the caller must specify the visitor's return
        type (or one of the tag types).
        (visit): Deduce a return type from the visitor and use the
        __deduce_visit_result tag to enforce that all overloads return the
        same type.
        (visit<R>): Call __do_visit<R> with explicit result type.
        (__variant_hash_call_base_impl::operator()): Use __raw_visit and make
        lambda return void.

2019-05-14  Nina Dinka Ranns  <dinka.ranns@gmail.com>

        nonesuch is insufficiently useless (lwg2996)
        * include/std/type_traits (struct __nonesuch): Added private base
        class to make __nonesuch not an aggregate and removed deleted default
        constructor.
        * include/bits/stl_pair.h (struct __nonesuch_no_braces): Removed.
        (operator=(const pair&)): Use __nonesuch instead of
        __nonesuch_no_braces.
        (operator=(pair&&)): Likewise
        * include/std/tuple (operator=(const tuple&)): Use __nonesuch instead
        of __nonesuch_no_braces.
        (operator=(tuple&&)): Likewise
        * include/experimental/type_traits (struct nonesuch): Added private
        base class to make nonesuch not an aggregate and removed deleted
        default constructor.
        * testsuite/20_util/nonesuch/nonesuch.cc: New.
        * testsuite/experimental/type_traits/nonesuch.cc: New.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/std_function.h (_Simple_type_wrapper): Remove.
        (_Function_handler): Remove partial specializations for void return
        types and pointers to member.
        (_Function_handler::_M_manager): Adapt to removal of
        _Simple_type_wrapper.
        (_Function_handler::_M_invoke): Use __invoke_r instead of __invoke.
        * include/std/functional (_Bind_result::__enable_if_void)
        (_Bind_result::__disable_if_void): Remove sfinae helpers.
        (_Bind_result::__call): Use __invoke_r and remove overloads for void
        return types.
        * include/std/future (__future_base::_Task_state::_M_run)
        (__future_base::_Task_state::_M_run_delayed): Use __invoke_r and
        change return type of lambda expressions.

        * include/bits/invoke.h (__invoke_r): Define new function implementing
        the INVOKE<R> pseudo-function.
        * testsuite/20_util/function_objects/invoke/1.cc: Add more tests.
        * testsuite/20_util/function_objects/invoke/2.cc: New test.

        * include/std/type_traits (__is_nt_convertible_helper): Define it
        unconditionally, not only for C++20.
        (__is_nothrow_convertible): Define internal trait for use in C++11.
        (__is_nt_invocable_impl: Fix by using __is_nothrow_convertible.
        (is_invocable_r_v, is_nothrow_invocable_r_v): Add missing parameter.
        * testsuite/20_util/is_nothrow_convertible/value_ext.cc: New test.
        * testsuite/20_util/is_nothrow_convertible/value.cc: Check with type
        that has nothrow explicit conversion but potentially-throwing implicit
        conversion.
        * testsuite/20_util/is_nothrow_invocable/value.cc: Likewise.
        * testsuite/20_util/is_nothrow_invocable/value_ext.cc: Fix helper
        function to only consider implicit conversions.
        * testsuite/20_util/tuple/cons/noexcept_specs.cc: Add comment.

        * include/std/iterator: Include <iosfwd> instead of <istream> and
        <ostream>.

        * include/bits/stl_tree.h (_Rb_tree::erase(const Key*, const Key*)):
        Remove unused, non-standard function.

        * include/bits/regex.h (match_results::max_size()): Adjust return
        value to account for prefix/suffix/unmatched subs.
        (match_results::_M_resize(unsigned int)): Use _Base_type::assign to
        reset the contained sub matches.
        (match_results::_M_establish_failed_match(_Bi_iter)): Add new member
        function to set result state following a failed match.
        * include/bits/regex.tcc (__regex_algo_impl): Remove loop to set
        sub_match states after _M_resize. Use _M_establish_failed_match.

        PR libstdc++/69724
        * include/std/thread (thread::_State_impl, thread::_S_make_state):
        Replace single _Callable parameter with variadic _Args pack, to
        forward them directly to the tuple of decayed copies.
        * testsuite/30_threads/thread/cons/69724.cc: New test.

2019-05-14  Nina Dinka Ranns  <dinka.ranns@gmail.com>

        Inconsistency wrt Allocators in basic_string assignment (LWG2579)
        * include/bits/basic_string.h: (operator=(const basic_string&):
        Move allocator decision to assign.
        (assign(const basic_string&)): Move allocator decision here.
        * testsuite/21_strings/basic_string/allocator/char/copy_assign.cc:
        Add tests.
        * testsuite/21_strings/basic_string/allocator/wchar_t/copy_assign.cc:
        Add tests.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_allocator.h (memory_resource)
        (default_resource_mgr): Fix indentation.

        * testsuite/20_util/allocator_traits/members/allocate_hint_nonpod.cc:
        Use operator-> to access raw pointer member.
        * testsuite/23_containers/vector/59829.cc: Likewise.
        * testsuite/23_containers/vector/bool/80893.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Use NullablePointer.
        * testsuite/util/testsuite_allocator.h (NullablePointer): New utility
        for tests.
        (PointerBase, PointerBase_void): Derive from NullablePointer and use
        its constructors and equality operators. Change converting
        constructors to use operator-> to access private member of the other
        pointer type.
        (PointerBase_void::operator->()): Add, for access to private member.
        (operator-(PointerBase, PointerBase)): Change to hidden friend.
        (operator==(PointerBase, PointerBase)): Remove.
        (operator!=(PointerBase, PointerBase)): Remove.

        * python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__): Do
        not assume field called _M_head_impl is the first tuple element.
        * testsuite/libstdc++-prettyprinters/compat.cc: Make tuple
        implementation more accurate.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Check unique_ptr with
        empty pointer type and non-empty deleter.

        LWG 2899 - Make is_move_constructible correct for unique_ptr
        * include/bits/unique_ptr.h (__uniq_ptr_impl): Add move constructor,
        move assignment operator.
        (__uniq_ptr_impl::release(), __uniq_ptr_impl::reset(pointer)): Add.
        (__uniq_ptr_data): New class template with conditionally deleted
        special members.
        (unique_ptr, unique_ptr<T[], D>): Change type of data member from
        __uniq_ptr_impl<T, D> to __uniq_ptr_data<T, D>. Define move
        constructor and move assignment operator as defaulted.
        (unique_ptr::release(), unique_ptr<T[], D>::release()): Forward to
        __uniq_ptr_impl::release().
        (unique_ptr::reset(pointer), unique_ptr<T[], D>::reset<U>(U)): Forward
        to __uniq_ptr_impl::reset(pointer).
        * python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__):
        Check for new __uniq_ptr_data type.
        * testsuite/20_util/unique_ptr/dr2899.cc: New test.

2019-05-13  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90454.cc path construction from void*
        * include/bits/fs_path.h (path::_Path): Use remove_pointer so that
        pointers to void are rejected as well as void.
        * include/experimental/bits/fs_path.h (path::_Path): Likewise.
        * testsuite/27_io/filesystem/path/construct/80762.cc: Also check
        pointers to void.
        * testsuite/experimental/filesystem/path/construct/80762.cc: Likewise.

        * doc/xml/manual/policy_data_structures.xml: Comment out stray
        <remark> elements. Fix formatting of bibliography references.

2019-05-13  Edward Smith-Rowland  <3dw4rd@verizon.net>

        * doc/xml/manual/status_cxx2020.xml: Document P0811R3 status.

2019-05-13  Jonathan Wakely  <jwakely@redhat.com>

        Remove Profile Mode, deprecated since 7.1.0
        * doc/Makefile.am: Remove XML file for profile mode docs.
        * doc/Makefile.in: Regenerate.
        * doc/xml/authors.xml: Remove authors of profile mode docs.
        * doc/xml/manual/appendix_contributing.xml: Remove mention of profile
        mode.
        * doc/xml/manual/debug.xml: Likewise.
        * doc/xml/manual/evolution.xml: Document removal of profile mode.
        * doc/xml/manual/profile_mode.xml: Remove profile mode docs.
        * doc/xml/manual/spine.xml: Remove profile mode author credit.
        * doc/xml/manual/test.xml: Remove docs for dg-require-profile-mode
        directive.
        * doc/xml/manual/using.xml: Remove docs for profile mode headers and
        macro.
        * doc/html/*: Regenerate.
        * include/Makefile.am: Remove profile mode headers.
        * include/Makefile.in: Regenerate.
        * include/bits/c++config (std::__profile): Remove namespace.
        [_GLIBCXX_PROFILE]: Remove checks for macro.
        * include/profile/array: Remove.
        * include/profile/base.h: Remove.
        * include/profile/bitset: Remove.
        * include/profile/deque: Remove.
        * include/profile/forward_list: Remove.
        * include/profile/impl/profiler.h: Remove.
        * include/profile/impl/profiler_algos.h: Remove.
        * include/profile/impl/profiler_container_size.h: Remove.
        * include/profile/impl/profiler_hash_func.h: Remove.
        * include/profile/impl/profiler_hashtable_size.h: Remove.
        * include/profile/impl/profiler_list_to_slist.h: Remove.
        * include/profile/impl/profiler_list_to_vector.h: Remove.
        * include/profile/impl/profiler_map_to_unordered_map.h: Remove.
        * include/profile/impl/profiler_node.h: Remove.
        * include/profile/impl/profiler_state.h: Remove.
        * include/profile/impl/profiler_trace.h: Remove.
        * include/profile/impl/profiler_vector_size.h: Remove.
        * include/profile/impl/profiler_vector_to_list.h: Remove.
        * include/profile/iterator_tracker.h: Remove.
        * include/profile/list: Remove.
        * include/profile/map: Remove.
        * include/profile/map.h: Remove.
        * include/profile/multimap.h: Remove.
        * include/profile/multiset.h: Remove.
        * include/profile/ordered_base.h: Remove.
        * include/profile/set: Remove.
        * include/profile/set.h: Remove.
        * include/profile/unordered_base.h: Remove.
        * include/profile/unordered_map: Remove.
        * include/profile/unordered_set: Remove.
        * include/profile/vector: Remove.
        * scripts/run_doxygen: Do not process profile mode headers.
        * testsuite/23_containers/array/element_access/60497.cc: Don't use
        profile mode type.
        * testsuite/23_containers/array/specialized_algorithms/swap_cxx17.cc:
        Remove dg-skip-if for profile mode.
        * testsuite/23_containers/forward_list/capacity/1.cc: Remove
        preprocessor check for profile mode.
        * testsuite/23_containers/list/capacity/29134.cc: Likewise.
        * testsuite/23_containers/map/modifiers/extract.cc: Remove dg-skip-if
        for profile mode.
        * testsuite/23_containers/map/modifiers/insert_or_assign/1.cc:
        Likewise.
        * testsuite/23_containers/map/modifiers/try_emplace/1.cc: Likewise.
        * testsuite/23_containers/multimap/modifiers/extract.cc: Likewise.
        * testsuite/23_containers/multiset/modifiers/extract.cc: Likewise.
        * testsuite/23_containers/set/modifiers/extract.cc: Likewise.
        * testsuite/23_containers/unordered_map/modifiers/extract.cc:
        Likewise.
        * testsuite/23_containers/unordered_multimap/modifiers/extract.cc:
        Likewise.
        * testsuite/23_containers/unordered_multiset/modifiers/extract.cc:
        Likewise.
        * testsuite/23_containers/unordered_set/modifiers/extract.cc:
        Likewise.
        * testsuite/23_containers/vector/bool/capacity/29134.cc: Remove
        preprocessor check for profile mode.
        * testsuite/23_containers/vector/bool/modifiers/insert/31370.cc:
        Likewise.
        * testsuite/23_containers/vector/modifiers/insert_vs_emplace.cc:
        Remove dg-skip-if for profile mode.
        * testsuite/25_algorithms/binary_search/partitioned.cc: Likewise.
        * testsuite/25_algorithms/equal_range/partitioned.cc: Likewise.
        * testsuite/25_algorithms/lexicographical_compare/71545.cc: Likewise.
        * testsuite/25_algorithms/lower_bound/partitioned.cc: Likewise.
        * testsuite/25_algorithms/upper_bound/partitioned.cc: Likewise.
        * testsuite/Makefile.am: Remove profile_flags variable and
        * testsuite/Makefile.am: Remove profile_flags variable and
        check-profile target.
        * testsuite/Makefile.in: Regenerate.
        * testsuite/ext/profile/all.cc: Remove.
        * testsuite/ext/profile/mutex_extensions_neg.cc: Remove.
        * testsuite/ext/profile/profiler_algos.cc: Remove.
        * testsuite/ext/profile/replace_new.cc: Remove.
        * testsuite/ext/throw_allocator/deallocate_global.cc: Remove
        preprocessor check for profile mode.
        * testsuite/ext/throw_allocator/deallocate_local.cc: Likewise.
        * testsuite/lib/libstdc++.exp (check_v3_target_profile_mode): Remove.
        (check_v3_target_normal_mode): Do not check for profile mode macro.
        * testsuite/libstdc++-prettyprinters/80276.cc: Remove dg-skip-if for
        profile mode.
        * testsuite/libstdc++-prettyprinters/compat.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/cxx17.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/debug.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/debug_cxx11.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/simple.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/whatis.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/whatis2.cc: Likewise.

        Remove array_allocator extension, deprecated since 4.9.0
        * doc/xml/manual/allocator.xml: Remove documentation for
        array_allocator.
        * doc/xml/manual/evolution.xml: Document array_allocator removal.
        * doc/xml/manual/using.xml: Remove header from documentation.
        * include/Makefile.am: Remove <ext/array_allocator.h> header.
        * include/Makefile.in: Regenerate.
        * include/ext/array_allocator.h: Remove.
        * include/precompiled/extc++.h: Do not include removed header.
        * testsuite/ext/array_allocator/1.cc: Remove.
        * testsuite/ext/array_allocator/2.cc: Remove.
        * testsuite/ext/array_allocator/26875.cc: Remove.
        * testsuite/ext/array_allocator/3.cc: Remove.
        * testsuite/ext/array_allocator/check_deallocate_null.cc: Remove.
        * testsuite/ext/array_allocator/check_delete.cc: Remove.
        * testsuite/ext/array_allocator/check_new.cc: Remove.
        * testsuite/ext/array_allocator/variadic_construct.cc: Remove.
        * testsuite/ext/headers.cc: Do not include removed header.

2019-05-11  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_bvector.h
        (operator==(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Make hidden friend.
        (operator<(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Likewise.
        (operator!=(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Likewise.
        (operator>(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Likewise.
        (operator<=(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Likewise.
        (operator>=(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Likewise.
        (operator-(const _Bit_iterator_base&, const _Bit_iterator_base&)):
        Likewise.
        (_Bit_iterator::operator+(difference_type)): Likewise and allow NRVO
        copy elision.
        (_Bit_iterator::operator-(difference_type)): Likewise.
        (operator+(ptrdiff_t, const _Bit_iterator&)): Make hidden friend.
        (_Bit_const_iterator::operator+(difference_type)): Likewise and allow
        NRVO copy elision.
        (_Bit_const_iterator::operator-(difference_type)): Likewise.
        (operator+(ptrdiff_t, const _Bit_const_iterator&)): Make hidden friend.

2019-05-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/81266
        * testsuite/util/thread/all.h: Do not use remove_pointer for
        std::thread::native_handle_type.

        PR libstdc++/90397
        * include/std/variant (_Variant_storage<false, Types...>::_M_storage())
        (_Variant_storage<true, Types...>::_M_reset()))
        (_Variant_storage<true, Types...>::_M_storage())): Add noexcept.
        (__get_storage): Likewise.
        (variant): Add noexcept to friend declarations for __get and
        __get_storage.

        PR libstdc++/90388
        * include/bits/unique_ptr.h (default_delete, default_delete<T[]>):
        Use _Require for constraints.
        (operator>(nullptr_t, const unique_ptr<T,D>&)): Implement exactly as
        per the standard.
        (__uniq_ptr_hash): New base class with conditionally-disabled call
        operator.
        (hash<unique_ptr<T,D>>): Derive from __uniq_ptr_hash.
        * testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
        * testsuite/20_util/unique_ptr/hash/90388.cc: New test.

        * include/bits/shared_ptr.h: Improve docs.
        * include/bits/shared_ptr_base.h: Likewise.
        * include/bits/stl_uninitialized.h: Likewise.
        * include/bits/unique_ptr.h: Likewise.
        * libsupc++/new: Likewise.

2019-05-09  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/stl_deque.h
        (operator==(const _Deque_iterator<>&, const _Deque_iterator<>&)):
        Make hidden friend.
        (operator!=(const _Deque_iterator<>&, const _Deque_iterator<>&)):
        Likewise.
        (operator<(const _Deque_iterator<>&, const _Deque_iterator<>&)):
        Likewise.
        (operator<=(const _Deque_iterator<>&, const _Deque_iterator<>&)):
        Likewise.
        (operator>(const _Deque_iterator<>&, const _Deque_iterator<>&)):
        Likewise.
        (operator>=(const _Deque_iterator<>&, const _Deque_iterator<>&)):
        Likewise.
        (_Deque_iterator<>::operator+(difference_type)): Likewise and allow NRVO
        copy elision.
        (_Deque_iterator<>::operator-(difference_type)): Likewise.

2019-05-08  François Dumont  <fdumont@gcc.gnu.org>

        PR libstdc++/90277
        * testsuite/23_containers/unordered_multiset/insert/24061-multiset.cc
        (test01): Reserve for number of insertions to avoid rehash during test.
        * testsuite/23_containers/unordered_multimap/insert/24061-multimap.cc
        (test01): Likewise.
        * testsuite/23_containers/unordered_multimap/insert/24061-multimap.cc
        (test01): Likewise.
        (test02): Likewise.
        (test03): Likewise.

2019-05-08  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/bits/fs_path.h: Improve docs.
        * include/experimental/bits/net.h: Fix wrong header name in comment.
        Do not document implementation details.
        * include/experimental/netfwd: Fix doxygen grouping.

2019-05-07  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_pair.h: Improve docs.
        * include/std/tuple: Likewise.

        * doc/doxygen/doxygroups.cc (std::literals): Add documentation for
        inline namespace.
        * include/std/chrono: Improve docs.
        * include/std/ratio: Do not document implementation details.
        * testsuite/20_util/ratio/cons/cons_overflow_neg.cc: Adjust dg-error
        line numbers.
        * testsuite/20_util/ratio/operations/ops_overflow_neg.cc: Likewise.

        PR libstdc++/89102
        * doc/xml/manual/intro.xml: Document DR 2408 and 2465 changes.
        * include/std/chrono (__duration_common_type_wrapper): Replace with ...
        (__duration_common_type): New helper.
        (common_type<chrono::duration<R1, P2>, chrono::duration<R2, P2>>): Use
        __duration_common_type.
        (__timepoint_common_type_wrapper): Replace with ...
        (__timepoint_common_type): New helper.
        (common_type<chrono::time_point<C, D2>, chrono::time_point<C, D2>>):
        Use __time_point_common_type.
        * include/std/type_traits (common_type<>): Define, as per LWG 2408.
        (__common_type_impl): If either argument is transformed by decay,
        use the common_type of the decayed types.
        (__common_type_impl<_Tp, _Up, _Tp, _Up>): If the types are already
        decayed, use __do_common_type_impl to get the common_type.
        (common_type<_Tp>): Use common_type<_Tp, _Tp>.
        (__do_member_type_wrapper, __member_type_wrapper)
        (__expanded_common_type_wrapper): Remove.
        (__common_type_pack, __common_type_fold): New helpers.
        (common_type<_Tp, _Up, _Vp...>): Use new helpers instead of
        __member_type_wrapper and __expanded_common_type_wrapper.
        * testsuite/20_util/common_type/requirements/explicit_instantiation.cc:
        Test zero-length template argument list.
        * testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
        Test single argument cases and argument types that should decay.
        * testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
        Adjust expected error.
        * testsuite/20_util/duration/literals/range_neg.cc: Use zero for
        dg-error lineno.
        * testsuite/20_util/duration/requirements/typedefs_neg1.cc: Likewise.
        * testsuite/20_util/duration/requirements/typedefs_neg2.cc: Likewise.
        * testsuite/20_util/duration/requirements/typedefs_neg3.cc: Likewise.

        * doc/xml/manual/intro.xml: Fix DR 2537 and DR 2566 confusion.

2019-05-01  Nina Dinka Ranns  <dinka.ranns@gmail.com>

        Make allocator propagation more consistent for
        operator+(basic_string) (P1165R1)
        * include/bits/basic_string.h
        (operator+(basic_string&&, basic_string&&): Changed resulting
        allocator to always be the one from the first parameter.
        * include/bits/basic_string.tcc
        (operator+(const _CharT*, const basic_string&)): Changed
        resulting allocator to be SOCCC on the second parameter's allocator.
        (operator+(_CharT, const basic_string&)): Likewise.
        * testsuite/21_strings/basic_string/allocator/char/operator_plus.cc:
        New.
        * testsuite/21_strings/basic_string/allocator/wchar_t/operator_plus.cc:
        New.

2019-05-07  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/regex.h: Improve docs.
        * include/bits/regex.tcc: Do not document implementation details.

        * testsuite/19_diagnostics/error_code/hash.cc: New test.

2019-05-06  François Dumont  <fdumont@gcc.gnu.org>

        * python/libstdcxx/v6/printers.py (add_one_template_type_printer):
        Add type printer for container types in std::__debug namespace.
        * testsuite/lib/gdb-test.exp (whatis-regexp-test): New.
        (gdb-tests): Use distinct parameters for the type of test and use of
        regex.
        (gdb-test): Check for regex test even if 'whatis' test.
        * testsuite/libstdc++-prettyprinters/80276.cc: Adapt for _GLIBCXX_DEBUG
        mode.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/cxx17.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/simple.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/whatis.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/whatis2.cc: Likewise.

2019-05-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/system_error (error_category): Fix comment.

        PR libstdc++/90299
        * src/c++17/fs_ops.cc (absolute(const path&)): Report an error if the
        argument is an empty path.
        (absolute(const path&, error_code&)): Use invalid_argument as error
        code instead of no_such_file_or_directory.
        * testsuite/27_io/filesystem/operations/absolute.cc: Check handling
        of non-existent paths and empty paths with both overloads of absolute.

        * include/std/system_error (error_category, error_code)
        (error_condition): Improve docs.
        * libsupc++/exception: Add missing @addtogroup Doxygen command.
        * libsupc++/exception_ptr.h (exception_ptr): Link equality operators
        to class documentation. Suppress documentation for implementation
        details.
        * libsupc++/nested_exception.h (throw_with_nested, rethrow_if_nested):
        Suppress documentation for implementation details.

        * include/std/system_error (error_code): Remove friend declaration
        for hash<error_code>.
        (hash<error_code>::operator()): Use public member functions to access
        value and category.
        (hash<error_condition>::operator()): Use address of category, not
        its object representation.
        * src/c++11/compatibility-c++0x.cc (hash<error_code>::operator()):
        Use public member functions to access value and category.
        * testsuite/19_diagnostics/error_condition/hash.cc: New test.

2019-05-04  François Dumont  <fdumont@gcc.gnu.org>

        * include/bits/hashtable.h (_Hashtable<>::rehash): Review comment.
        * include/bits/hashtable_policy.h
        (_Prime_rehash_policy::_M_bkt_for_elements): Use __builtin_ceill.
        (_Power2_rehash_policy::_M_bkt_for_elements): Likewise.
        (_Power2_rehash_policy::_M_next_bkt): Enforce returning a result not
        smaller than input value rather than always greater. Preserve
        _M_next_resize if called with 0 input. Use __builtin_floorl.
        (_Power2_rehash_policy::_M_need_rehash): Rehash only if number of
        elements + number of insertions is greater than _M_next_resize. Start
        with 11 buckets if not told otherwise. Use __builtin_floorl.
        (_Rehash_base<>::reserve): Use rehash policy _M_bkt_for_elements.
        * src/c++11/hashtable_c++0x.cc (_Prime_rehash_policy::_M_next_bkt):
        Preserve _M_next_resize if called with 0 input. Use __builtin_floorl.
        (_Prime_rehash_policy::_M_need_rehash): Start with 11 buckets if not
        told otherwise. Use __builtin_floorl.
        * testsuite/23_containers/unordered_set/hash_policy/71181.cc: Adapt test
        to also validate _Power2_rehash_policy.
        * testsuite/23_containers/unordered_set/hash_policy/power2_rehash.cc:
        Adapt.

2019-05-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/61761
        * testsuite/26_numerics/complex/proj.cc: Don't assume <cmath> defines
        std::copysign.

        PR libstdc++/52119
        * include/ext/numeric_traits.h (__glibcxx_min): Avoid integer
        overflow warning with -Wpedantic -Wsystem-headers.

2019-05-02  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90314
        * include/bits/c++config (_GLIBCXX_NOEXCEPT_IF): Use variadic macro.
        * include/bits/move.h (swap): Remove extra parentheses.

        * include/experimental/bits/lfts_config.h: Improve doc markup.
        * include/experimental/optional: Improve docs.
        (_Has_addressof_mem, _Has_addressof_free, _Has_addressof)
        (__constexpr_addressof): Remove.
        (optional::operator->()): Use std::__addressof().
        * include/std/optional (optional::operator->()): Adjust whitespace.
        * testsuite/experimental/optional/constexpr/observers/2.cc: Check
        that operator-> is still constexpr with overloaded operator&. Change
        to compile-only test.
        * testsuite/experimental/optional/constexpr/observers/3.cc: Change to
        compile-only test.

        * include/bits/shared_ptr.h: Improve docs.
        * include/bits/shared_ptr_atomic.h: Likewise.
        * include/bits/unique_ptr.h: Likewise. Adjust whitespace.

        * include/bits/basic_string.h: Fix iterator/index confusion in
        Doxygen comments.
        * include/bits/range_access.h: Fix Doxygen warnings.
        * include/bits/refwrap.h: Do not document implementation details.
        (ref, cref): Group docs with reference_wrapper.
        * include/std/fstream: Fix Doxygen markup.
        * libsupc++/initializer_list (begin, end): Group docs with
        initializer_list.

        * doc/doxygen/user.cfg.in: Set MARKDOWN_SUPPORT=YES.

        * include/bits/unique_lock.h: Fix/improve doxygen markup.
        * include/std/mutex: Likewise.
        * include/std/shared_mutex: Likewise.

        * include/bits/fs_dir.h: Fix/improve doxygen markup.
        * include/bits/fs_fwd.h: Likewise.
        * include/bits/fs_ops.h: Likewise.
        * include/bits/fs_path.h: Likewise.
        * include/std/filesystem: Likewise.

        * include/experimental/bits/net.h: Fix/improve doxygen markup.
        * include/experimental/buffer: Likewise.
        * include/experimental/executor: Likewise.
        * include/experimental/internet: Likewise.
        * include/experimental/io_context: Likewise.
        * include/experimental/net: Likewise.
        * include/experimental/netfwd: Likewise.
        * include/experimental/socket: Likewise.
        * include/experimental/timer: Likewise.

        * doc/doxygen/doxygroups.cc: Move description of experimental group
        here.
        * include/experimental/algorithm: Add to libfund-ts doc group.
        * include/experimental/any: Likewise. Do not document implementation
        details.
        * include/experimental/array: Add to libfund-ts doc group.
        * include/experimental/bits/lfts_config.h: Define libfund-ts doc group
        for Library Fundamentals.
        * include/experimental/chrono: Add to libfund-ts doc group.
        * include/experimental/deque: Likewise.
        * include/experimental/forward_list: Likewise.
        * include/experimental/functional: Likewise.
        * include/experimental/iterator: Likewise.
        * include/experimental/list: Likewise.
        * include/experimental/map: Likewise.
        * include/experimental/memory: Likewise.
        * include/experimental/memory_resource: Likewise. Improve docs.
        details.
        * include/experimental/numeric: Add to libfund-ts doc group.
        * include/experimental/optional: Likewise.
        * include/experimental/propagate_const: Likewise.
        * include/experimental/random: Likewise.
        * include/experimental/ratio: Likewise.
        * include/experimental/regex: Likewise.
        * include/experimental/set: Likewise.
        * include/experimental/source_location: Likewise.
        * include/experimental/string: Likewise.
        * include/experimental/string_view: Likewise.
        * include/experimental/system_error: Likewise.
        * include/experimental/tuple: Likewise.
        * include/experimental/type_traits: Likewise.
        * include/experimental/unordered_map: Likewise.
        * include/experimental/unordered_set: Likewise.
        * include/experimental/utility: Likewise.
        * include/experimental/vector: Likewise.
        * testsuite/experimental/any/misc/any_cast_neg.cc: Adjust dg-error.
        * testsuite/experimental/array/neg.cc: Adjust dg-error.
        * testsuite/experimental/propagate_const/assignment/move_neg.cc:
        Likewise.
        * testsuite/experimental/propagate_const/cons/move_neg.cc: Likewise.
        * testsuite/experimental/propagate_const/requirements2.cc: Likewise.
        * testsuite/experimental/propagate_const/requirements3.cc: Likewise.
        * testsuite/experimental/propagate_const/requirements4.cc: Likewise.
        * testsuite/experimental/propagate_const/requirements5.cc: Likewise.

        * include/experimental/bits/fs_dir.h: Fix Doxygen markup.
        * include/experimental/bits/fs_fwd.h: Improve docs.
        * include/experimental/bits/fs_ops.h: fix Doxygen markup.
        * include/experimental/bits/fs_path.h: Likewise.
        (path, filesystem_error, u8path): Improve docs.
        * include/experimental/filesystem: Link to docs for TS.

        * config/allocator/new_allocator_base.h (__allocator_base): Add
        workaround for Doxygen bug #6945.
        * include/std/memory: Improve docs. Define group for pointer safety.
        * include/std/scoped_allocator: Improve docs. Use "undocumented"
        conditional to suppress documentation for implementation details.

        * include/bits/specfun.h: Improve docs.
        * include/tr1/cmath: Likewise. Fix nesting of preprocessor conditions
        and namespaces.

        * doc/doxygen/doxygroups.cc (std::tr2, std::__gnu_cxx): Improve docs.
        (std::experimental): Add docs.
        * doc/doxygen/user.cfg.in (PREDEFINED): Expand macros for __cxx11
        namespace to nothing when generating docs.
        * include/bits/regex_constants.h (std::regex_constants): Improve docs.
        * include/std/chrono (std::chrono): Likewise.
        * include/std/functional (std::placeholders): Likewise.
        * include/std/thread (std::this_thread): Likewise.

        * include/parallel/settings.h: Fix Doxygen markup.

        * include/ext/pb_ds/detail/bin_search_tree_/*_imps.hpp: Do not define
        anything unless PB_DS_CLASS_C_DEC is defined.
        * include/ext/pb_ds/detail/binary_heap_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/binomial_heap_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/binomial_heap_base_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/cc_hash_table_map_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/gp_hash_table_map_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/hash_fn/*_imp.hpp: Likewise.
        * include/ext/pb_ds/detail/left_child_next_sibling_heap_/*_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/list_update_map_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/ov_tree_map_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/pairing_heap_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/pat_trie_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/rb_tree_map_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/rc_binomial_heap_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/resize_policy*_imp.hpp: Likewise.
        * include/ext/pb_ds/detail/splay_tree_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/thin_heap_/*_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/trie_policy*_imp.hpp: Likewise.
        * include/ext/pb_ds/detail/unordered_iterator/const_iterator.hpp:
        Likewise.
        * include/ext/pb_ds/detail/unordered_iterator/iterator.hpp: Likewise.
        * include/ext/pb_ds/detail/unordered_iterator/point_const_iterator.hpp:
        Likewise.
        * include/ext/pb_ds/detail/unordered_iterator/point_iterator.hpp:
        Likewise.

        * doc/doxygen/user.cfg.in: Regenerate with Doxygen 1.8.14 and set
        GROUP_NESTED_COMPOUNDS=YES and SORT_BY_SCOPE_NAME=NO. Add various
        _GLIBCXX_xxx macros and __attribute__(X) to PREDEFINED macros that
        Doxygen expands.

2019-05-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        * config/abi/post/i386-solaris2.10/baseline_symbols.txt: Regenerate.
        * config/abi/post/i386-solaris2.10/amd64/baseline_symbols.txt: Likewise.
        * config/abi/post/i386-solaris2.11/baseline_symbols.txt: Likewise.
        * config/abi/post/i386-solaris2.11/amd64/baseline_symbols.txt: Likewise.
        * config/abi/post/sparc-solaris2.10/baseline_symbols.txt: Likewise.
        * config/abi/post/sparc-solaris2.10/sparcv9/baseline_symbols.txt:
        Likewise.
        * config/abi/post/sparc-solaris2.11/baseline_symbols.txt: Likewise.
        * config/abi/post/sparc-solaris2.11/sparcv9/baseline_symbols.txt:
        Likewise.

2019-05-01  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/61761
        * include/std/complex (__complex_proj): Return parameter unchanged.
        [_GLIBCXX_USE_C99_COMPLEX] (__complex_proj): Change overloads for
        floating-point types to take std::complex arguments.
        [_GLIBCXX_USE_C99_MATH_TR1] (__complex_proj): Add overloads for
        floating-point types.
        * testsuite/26_numerics/complex/proj.cc: New test.

2019-04-30  Jakub Jelinek  <jakub@redhat.com>

        * config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Change _Lock_policyE2 exports
        to _Lock_policyE[012].
        * config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2019-04-30  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/27_io/filesystem/path/decompose/root_path.cc: Remove
        macros accidentally left in.
        * testsuite/27_io/filesystem/path/native/string-char8_t.cc: Remove
        unnecessary -lstdc++fs option. Fix test for mingw.
        * testsuite/experimental/filesystem/path/native/string-char8_t.cc:
        Fix test for mingw.

2019-04-30  Jakub Jelinek  <jakub@redhat.com>

        * config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2019-04-29  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_algo.h (generate_n): Adjust doxygen comment.

        * include/bits/move.h (swap(T&, T&), swap(T (&)[N], T (&)[N])): Use
        _GLIBCXX_NOEXCEPT_IF to simplify declarations.

        PR libstdc++/71312
        * src/c++11/shared_ptr.cc (get_mutex): Align pool mutexes to 64 bytes.

        * include/bits/stl_bvector.h (vector<bool>::empty()): Add nodiscard
        attribute.

        * include/bits/stl_iterator_base_types.h (_Iter_base): Remove unused
        class template and partial specialization.

        PR libstdc++/87982
        * include/bits/stl_algo.h (generate_n): Convert _Size parameter to
        an integral type.
        * include/bits/stl_algobase.h (__size_to_integer): New overloaded
        functions to convert a value to an integral type.
        (__fill_n_a, __fill_n_a): Assert that __n is already an integral type.
        (fill_n): Convert _Size parameter to an integral type.
        * testsuite/25_algorithms/fill_n/87982.cc: New test.
        * testsuite/25_algorithms/fill_n/87982_neg.cc: New test.
        * testsuite/25_algorithms/fill_n/dr426.cc: New test.
        * testsuite/25_algorithms/generate_n/87982.cc: New test.
        * testsuite/25_algorithms/generate_n/87982_neg.cc: New test.
        * testsuite/25_algorithms/generate_n/dr426.cc: New test.

2019-04-28  Nina Dinka Ranns  <dinka.ranns@gmail.com>

        Adding noexcept-specification on tuple constructors (LWG 2899)
        * libstdc++-v3/include/std/tuple:
        (tuple()): Add noexcept-specification.
        (tuple(const _Elements&...)): Likewise
        (tuple(_UElements&&...)): Likewise
        (tuple(const tuple<_UElements...>&)): Likewise
        (tuple(tuple<_UElements...>&&)): Likewise
        (tuple(const _T1&, const _T2&)): Likewise
        (tuple(_U1&&, _U2&&)): Likewise
        (tuple(const tuple<_U1, _U2>&): Likewise
        (tuple(tuple<_U1, _U2>&&): Likewise
        (tuple(const pair<_U1, _U2>&): Likewise
        (tuple(pair<_U1, _U2>&&): Likewise
        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs.cc: New

2019-04-27  Marc Glisse  <marc.glisse@inria.fr>

        PR libstdc++/87106
        * include/bits/stl_uninitialized.h (__relocate_object_a): Mark the
        arguments with __restrict.

2019-04-26  H.J. Lu  <hongjiu.lu@intel.com>

        * config/abi/post/x86_64-linux-gnu/x32/baseline_symbols.txt: Updated.

2019-04-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/bits/fs_path.h
        (path::_S_convert_loc<_InputIterator>): Create const std::string to
        avoid redundant call to _S_convert_loc with non-const pointers.

        * testsuite/20_util/variant/run.cc: Use a new Hashable type to test
        hashing, because pmr::string depends on _GLIBCXX_USE_CXX11_ABI==1.
        * testsuite/21_strings/basic_string/hash/hash.cc
        [!_GLIBCXX_USE_CXX11_ABI]: Don't test pmr strings.
        * testsuite/21_strings/basic_string/hash/hash_char8_t.cc
        [!_GLIBCXX_USE_CXX11_ABI]: Likewise.

        * config/abi/pre/gnu.ver (GLIBCXX_3.4): Replace wildcard that matches
        wstring::_M_replace_dispatch with more specific patterns.
        * include/bits/fs_path.h (path::_S_convert_loc<_InputIterator>):
        Create const std::string to avoid redundant call to _S_convert_loc
        with non-const pointers.
        * include/bits/locale_conv.h (__do_str_codecvt): Use if-constexpr to
        avoid unnecessary basic_string::assign instantiations.

        * include/std/memory (__uses_alloc_args): Add string-literal to
        static_assert, to match the one in __uses_alloc.
        [__cpp_concepts] (_Std_pair): Use C++2a syntax for concept.
        * testsuite/20_util/polymorphic_allocator/construct_c++2a.cc: Check
        for recursive uses-allocator construction of nested pairs.
        * testsuite/20_util/scoped_allocator/construct_pair_c++2a.cc:: Add
        comment.

2019-04-26  Jakub Jelinek  <jakub@redhat.com>

        * config/abi/post/s390x-linux-gnu/32/baseline_symbols.txt: Update.
        * config/abi/post/s390-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/powerpc-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt: Update.

        * config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/x86_64-linux-gnu/32/baseline_symbols.txt: Update.
        * config/abi/post/i386-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/i486-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Update.
        * config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.

2019-04-25  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90239
        * doc/xml/manual/status_cxx2020.xml: Amend P0591R4 status.
        * include/std/scoped_allocator [__cplusplus > 201703L]
        (scoped_allocator_adaptor::construct): Define in terms of
        uses_allocator_construction_args, as per P0591R4.
        * testsuite/20_util/scoped_allocator/construct_pair_c++2a.cc: New test.
        * testsuite/util/testsuite_allocator.h: Remove name of unused
        parameter.

2019-04-24  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2017.xml: Document P0024R2 status.
        * doc/html/*: Regenerate.

        * include/bits/fs_path.h (operator<, operator<=, operator>)
        (operator>=, operator==, operator!=): Make hidden friends, as per
        LWG 3065.
        * testsuite/27_io/filesystem/path/native/string-char8_t.cc: Fix
        string type in test.
        * testsuite/27_io/filesystem/path/native/string.cc: Likewise.

        * include/std/any (any::any(ValueType&&)): Use __and_v.
        * include/std/numeric (midpoint(T, T, T), midpoint(T*, T*, T*)):
        Likewise.

        * include/std/tuple (apply): Use remove_reference_t instead of decay_t
        as per P0777R1.
        * include/std/type_traits (__result_of_memfun): Use remove_reference
        instead of __remove_cvref_t and remove redundant is_same check.
        (__inv_unwrap): Use __remove_cvref_t instead of decay_t.

        * include/experimental/string_view (basic_string_view::pointer)
        (basic_string_view::reference): Fix to refer to non-const value_type.
        * include/bits/basic_string.h (basic_string): Use __sv_check and
        __sv_limit instead of basic_string_view::_M_check and
        basic_string_view::_M_limit.
        * include/std/string_view (__sv_check, __sv_limit): New
        helper functions to replace basic_string_view::_M_check and
        basic_string_view::_M_limit.
        (basic_string_view): Add static assertions to enforce ill-formed
        requirement for traits_type::char_type from P1148R0, and to enforce
        required properties of char-like types.
        (basic_string_view::pointer, basic_string_view::reference): Fix to
        refer to non-const value_type.
        (basic_string_view::operator[], basic_string_view::at)
        (basic_string_view::front, basic_string_view::back)
        (basic_string_view::data): Use const_reference and const_pointer
        typedefs for return types.
        (basic_string_view::_M_check, basic_string_view::_M_limit): Remove.
        (hash<wstring_view>): Fix argument_type typedef.
        * testsuite/21_strings/basic_string_view/modifiers/remove_prefix/
        char/1.cc: Fix expected return type of basic_string_view::data().
        * testsuite/21_strings/basic_string_view/modifiers/remove_prefix/
        wchar_t/1.cc: Likewise.
        * testsuite/21_strings/basic_string_view/modifiers/remove_suffix/
        char/1.cc: Likewise.
        * testsuite/21_strings/basic_string_view/modifiers/remove_suffix/
        wchar_t/1.cc: Likewise.
        * testsuite/21_strings/basic_string_view/requirements/traits_neg.cc:
        New test.
        * testsuite/21_strings/basic_string_view/requirements/typedefs.cc:
        Check reference and pointer typedefs.
        * testsuite/experimental/string_view/requirements/typedefs.cc:
        Likewise.
        * testsuite/experimental/string_view/modifiers/remove_prefix/char/1.cc:
        Fix expected return type of basic_string_view::data().
        * testsuite/experimental/string_view/modifiers/remove_prefix/wchar_t/
        1.cc: Likewise.
        * testsuite/experimental/string_view/modifiers/remove_suffix/char/1.cc:
        Likewise.
        * testsuite/experimental/string_view/modifiers/remove_suffix/wchar_t/
        1.cc: Likewise.

        PR libstdc++/90220
        * include/std/any (__any_caster): Use remove_cv_t instead of decay_t.
        Avoid a runtime check for types that can never be stored in std::any.
        * testsuite/20_util/any/misc/any_cast.cc: Test std::any_cast with
        array types.

        PR libstdc++/90220 (partial)
        * include/std/any (any_cast<T>(any*), any_cast<T>(const any*)): Do
        not attempt ill-formed static_cast to pointers to non-object types.
        * testsuite/20_util/any/misc/any_cast.cc: Test std::any_cast with
        function types.

        * testsuite/20_util/variant/run.cc: Catch exception by reference to
        prevent -Wcatch-value warning.

        * include/std/variant (__variant_construct): Use template parameter
        type instead of equivalent decltype-specifier.
        (_Move_ctor_base<false, Types...>::_Move_ctor_base(_Move_ctor_base&&)):
        Replace forward with move.
        (_Move_ctor_base<false, Types...>::_M_destructive_move)
        (_Move_ctor_base<false, Types...>::_M_destructive_copy)
        (_Move_ctor_base<true, Types...>::_M_destructive_move)
        (_Move_ctor_base<true, Types...>::_M_destructive_copy): Only set the
        index after construction succeeds.
        (_Copy_assign_base<false, Types...>::operator=): Remove redundant
        if-constexpr checks that are always true. Use __remove_cvref_t instead
        of remove_reference so that is_nothrow_move_constructible check
        doesn't use a const rvalue parameter. In the potentially-throwing case
        construct a temporary and move assign it, as per LWG 2904.
        (_Move_assign_base<false, Types...>::operator=): Remove redundant
        if-constexpr checks that are always true. Use emplace as per LWG 2904.
        (variant::operator=(T&&)): Only use emplace conditionally, otherwise
        construct a temporary and move assign from it, as per LWG 2904.
        * testsuite/20_util/variant/exception_safety.cc: Check that
        assignment operators have strong exception safety guarantee.

2019-04-23  Thomas Rodgers <trodgers@redhat.com>

        Document PSTL linker flags

        * doc/xml/manual/using.xml: Add PSTL linker flags to table 3.1.
        
2019-04-23  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/variant (__detail::__variant::_Traits): Make
        _S_trivial_copy_assign depend on _S_trivial_copy_ctor and make
        _S_trivial_move_assign depend on _S_trivial_move_ctor, as per
        P0602R4.
        (__detail::__variant::_Copy_assign_alias): Only depend on
        _S_trivial_copy_assign, which subsumes _S_trivial_copy_ctor now.
        * testsuite/20_util/variant/compile.cc: Correct checks for trivial
        move assignment operators.

        PR libstdc++/90165
        * include/std/variant (variant::__not_self): New helper for the
        is_same_v<remove_cvref_t<T>, variant>==false constraints.
        (variant::__to_type_impl): Remove.
        (variant::__to_type): Add default argument to check pack size, instead
        of using __to_type_impl.
        (variant::__accepted_type): Add default argument using __not_self.
        (variant::__is_in_place_tag, variant::__not_in_place_tag): New helpers
        for variant(T&&) constructor constraint.
        (variant::variant(T&&)): Use __not_in_place_tag in constraints.
        Extract __accepted_type into a named template parameter for reuse in
        other constraints and in the exception specification.
        (variant::variant(in_place_type_t<T>, Args&&...))
        (variant::variant(in_place_type_t<T>, initializer_list<U>, Args&&...))
        (variant::variant(in_place_index_t<T>, Args&&...))
        (variant::variant(in_place_index_t<T>, initializer_list<U>, Args&&...))
        (variant::operator=T&&)): Remove redundant && from trait arguments.
        * testsuite/20_util/variant/compile.cc: Check variant(T&&) constructor
        isn't used for in_place_type or in_place_index arguments.

        * include/std/type_traits (unwrap_reference_t): Define for C++2a.
        (unwrap_ref_decay): Remove inheritance from unwrap_reference.
        * testsuite/20_util/unwrap_reference/1.cc: Adjust test to use alias.

2019-04-23  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
            Bernd Edlinger  <bernd.edlinger@hotmail.de>
            Jakub Jelinek  <jakub@redhat.com>

        PR target/89093
        * libsupc++/eh_personality.cc (PERSONALITY_FUNCTION): Add
        general-regs-only target attribute for ARM.

2019-04-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/87431
        * include/bits/basic_string.h (_Never_valueless_alt): Make partial
        specialization also depend on is_nothrow_move_constructible.
        * include/std/variant (__detail::__variant::__never_valueless()):
        Only true if the variant would have a move assignment operator.
        (__detail::__variant::_Variant_storage<false, T...>::_M_valid()):
        Check __never_valueless<T...>().
        (variant::emplace): Only perform non-throwing move assignments
        for never-valueless alternatives if the variant has a move assignment
        operator.
        * testsuite/20_util/variant/compile.cc: Check that never-valueless
        types can be emplaced into non-assignable variants.
        * testsuite/20_util/variant/run.cc: Check that never-valueless types
        don't get copied when emplaced into non-assignable variants.

        * include/std/variant (__detail::__variant::__ref_cast): Remove
        unused function.
        (__detail::__variant::_Uninitialized::_M_get)
        (__detail::__variant::__get)
        (__gen_vtable_impl::__element_by_index_or_cookie): Add noexcept.

2019-04-21  Iain Sandoe  <iain@sandoe.co.uk>

        * testsuite/17_intro/headers/c++1998/charset.cc: Skip for Darwin8
        to Darwin10.
        * testsuite/17_intro/headers/c++2011/charset.cc: Likewise.
        * testsuite/17_intro/headers/c++2014/charset.cc: Likewise.
        * testsuite/17_intro/headers/c++2017/charset.cc: Likewise.
        * testsuite/17_intro/headers/c++2020/charset.cc: Likewise.

2019-04-20  Thomas Rodgers <trodgers@redhat.com>

        Delegate PSTL configuration to pstl/pstl_config.h

        * include/bits/c++config: Remove explicit PSTL configuration
        macros and use definitions from <pstl/pstl_config.h>.
        
2019-04-20  Thomas Rodgers <trodgers@redhat.com>

        Cleanup algorithm implementations
        * include/pstl/glue_algorithm_impl.h (stable_sort): Forward
        execution policy.
        (mismatch): Forward execution policy.
        (equal): Qualify call to std::equal().
        (partial_sort): Forward execution policy.
        (inplace_merge): Forward execution policy.
        
2019-04-19  Thomas Rodgers <trodgers@redhat.com>
        
        Improve implementation of parallel equal()
        * include/pstl/algorithm_impl.h
        (__internal::__brick_equal): use "4 iterator" version of
        std::equal().
        (__internal::__brick_equal): use simd for random access
        iterators on unsequenced execution policies.
        (__internal::__pattern_equal): add "4 iterator" version
        (__internal::__pattern_equal): dispatch to simd __brick_equal
        for vector-only execution policies.
        (__internal::__pattern_equal): dispatch to __parallel_or for
        parallel execution policies.
        * include/pstl/glue_algorithm_impl.h
        (std::equal): dispatch to "4 iterator" version of
        __internal::__pattern_equal().
        
2019-04-17  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90105
        * include/bits/forward_list.h (operator==): Do not use operator!= to
        compare elements.
        (forward_list<T, A>::sort(Comp)): When elements are equal take the one
        earlier in the list, so that sort is stable.
        * testsuite/23_containers/forward_list/operations/90105.cc: New test.
        * testsuite/23_containers/forward_list/comparable.cc: Test with
        types that meet the minimum EqualityComparable and LessThanComparable
        requirements. Remove irrelevant comment.

        * include/std/variant (__detail::__variant::_Traits::_S_copy_assign):
        Do not depend on whether all alternative types are move constructible.
        (__detail::__variant::_Copy_assign_base::operator=): Remove cv-quals
        from the operand when deciding whether to perform the assignment.
        * testsuite/20_util/variant/compile.cc (DeletedMoves): Define type
        with deleted move constructor and deleted move assignment operator.
        (default_ctor, copy_ctor, move_ctor, copy_assign, move_assign): Check
        behaviour of variants with DeletedMoves as an alternative.
        * testsuite/20_util/variant/run.cc (DeletedMoves): Define same type.
        (move_ctor, move_assign): Check that moving a variant with a
        DeletedMoves alternative falls back to copying instead of moving.

        * testsuite/20_util/variant/compile.cc: Remove empty string literals
        from static_assert declarations.

        * testsuite/20_util/variant/compile.cc (MoveCtorOnly): Fix type to
        actually match its name.
        (MoveCtorAndSwapOnly): Define new type that adds swap to MoveCtorOnly.
        (test_swap()): Fix result for MoveCtorOnly and check
        MoveCtorAndSwapOnly.

        * include/std/optional (optional::value_or(U&&) &&): Add missing
        constexpr specifier.
        * testsuite/20_util/optional/constexpr/observers/4.cc: Check value_or
        for disengaged optionals and rvalue optionals.
        * testsuite/20_util/optional/observers/4.cc: Likewise.

2019-04-12  Thomas Rodgers  <trodgers@redhat.com>
        
        * include/pstl/algorithm_impl.h: Uglify identfiers.
        * include/pstl/numeric_impl.h:  Uglify identfiers.
        * include/pstl/parallel_backend_tbb.h: Uglify identfiers.

2019-04-11  Thomas Rodgers  <trodgers@redhat.com>

        * include/bits/c++config:
        Add definition for __PSTL_ASSERT.
        Add definition for __PSTL_ASSERT_MSG.
        * include/pstl/algorithm_impl.h: Replace use of assert().
        * include/pstl/numeric_impl.h: Replace use of assert().
        * include/pstl/parallel_backend_tbb.h:
        Replace use of assert().
        Replace use of __TBB_ASSERT().
        * include/pstl/parallel_backend_utils.h: Replace use of assert().

2019-04-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/90046
        * src/c++17/memory_resource.cc
        (monotonic_buffer_resource::_Chunk::allocate): Increase alignment if
        needed to allow placing a _Chunk at the end of the buffer.
        (monotonic_buffer_resource::_M_new_buffer): Remove static_assert.

2019-04-10  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/faq.xml: Add information about emergency EH pool.
        * doc/xml/manual/debug.xml: Update list of memory debugging tools.
        Move outdated information on mt_allocator to a separate section.
        * doc/xml/manual/evolution.xml: Clarify that GLIBCXX_FORCE_NEW
        doesn't affect the default allocator.

        * testsuite/lib/libstdc++.exp (check_v3_target_parallel_mode): Fix
        typo.

        PR libstdc++/89851
        * testsuite/20_util/variant/89851.cc: New test.

2019-04-09  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/variant: Adjust whitespace. Add comments.
        (_Multi_array): Leave primary template undefined.
        (_Multi_array<_Tp>): Define partial specialization for base case of
        recursion.
        (__gen_vtable_impl, __gen_vtable): Remove redundant && from type
        which is always a reference.
        (__gen_vtable::_S_apply()): Remove function, inline body into
        default member initializer.
        * testsuite/20_util/variant/visit.cc: Test with noncopyable types.

        * include/std/variant (__variant_idx_cookie): Add member type.
        (__visitor_result_type): Remove.
        (__do_visit): Use invoke_result instead of __visitor_result_type.
        * testsuite/20_util/variant/visit.cc: New test.

        PR libstdc++/90008
        * include/std/variant (_VARIANT_RELATION_FUNCTION_TEMPLATE): Remove
        unused capture.
        * testsuite/20_util/variant/90008.cc: New test.

2019-04-09  Thomas Rodgers  <trodgers@redhat.com>

        * include/pstl/algorithm_impl.h: Add namespace qualification.
        * include/pstl/execution_defs.h: Add namespace qualification.
        * include/pstl/execution_impl.h: Add namespace qualification.
        * include/pstl/numeric_impl.h: Add namespace qualification.
        * include/pstl/parallel_backend_tbb.h: Add namespace qualification.
        * include/pstl/unseq_backend_simd.h: Add namespace qualification.
        * include/pstl/parallel_backend_utils.h: Include <cassert>.

2019-04-08  Ville Voutilainen  <ville.voutilainen@gmail.com>

        Fix visit<R> for variant.
        * include/std/variant (__do_visit): Add a template parameter
        for enforcing same return types for visit.
        (__gen_vtable_impl): Likewise.
        (_S_apply_single_alt): Adjust.
        (__visit_invoke_impl): New. Handle casting to void.
        (__do_visit_invoke): New. Enforces same return types.
        (__do_visit_invoke_r): New. Converts return types.
        (__visit_invoke): Adjust.
        (__gen_vtable):  Add a template parameter for enforcing
        same return types for visit.
        * testsuite/20_util/variant/visit_r.cc: Add a test for a visitor with
        different return types.
        * testsuite/20_util/variant/visit_neg.cc: New. Ensures that
        visitors with different return types don't accidentally
        compile with regular visitation.

2019-04-08  Christophe Lyon  <christophe.lyon@linaro.org>

        * testsuite/27_io/filesystem/iterators/caching.cc: Add
        dg-require-filesystem-ts.

2019-04-05  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2020.xml: Update status.
        * include/std/variant (visit<R>): Define for C++2a (P0655R1).
        * testsuite/20_util/variant/visit_r.cc: New test.

        * include/bits/fs_dir.h (directory_iterator::operator*)
        (directory_iterator::operator->): Add noexcept.
        (operator==, operator!=): Replace namespace-scope equality operators
        for directory iterators with hidden friends.

        PR libstdc++/89986
        * config/abi/pre/gnu.ver: Add missing exports.
        * testsuite/27_io/filesystem/iterators/directory_iterator.cc: Test
        increment member.

        * config/abi/pre/gnu.ver: Export new symbols.
        * include/bits/fs_dir.h (recursive_directory_iterator::options())
        (recursive_directory_iterator::recursion_pending())
        (recursive_directory_iterator::disable_recursion_pending()): Remove
        inline definitions. Make noexcept.
        (recursive_directory_iterator::depth())
        (recursive_directory_iterator::operator*())
        (recursive_directory_iterator::operator->()): Make noexcept.
        (recursive_directory_iterator::_M_options)
        (recursive_directory_iterator::_M_pending): Remove data members.
        * src/c++17/fs_path.cc (_Dir_stack): Add constructor and data members.
        (recursive_directory_iterator::recursive_directory_iterator): Remove
        ctor-initializer. Use new constructor for _Dir_stack.
        (recursive_directory_iterator::options())
        (recursive_directory_iterator::recursion_pending())
        (recursive_directory_iterator::disable_recursion_pending()): Add
        non-inline definitions.
        (recursive_directory_iterator::depth()): Make noexcept.
        (recursive_directory_iterator::increment(error_code&))
        (recursive_directory_iterator::pop(error_code&)): Adjust to new
        location of options and recursion_pending members.
        * testsuite/27_io/filesystem/iterators/recursion_pending.cc: New test.
        * testsuite/util/testsuite_fs.h (__gnu_test::scoped_file): Add
        user-declared move constructor and assignment operator, to make the
        type move-only.

        * src/c++17/fs_dir.cc (_Dir::advance(bool, error_code&)): Handle
        d_type == DT_UNKNOWN immediately.
        (_Dir::should_recurse(bool, error_code&)): Remove file_type::unknown
        handling here.
        * testsuite/27_io/filesystem/iterators/caching.cc: New test.

        * include/bits/fs_path.h (path::operator=(path&&)): Check for self
        assignment.
        * src/c++17/fs_path.cc (path::operator=(const path&)): Likewise.
        * testsuite/27_io/filesystem/path/assign/copy.cc: Test self
        assignment.

        PR libstdc++/87431 (again)
        * include/bits/basic_string.h (__variant::_Never_valueless_alt):
        Define partial specialization for basic_string.
        * include/bits/shared_ptr.h (_Never_valueless_alt): Likewise for
        shared_ptr and weak_ptr.
        * include/bits/std_function.h (_Never_valueless_alt): Likewise for
        function.
        * include/bits/stl_vector.h (_Never_valueless_alt): Likewise for
        vector.
        * include/bits/unique_ptr.h (_Never_valueless_alt): Likewise for
        unique_ptr.
        * include/debug/vector (_Never_valueless_alt): Likewise for debug
        vector.
        * include/std/any (_Never_valueless_alt): Define explicit
        specialization for any.
        * include/std/variant (_Never_valueless_alt): Define primary template.
        (__never_valueless): Use _Never_valueless_alt instead of
        is_trivially_copyable.
        (variant::emplace<N>(Args&&...)): Add special case for non-throwing
        initializations to avoid try-catch overhead. Add special case for
        scalars produced by potentially-throwing conversions. Use
        _Never_valueless_alt instead of is_trivially_copyable for the
        remaining strong exception-safety cases.
        (variant::emplace<N>(initializer_list<U>, Args&&...)): Likewise.
        * testsuite/20_util/variant/87431.cc: Run both test functions.
        * testsuite/20_util/variant/exception_safety.cc: New test.
        * testsuite/20_util/variant/run.cc: Use pmr::string instead of string,
        so the variant becomes valueless.

2019-04-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/85184
        * include/std/variant (_Copy_assign_base, _Move_assign_base, variant):
        Remove assertions.
        (variant::emplace<_Tp>): Return result of emplace<N> directly.

        * include/std/string (__hash_string_base): New class template defining
        operator() for hashing strings.
        (hash<pmr::string>, hash<pmr::u8string>, hash<pmr::u16string>)
        (hash<pmr::u32string>, hash<pmr::wstring>): Define for C++17.
        * testsuite/21_strings/basic_string/hash/hash.cc: New test.
        * testsuite/21_strings/basic_string/hash/hash_char8_t.cc: New test.

2019-04-01  Ville Voutilainen  <ville.voutilainen@gmail.com>

        Use single-visitation in variant assignment and swap and relops.
        Also use indices instead of types when checking whether
        variants hold the same thing.
        * include/std/variant (__do_visit): Add a template parameter
        for index visitation, invoke with indices if index visitation
        is used.
        (__variant_idx_cookie): New.
        (__visit_with_index): Likewise.
        (_Copy_assign_base::operator=): Do single-visitation with
        an index visitor.
        (_Move_assign_base::operator=): Likewise.
        (_Extra_visit_slot_needed): Adjust.
        (__visit_invoke): Call with indices if it's an index visitor.
        (relops): Do single-visitation with an index visitor.
        (swap): Likewise.
        (__visitor_result_type): New.

2019-03-30  Eric Botcazou  <ebotcazou@adacore.com>

        * src/c++17/fs_ops.cc (fs::permissions): Use std::errc::not_supported.

2019-03-28  Ville Voutilainen  <ville.voutilainen@gmail.com>

        Don't revisit a variant we are already visiting.
        * include/std/variant (__variant_construct_single): New.
        (__variant_construct): Use it.
        (_M_destructive_move): Likewise.
        (_M_destructive_copy): Likewise.
        (_Copy_assign_base::operator=): Adjust.
        (_Move_assign_base::operator=): Likewise.
        (swap): Likewise.

2019-03-26  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/85965
        * include/bits/hashtable.h (_Hashtable): Move static assertions to
        destructor so they are not evaluated until the _Key type is complete.
        * include/bits/stl_tree.h (_Rb_tree): Likewise.
        * testsuite/23_containers/set/85965.cc: New test.
        * testsuite/23_containers/unordered_set/85965.cc: New test.
        * testsuite/23_containers/map/48101_neg.cc: Replace "here" errors
        with regexp matching the corresponding _Rb_tree specialization.
        * testsuite/23_containers/multimap/48101_neg.cc: Likewise.
        * testsuite/23_containers/multiset/48101_neg.cc: Remove "here" error.
        * testsuite/23_containers/set/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_map/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_multimap/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_multiset/48101_neg.cc: Likewise.
        * testsuite/23_containers/unordered_set/48101_neg.cc: Likewise.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

        PR libstdc++/89825
        Fix based on a suggestion by Antony Polukhin.
        * include/std/variant (__never_valueless): New.
        (_M_valid): Use it.
        (_Extra_visit_slot_needed): New.
        (_Multi_array): Use it.
        (_S_apply_all_alts): Likewise.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

        PR libstdc++/89824
        Fix based on a suggestion by Antony Polukhin.
        * include/std/variant (__gen_vtable): Don't reserve an
        additional table slot, _Multi_array already does that.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

        PR libstdc++/89816
        Fix based on a suggestion by Antony Polukhin.
        * include/std/variant (__variant_construct): Capture a pointer
        to the storage and visit just one variant.

2019-03-22  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/backwards_compatibility.xml: Remove link to
        Doxygen-generated pages with unstable URL.
        * doc/xml/manual/concurrency_extensions.xml: Likewise.
        * doc/xml/manual/extensions.xml: Likewise.
        * doc/xml/manual/parallel_mode.xml: Likewise.
        * doc/xml/manual/support.xml: Likewise.

        * include/bits/stl_algobase.h (__lg): Do arithmetic on type int to
        avoid -Wconversion warnings.

2019-03-21  Thomas Rodgers  <trodgers@redhat.com>
        
        * include/Makefile.am (std_header): Add ${std_srcdir}/execution.
        (pstl_srcdir, pstl_builddir, pstl_headers): New variables.
        (allstamped): Add stamp-pstl.
        (install-headers): Add ptsl_builddir.
        * include/Makefile.in: Regenerate.
        * include/bits/c++config: Add pstl configuration.
        * include/pstl/LICENSE.txt: New file.
        * include/pstl/algorithm_fwd.h: New file.
        * include/pstl/algorithm_impl.h: New file.
        * include/pstl/execution_defs.h: New file.
        * include/pstl/execution_impl.h: New file.
        * include/pstl/glue_algorithm_defs.h: New file.
        * include/pstl/glue_algorithm_impl.h: New file.
        * include/pstl/glue_execution_defs.h: New file.
        * include/pstl/glue_memory_defs.h: New file.
        * include/pstl/glue_memory_impl.h: New file.
        * include/pstl/glue_numeric_defs.h: New file.
        * include/pstl/glue_numeric_impl.h: New file.
        * include/pstl/memory_impl.h: New file.
        * include/pstl/numeric_fwd.h: New file.
        * include/pstl/numeric_impl.h: New file.
        * include/pstl/parallel_backend.h: New file.
        * include/pstl/parallel_backend_tbb.h: New file.
        * include/pstl/parallel_backend_utils.h: New file.
        * include/pstl/parallel_impl.h: New file.
        * include/pstl/pstl_config.h: New file.
        * include/pstl/unseq_backend_simd.h: New file.
        * include/pstl/utils.h: New file.
        * include/std/algorithm: Include parallel algorithm implementations.
        * include/std/execution: New file.
        * include/std/memory: Include parallel algorithm implementations.
        * include/std/numeric: Include parallel algorithm implementations.
        * include/std/version: Add parallel algorithms feature test macro.
        * testsuite/util/pstl/pstl_test_config.h: New file.
        * testsuite/util/pstl/test_utils.h: New file.
        * testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc: New file.
        * testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc: New file.
        * testsuite/20_util/specialized_algorithms/pstl/uninitialized_fill_destroy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc: New file.
        * testsuite/25_algorithms/pstl/alg_merge/merge.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/fill.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/generate.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/remove_copy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/replace.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/swap_ranges.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/transform_binary.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/transform_unary.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc: New file.
        * testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/adjacent_find.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/for_each.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/mismatch.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/includes.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/is_sorted.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/minmax_element.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/set.cc: New file.
        * testsuite/25_algorithms/pstl/alg_sorting/sort.cc: New file.
        * testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc: New file.
        * testsuite/26_numerics/pstl/numeric_ops/reduce.cc: New file.
        * testsuite/26_numerics/pstl/numeric_ops/scan.cc: New file.
        * testsuite/26_numerics/pstl/numeric_ops/transform_reduce.cc: New file.
        * testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc: New file.
        * testsuite/testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc: New file.
        * testsuite/testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc: New file.
        * testsuite/testsuite/20_util/specialized_algorithms/pstl/uninitialized_fill_destroy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_merge/merge.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/fill.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/generate.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/remove_copy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/replace.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/swap_ranges.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/transform_binary.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/transform_unary.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/adjacent_find.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/for_each.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/mismatch.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/includes.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/is_sorted.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/minmax_element.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/set.cc: New file.
        * testsuite/testsuite/25_algorithms/pstl/alg_sorting/sort.cc: New file.
        * testsuite/testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc: New file.
        * testsuite/testsuite/26_numerics/pstl/numeric_ops/reduce.cc: New file.
        * testsuite/testsuite/26_numerics/pstl/numeric_ops/scan.cc: New file.
        * testsuite/testsuite/26_numerics/pstl/numeric_ops/transform_reduce.cc: New file.
        * testsuite/testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc: New file.

2019-03-21  Jonathan Wakely  <jwakely@redhat.com>

        * include/c_compatibility/math.h [!__STDCPP_WANT_MATH_SPEC_FUNCS__]
        (assoc_laguerre, assoc_laguerref, assoc_laguerrel, assoc_legendre)
        (assoc_legendref, assoc_legendrel, beta, betaf, betal, comp_ellint_1)
        (comp_ellint_1f, comp_ellint_1l, comp_ellint_2, comp_ellint_2f)
        (comp_ellint_2l, comp_ellint_3, comp_ellint_3f, comp_ellint_3l)
        (cyl_bessel_i, cyl_bessel_if, cyl_bessel_il, cyl_bessel_j)
        (cyl_bessel_jf, cyl_bessel_jl, cyl_bessel_k, cyl_bessel_kf)
        (cyl_bessel_kl, cyl_neumann, cyl_neumannf, cyl_neumannl, ellint_1)
        (ellint_1f, ellint_1l, ellint_2, ellint_2f, ellint_2l, ellint_3)
        (ellint_3f, ellint_3l, expint, expintf, expintl, hermite, hermitef)
        (hermitel, laguerre, laguerref, laguerrel, legendre, legendref)
        (legendrel, riemann_zeta, riemann_zetaf, riemann_zetal, sph_bessel)
        (sph_besself, sph_bessell, sph_legendre, sph_legendref, sph_legendrel)
        (sph_neumann, sph_neumannf, sph_neumannl): Only add using-declarations
        when the special functions IS is enabled, not for C++17.
        * testsuite/26_numerics/headers/cmath/functions_global_c++17.cc:
        Replace with ...
        * testsuite/26_numerics/headers/cmath/functions_global.cc: New test,
        without checks for special functions in C++17.
        * testsuite/26_numerics/headers/cmath/special_functions_global.cc:
        New test.

        PR libstdc++/88066
        * include/backward/hash_map: Use <> for includes not "".
        * include/backward/hash_set: Likewise.
        * include/backward/strstream: Likewise.
        * include/tr1/bessel_function.tcc: Likewise.
        * include/tr1/exp_integral.tcc: Likewise.
        * include/tr1/legendre_function.tcc: Likewise.
        * include/tr1/modified_bessel_func.tcc: Likewise.
        * include/tr1/riemann_zeta.tcc: Likewise.

2019-03-19  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/allocator.xml: Link to table documenting evolution
        of extension allocators.
        * doc/xml/manual/evolution.xml: Use angle brackets for header names.
        Document new headers in 7.2, 8.1 and 9.1 releases.
        * doc/xml/manual/using.xml: Adjust link target for new_allocator.
        * doc/html/*: Regenerate.

2019-03-12  John David Anglin  <dave.anglin@bell.net>

        PR libstdc++/89461
        * testsuite/lib/libstdc++.exp: Locate libatomic.
        * testsuite/lib/dg-options.exp (add_options_for_libatomic): New.
        * testsuite/20_util/shared_ptr/thread/default_weaktoshared.cc: Add
        libatomic options.
        * testsuite/20_util/shared_ptr/thread/mutex_weaktoshared.cc: Likewise.
        * testsuite/experimental/net/timer/waitable/cons.cc: Likewise.
        * testsuite/experimental/net/timer/waitable/dest.cc: Likewise.
        * testsuite/experimental/net/timer/waitable/ops.cc: Likewise.

2019-03-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89460
        * configure.ac: Check for sockatmark.
        * crossconfig.m4: Check for sockatmark.
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * include/experimental/internet (address_v4::_S_hton): Rename
        overloaded functions to _S_hton_16 and _S_ntoh_16.
        (address_v4::_S_ntoh): Rename to _S_ntoh_16 and _S_ntoh_32.
        (basic_endpoint): Adjust calls to _S_hton and _S_ntoh.
        * include/experimental/socket (basic_socket::at_mark): Check
        _GLIBCXX_HAVE_SOCKATMARK.

        * testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc: Use
        const variables instead of macros.

        PR libstdc++/89629
        * libsupc++/hash_bytes.cc [__SIZEOF_SIZE_T__ == 8] (_Hash_bytes):
        Use correct type for len_aligned.
        * testsuite/20_util/hash/89629.cc: New test.

2019-03-11  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/89641
        * include/std/atomic (atomic<T>::store, atomic<T>::load,
        atomic<T>::exchange, atomic<T>::compare_exchange_weak,
        atomic<T>::compare_exchange_strong): Cast __m or __s and __f to int.
        * include/bits/atomic_base.h (__atomic_base<T>::operator++,
        __atomic_base<T>::operator--, __atomic_base<T>::operator+=,
        __atomic_base<T>::operator-=, __atomic_base<T>::operator&=,
        __atomic_base<T>::operator|=, __atomic_base<T>::operator^=,
        __atomic_base<T*>::operator++, __atomic_base<T*>::operator--,
        __atomic_base<T*>::operator+=, __atomic_base<T*>::operator-=): Cast
        memory_order_seq_cst to int.

2019-03-08  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/using.xml: Use link element instead of xref.
        * doc/html/*: Regenerate.

        * include/bits/fs_path.h (path::format): Add fixed underlying type.

2019-03-08  François Dumont  <fdumont@gcc.gnu.org>

        PR libstdc++/89477
        * include/debug/map.h (map): Use _RequireNotAllocator to constrain
        parameters in deduction guides.
        * include/debug/multimap.h (multimap): Likewise.
        * include/debug/set.h (multimap): Likewise.
        * include/debug/multiset.h (multimap): Likewise.
        * include/debug/unordered_map (unordered_map): Likewise.
        (unordered_multimap): Likewise.
        * include/debug/unordered_set (unordered_set): Likewise.
        (unordered_multiset): Likewise.

        PR libstdc++/89608
        * include/debug/unordered_map (unordered_map<>::_M_check_rehashed):
        Invalidate all iterators in case of rehash.
        (unordered_multimap<>::_M_check_rehashed): Likewise.
        * include/debug/unordered_set
        (unordered_set<>::_M_check_rehashed): Likewise.
        (unordered_multiset<>::_M_check_rehashed): Likewise.
        * testsuite/23_containers/unordered_set/debug/89608_neg.cc: New.

2019-03-07  Andreas Schwab  <schwab@suse.de>

        * config/abi/post/riscv64-linux-gnu: New directory.
        * config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: New file.

2019-03-07  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/function_objects/bind_front/1.cc: Change from
        compile test to run. Fix typo.

        * doc/xml/manual/status_cxx2020.xml: Update C++20 status.
        * doc/html/*: Regenerate.

        P0356R5 Simplified partial function application
        * include/std/functional [C++20] (_Bind_front, _Bind_front_t): Define
        helpers for bind_front.
        (bind_front, __cpp_lib_bind_front): Define.
        * testsuite/20_util/function_objects/bind_front/1.cc: New test.

2019-03-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/type_traits (__cpp_lib_bounded_array_traits): Define.
        * include/std/version (__cpp_lib_bounded_array_traits): Likewise.
        * testsuite/20_util/is_bounded_array/value.cc: Check for macro.
        * testsuite/20_util/is_unbounded_array/value.cc: Likewise.

2019-03-06  Edward Smith-Rowland  <3dw4rd@verizon.net>

        PR libstdc++/86655 - std::assoc_legendre should not constrain
        the value of m (or x).
        * include/tr1/legendre_function.tcc (__assoc_legendre_p,
        __sph_legendre): If degree > order Don't throw, return 0.
        (__legendre_p, __assoc_legendre_p): Don't constrain x either.
        * testsuite/special_functions/02_assoc_legendre/pr86655.cc: New test.
        * testsuite/special_functions/20_sph_legendre/pr86655.cc: New test.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        02_assoc_legendre/pr86655.cc: New test.
        * testsuite/tr1/5_numerical_facilities/special_functions/
        22_sph_legendre/pr86655.cc: New test.

2019-03-06  Ville Voutilainen  <ville.voutilainen@gmail.com>

        Rewrite variant.
        Also PR libstdc++/85517
        * include/std/variant (__do_visit): New.
        (__variant_cast): Likewise.
        (__variant_cookie): Likewise.
        (__erased_*): Remove.
        (_Variant_storage::_S_vtable): Likewise.
        (_Variant_storage::__M_reset_impl): Adjust to use __do_visit.
        (_Variant_storage::__M_reset): Adjust.
        (__variant_construct): New.
        (_Copy_ctor_base(const _Copy_ctor_base&)): Adjust to use
        __variant_construct.
        (_Move_ctor_base(_Move_ctor_base&&)): Likewise.
        (_Move_ctor_base::__M_destructive_copy): New.
        (_Move_ctor_base::__M_destructive_move): Adjust to use
        __variant_construct.
        (_Copy_assign_base::operator=): Adjust to use __do_visit.
        (_Copy_assign_alias): Adjust to check both copy assignment
        and copy construction for triviality.
        (_Move_assign_base::operator=): Adjust to use __do_visit.
        (_Multi_array): Add support for visitors that accept and return
        a __variant_cookie.
        (__gen_vtable_impl::_S_apply_all_alts): Likewise.
        (__gen_vtable_impl::_S_apply_single_alt): Likewise.
        (__gen_vtable_impl::__element_by_index_or_cookie): New. Generate
        a __variant_cookie temporary for a variant that is valueless and..
        (__gen_vtable_impl::__visit_invoke): ..adjust here.
        (__gen_vtable::_Array_type): Conditionally make space for
        the __variant_cookie visitor case.
        (__variant_construct_by_index): New.
        (get_if): Adjust to use std::addressof.
        (relops): Adjust to use __do_visit.
        (variant): Add __variant_cast and __variant_construct_by_index
        as friends.
        (variant::emplace): Use _M_reset() and __variant_construct_by_index
        instead of self-destruction.
        (variant::swap): Adjust to use __do_visit.
        (visit): Reimplement in terms of __do_visit.
        (__variant_hash_call_base_impl::operator()): Adjust to use __do_visit.
        * testsuite/20_util/variant/compile.cc: Adjust.
        * testsuite/20_util/variant/run.cc: Likewise.

2019-03-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/c++config.h (_cpp_lib_char8_t): Add L suffix to
        constant.
        * testsuite/experimental/feat-char8_t.cc: Likewise.

         * include/std/type_traits [C++20] (is_bounded_array)
         (is_unbounded_array, is_bounded_array_v, is_unbounded_array_v):
         Define.
         * testsuite/20_util/is_bounded_array/requirements/
         explicit_instantiation.cc: New test.
         * testsuite/20_util/is_bounded_array/requirements/typedefs.cc: New
         test.
         * testsuite/20_util/is_bounded_array/value.cc: New test.
         * testsuite/20_util/is_unbounded_array/requirements/
         explicit_instantiation.cc: New test.
         * testsuite/20_util/is_unbounded_array/requirements/typedefs.cc: New
         * test.
         * testsuite/20_util/is_unbounded_array/value.cc: New test.

        * include/bits/ptr_traits.h [C++20] (pointer_traits<T*>::pointer_to):
        Add constexpr.
        * testsuite/20_util/pointer_traits/pointer_to_constexpr.cc: New test.

2019-03-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/c_compatibility/math.h [C++20] (lerp): Add using
        declaration.
        * include/c_global/cmath [C++20] (__cpp_lib_interpolate): Define.
        (__lerp): Define function template to implement lerp.
        (lerp(float, float, float), lerp(double, double, double))
        (lerp(long double, long double, long double)): Define for C++20.
        * include/std/numeric [C++20] (__cpp_lib_interpolate): Define.
        (midpoint(T, T), midpoint(T*, T*)): Define.
        * include/std::version [C++20] (__cpp_lib_interpolate): Define.
        * testsuite/26_numerics/lerp.cc: New test.
        * testsuite/26_numerics/midpoint/floating.cc: New test.
        * testsuite/26_numerics/midpoint/integral.cc: New test.
        * testsuite/26_numerics/midpoint/pointer.cc: New test.

2019-03-04  Edward Smith-Rowland  <3dw4rd@verizon.net>

        PR libstdc++/88996 Implement P0439R0
        Make std::memory_order a scoped enumeration.
        * include/bits/atomic_base.h: For C++20 make memory_order a scoped enum,
        add variables for the old enumerators.  Adjust calls.
        * testsuite/29_atomics/headers/atomic/types_std_c++2a.cc: New test.
        * testsuite/29_atomics/headers/atomic/types_std_c++2a_neg.cc: New test.

2019-03-04  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/26_numerics/bit/bitops.rot/rotl.cc: Remove bogus dg-do
        directive.

        * include/std/memory_resource (polymorphic_allocator): Add default
        template argument for C++20.
        (polymorphic_allocator::allocate_bytes)
        (polymorphic_allocator::deallocate_bytes)
        (polymorphic_allocator::allocate_object)
        (polymorphic_allocator::deallocate_object)
        (polymorphic_allocator::new_object)
        (polymorphic_allocator::delete_object): New member functions for
        C++20.
        * testsuite/20_util/polymorphic_allocator/allocate_object.cc: New
        test.

2019-03-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89562
        * src/filesystem/ops-common.h (do_copy_file): Open files in binary
        mode for mingw.

2019-03-01  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_allocator.h (__gnu_test::memory_resource)
        [!__cpp_sized_deallocation]: Do not pass size to operator delete.

        * include/std/memory (uses_allocator_construction_args): New set of
        overloaded functions.
        (make_obj_using_allocator, uninitialized_construct_using_allocator):
        New functions.
        * include/std/memory_resource (polymorphic_allocator::construct)
        [__cplusplus > 201703l]: Replace all overloads with a single function
        using uses_allocator_construction_args.
        * testsuite/20_util/polymorphic_allocator/construct_c++2a.cc: New
        test.
        * testsuite/20_util/uses_allocator/make_obj.cc: New test.

2019-02-27  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89466
        * acinclude.m4 (GLIBCXX_CONFIGURE_DOCBOOK): Reorder check for local
        stylesheet directories before check for xsltproc. Try to use
        xmlcatalog to find local stylesheet directory before trying hardcoded
        paths. Add path used by suse to hardcoded paths. Adjust xsltproc
        check to look for the same stylesheet as doc/Makefile.am uses. Don't
        use xsltproc if xmlcatalog fails to find a local stylesheet.
        * configure.ac: Check for xmlcatalog.
        * Makefile.in: Regenerate.
        * configure: Likewise.
        * doc/Makefile.in: Likewise.
        * include/Makefile.in: Likewise.
        * libsupc++/Makefile.in: Likewise.
        * po/Makefile.in: Likewise.
        * python/Makefile.in: Likewise.
        * src/Makefile.in: Likewise.
        * src/c++11/Makefile.in: Likewise.
        * src/c++17/Makefile.in: Likewise.
        * src/c++98/Makefile.in: Likewise.
        * src/filesystem/Makefile.in: Likewise.
        * testsuite/Makefile.in: Likewise.

2019-02-26  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89477
        * include/bits/alloc_traits.h (_RequireNotAllocator): New helper for
        container deduction guides.
        * include/bits/hashtable.h (_RequireNotAllocatorOrIntegral): Likewise.
        * include/bits/stl_map.h (map): Use _RequireNotAllocator to constrain
        parameters in deduction guides.
        * include/bits/stl_multimap.h (multimap): Likewise.
        * include/bits/stl_multiset.h (multiset): Likewise.
        * include/bits/stl_queue.h (queue, priority_queue): Likewise.
        * include/bits/stl_set.h (set): Likewise.
        * include/bits/stl_stack.h (stack): Likewise.
        * include/bits/unordered_map.h (unordered_map, unordered_multimap):
        use _RequireNotAllocator and _RequireNotAllocatorOrIntegral to
        constrain parameters in deduction guides.
        * include/bits/unordered_set.h (unordered_set, unordered_multiset):
        Likewise.
        * testsuite/23_containers/map/cons/deduction.cc: Test additional
        deduction cases.
        * testsuite/23_containers/multiset/cons/deduction.cc: Likewise.
        * testsuite/23_containers/set/cons/deduction.cc: Likewise.
        * testsuite/23_containers/unordered_map/cons/deduction.cc: Likewise.
        * testsuite/23_containers/unordered_multimap/cons/deduction.cc:
        Likewise.
        * testsuite/23_containers/unordered_multiset/cons/deduction.cc:
        Likewise.
        * testsuite/23_containers/unordered_set/cons/deduction.cc: Likewise.

        PR libstdc++/89416
        * include/bits/alloc_traits.h (__is_alloc_insertable_impl): Change
        to class template and partial specialization using void_t.
        (__is_copy_insertable, __is_move_insertable): Adjust base class.

2019-02-24  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89416
        * include/bits/alloc_traits.h (__is_alloc_insertable_impl): Make
        copy and move members public.

2019-02-23  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/type_traits (__underlying_type_impl): New helper to
        make underlying_type SFINAE-friendly.
        (underlying_type): Derive from __underlying_type_impl.
        * testsuite/20_util/underlying_type/requirements/typedefs-3.cc: New
        test.

        PR libstdc++/89446
        * include/bits/char_traits.h (__constant_char_array): Check index is
        in range before dereferencing.
        (char_traits<char>::compare, char_traits<char>::find)
        (char_traits<char8_t>::compare, char_traits<char8_t>::find): Return
        immediately if n is zero.
        (char_traits<wchar_t>::compare, char_traits<wchar_t>::find): Likewise.
        Remove workarounds for PR 67026.
        * testsuite/21_strings/basic_string_view/operators/char/89446.cc:
        New test.
        * testsuite/21_strings/basic_string_view/operators/wchar_t/89446.cc:
        New test.

2019-02-22  Eric Botcazou  <ebotcazou@adacore.com>

        * config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: Adjust.
        * config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: Likewise.

2019-02-22  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/89402
        * src/c++98/compatibility-ldbl.cc (_ZNKSt4hashIeEclEe): Change return
        type to std::size_t and argument to type to long double.

2019-02-22  Eric Botcazou  <ebotcazou@adacore.com>

        * configure.host (abi_baseline_pair): Adjust for SPARC64/Linux.
        * config/abi/post/sparc64-linux-gnu: New directory.
        * config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: New file.
        * config/abi/post/sparc64-linux-gnu/32: New directory.
        * config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: New file.

2019-02-21  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/29_atomics/headers/atomic/types_std_c++20.cc: New test.
        * testsuite/29_atomics/headers/atomic/types_std_c++20_neg.cc: New
        test.

2019-02-22  Tom Honermann  <tom@honermann.net>

        * python/libstdcxx/v6/printers.py (register_type_printers): Add type
        printers for u8string and u8string_view.

2019-02-22  Tom Honermann  <tom@honermann.net>

        * testsuite/18_support/byte/ops.cc: Validate
        std::to_integer<char8_t>, std::to_integer<char16_t>, and
        std::to_integer<char32_t>.
        * testsuite/18_support/numeric_limits/dr559.cc: Validate
        std::numeric_limits<char8_t>.
        * testsuite/18_support/numeric_limits/lowest.cc: Validate
        std::numeric_limits<char8_t>::lowest().
        * testsuite/18_support/numeric_limits/max_digits10.cc: Validate
        std::numeric_limits<char8_t>::max_digits10.
        * testsuite/18_support/type_info/fundamental.cc: Validate
        typeinfo for char8_t.
        * testsuite/20_util/from_chars/1_c++20_neg.cc: New test, validating
        std::from_chars with char8_t.
        * testsuite/20_util/hash/requirements/explicit_instantiation.cc:
        Validate explicit instantiation of std::hash<char8_t>.
        * testsuite/20_util/is_integral/value.cc: Validate
        std::is_integral<char8_t>.
        * testsuite/20_util/make_signed/requirements/typedefs-4.cc:
        Validate std::make_signed<char8_t>.
        * testsuite/21_strings/basic_string/cons/char/deduction.cc:
        Validate u8string construction from char8_t sources.
        * testsuite/21_strings/basic_string/types/pmr_typedefs.cc: Validate
        std::pmr::u8string.
        * testsuite/21_strings/basic_string_view/operations/compare/
        char/70483.cc: Validate substr operations on u8string_view.
        * testsuite/21_strings/basic_string_view/typedefs.cc: Validate that
        the u8string_view typedef is defined.
        * testsuite/21_strings/char_traits/requirements/
        constexpr_functions.cc: Validate char_traits<char8_t> constexpr
        member functions.
        * testsuite/21_strings/char_traits/requirements/
        constexpr_functions_c++17.cc: Validate char_traits<char8_t> C++17
        constexpr member functions.
        * testsuite/21_strings/headers/string/types_std_c++0x.cc: Validate
        that the u8string typedef is defined.
        * testsuite/22_locale/locale/cons/unicode.cc: Validate the presence
        of the std::codecvt<char16_t, char8_t, std::mbstate_t> and
        std::codecvt<char32_t, char8_t, std::mbstate_t> facets.
        * testsuite/29_atomics/atomic/cons/assign_neg.cc: Update line
        numbers.
        * testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
        * testsuite/29_atomics/atomic_integral/cons/assign_neg.cc:
        Likewise.
        * testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
        * testsuite/29_atomics/atomic_integral/is_always_lock_free.cc:
        Validate std::atomic<char8_t>::is_always_lock_free
        * testsuite/29_atomics/atomic_integral/operators/bitwise_neg.cc:
        Update line numbers.
        * testsuite/29_atomics/atomic_integral/operators/decrement_neg.cc:
        Likewise.
        * testsuite/29_atomics/atomic_integral/operators/increment_neg.cc:
        Likewise.
        * testsuite/experimental/polymorphic_allocator/pmr_typedefs_string.cc:
        Validate std::experimental::pmr::u8string.
        * testsuite/experimental/string_view/typedefs.cc: Validate that the
        u8string_view typedef is defined.
        * testsuite/util/testsuite_common_types.h: Add char8_t, char16_t and
        char32_t to the typelists.

2019-02-22  Tom Honermann  <tom@honermann.net>

        * include/ext/typelist.h: Constrain a partial specialization of
        typelist::detail::append_ to only match chain<T1,T2>.

2019-02-21  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89416
        * include/bits/alloc_traits.h (__is_alloc_insertable_impl): Replace
        class template with class. Replace move and copy member types with
        member alias templates, so they are only instantiated when needed.
        (__is_copy_insertable, __is_move_insertable): Adjust base class.
        * testsuite/23_containers/vector/modifiers/push_back/89130.cc: Enable
        test for C++11/14/17 as well.
        * testsuite/23_containers/vector/modifiers/push_back/89416.cc: New
        test.

2019-02-20  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/89402
        * src/c++98/compatibility-ldbl.cc (_ZNKSt4hashIeEclEe): Add
        _GLIBCXX_PURE to the alias declaration.

2019-02-19  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/21_strings/basic_string/literals/types.cc
        [_GLIBCXX_USE_CHAR8_T]: Adjust expected string type for u8 literal.
        * testsuite/21_strings/basic_string/literals/values.cc
        [_GLIBCXX_USE_CHAR8_T]: Likewise.
        * testsuite/22_locale/codecvt/char16_t.cc: Adjust for u8 literals
        potentially having different type.
        * testsuite/22_locale/codecvt/char32_t.cc: Likewise.
        * testsuite/22_locale/codecvt/codecvt_utf8/79980.cc: Cast u8 literal
        to char.
        * testsuite/22_locale/codecvt/codecvt_utf8/wchar_t/1.cc: Likewise.
        * testsuite/22_locale/codecvt/utf8.cc: Likewise.
        * testsuite/22_locale/conversions/string/2.cc: Remove u8 prefix from
        string literals only using basic character set.
        * testsuite/22_locale/conversions/string/3.cc: Likewise. Cast other
        u8 literals to char.
        * testsuite/29_atomics/headers/atomic/macros.cc [_GLIBCXX_USE_CHAR8_T]:
        Test ATOMIC_CHAR8_T_LOCK_FREE.
        Add missing #error to ATOMIC_CHAR16_T_LOCK_FREE test.
        * testsuite/29_atomics/headers/atomic/types_std_c++0x.cc
        [_GLIBCXX_USE_CHAR8_T]: Check for std::atomic_char8_t.
        * testsuite/experimental/string_view/literals/types.cc
        [_GLIBCXX_USE_CHAR8_T]: Adjust expected string_view type for u8
        literal.
        * testsuite/experimental/string_view/literals/values.cc
        [_GLIBCXX_USE_CHAR8_T]: Likewise.

2019-02-19  Tom Honermann  <tom@honermann.net>

        * testsuite/18_support/numeric_limits/char8_t.cc: New test cloned
        from char16_32_t.cc; validates numeric_limits<char8_t>.
        * testsuite/21_strings/basic_string/literals/types-char8_t.cc: New
        test cloned from types.cc; validates operator""s for char8_t
        returns u8string.
        * testsuite/21_strings/basic_string/literals/values-char8_t.cc: New
        test cloned from values.cc; validates construction and comparison
        of u8string values.
        * testsuite/21_strings/basic_string/requirements/
        /explicit_instantiation/char8_t/1.cc: New test cloned from
        char16_t/1.cc; validates explicit instantiation of
        basic_string<char8_t>.
        * testsuite/21_strings/basic_string_view/literals/types-char8_t.cc:
        New test cloned from types.cc; validates operator""sv for char8_t
        returns u8string_view.
        * testsuite/21_strings/basic_string_view/literals/
        values-char8_t.cc: New test cloned from values.cc; validates
        construction and comparison of u8string_view values.
        * testsuite/21_strings/basic_string_view/requirements/
        explicit_instantiation/char8_t/1.cc: New test cloned from
        char16_t/1.cc; validates explicit instantiation of
        basic_string_view<char8_t>.
        * testsuite/21_strings/char_traits/requirements/char8_t/65049.cc:
        New test cloned from char16_t/65049.cc; validates that
        char_traits<char8_t> is not vulnerable to the concerns in PR65049.
        * testsuite/21_strings/char_traits/requirements/char8_t/
        typedefs.cc: New test cloned from char16_t/typedefs.cc; validates
        that char_traits<char8_t> member typedefs are present and correct.
        * testsuite/21_strings/char_traits/requirements/
        explicit_instantiation/char8_t/1.cc: New test cloned from
        char16_t/1.cc; validates explicit instantiation of
        char_traits<char8_t>.
        * testsuite/22_locale/codecvt/char16_t-char8_t.cc: New test cloned
        from char16_t.cc: validates
        codecvt<char16_t, char8_t, mbstate_t>.
        * testsuite/22_locale/codecvt/char32_t-char8_t.cc: New test cloned
        from char32_t.cc: validates
        codecvt<char32_t, char8_t, mbstate_t>.
        * testsuite/22_locale/codecvt/utf8-char8_t.cc: New test cloned from
        utf8.cc; validates codecvt<char16_t, char8_t, std::mbstate_t> and
        codecvt<char32_t, char8_t, std::mbstate_t>.
        * testsuite/27_io/filesystem/path/native/string-char8_t.cc: New
        test cloned from string.cc; validates filesystem::path construction
        from char8_t input.
        * testsuite/experimental/feat-char8_t.cc: New test; validates that
        the __cpp_lib_char8_t feature test macro is defined with the
        correct value.
        * testsuite/experimental/filesystem/path/native/string-char8_t.cc:
        New test cloned from string.cc; validates filesystem::path
        construction from char8_t input.
        * testsuite/experimental/string_view/literals/types-char8_t.cc: New
        test cloned from types.cc; validates operator""sv for char8_t
        returns u8string_view.
        * testsuite/experimental/string_view/literals/values-char8_t.cc:
        New test cloned from values.cc; validates construction and
        comparison of u8string_view values.
        * testsuite/experimental/string_view/requirements/
        explicit_instantiation/char8_t/1.cc: New test cloned from
        char16_t/1.cc; validates explicit instantiation of
        basic_string_view<char8_t>.
        * testsuite/ext/char8_t/atomic-1.cc: New test; validates that
        ATOMIC_CHAR8_T_LOCK_FREE is not defined if char8_t support is not
        enabled.

2019-02-19  Tom Honermann  <tom@honermann.net>

        P0482R5 char8_t: Standard library support
        * config/abi/pre/gnu-versioned-namespace.ver (CXXABI_2.0): Add
        typeinfo symbols for char8_t.
        * config/abi/pre/gnu.ver: Add CXXABI_1.3.12.
        (GLIBCXX_3.4.26): Add symbols for specializations of
        numeric_limits and codecvt that involve char8_t.
        (CXXABI_1.3.12): Add typeinfo symbols for char8_t.
        * include/bits/atomic_base.h: Add atomic_char8_t.
        * include/bits/basic_string.h: Add std::hash<u8string> and
        operator""s(const char8_t*, size_t).
        * include/bits/c++config: Define _GLIBCXX_USE_CHAR8_T and
        __cpp_lib_char8_t.
        * include/bits/char_traits.h: Add char_traits<char8_t>.
        * include/bits/codecvt.h: Add
        codecvt<char16_t, char8_t, mbstate_t>,
        codecvt<char32_t, char8_t, mbstate_t>,
        codecvt_byname<char16_t, char8_t, mbstate_t>, and
        codecvt_byname<char32_t, char8_t, mbstate_t>.
        * include/bits/cpp_type_traits.h: Add __is_integer<char8_t> to
        recognize char8_t as an integral type.
        * include/bits/fs_path.h: (path::__is_encoded_char): Recognize
        char8_t.
        (path::u8string): Return std::u8string when char8_t support is
        enabled.
        (path::generic_u8string): Likewise.
        (path::_S_convert): Handle conversion from char8_t input.
        (path::_S_str_convert): Likewise.
        * include/bits/functional_hash.h: Add hash<char8_t>.
        * include/bits/locale_conv.h (__str_codecvt_out): Add overloads for
        char8_t.
        * include/bits/locale_facets.h (_GLIBCXX_NUM_UNICODE_FACETS): Bump
        for new char8_t specializations.
        * include/bits/localefwd.h: Add missing declarations of
        codecvt<char16_t, char, mbstate_t> and
        codecvt<char32_t, char, mbstate_t>.  Add char8_t declarations
        codecvt<char16_t, char8_t, mbstate_t> and
        codecvt<char32_t, char8_t, mbstate_t>.
        * include/bits/postypes.h: Add u8streampos
        * include/bits/stringfwd.h: Add declarations of
        char_traits<char8_t> and u8string.
        * include/c_global/cstddef: Add __byte_operand<char8_t>.
        * include/experimental/bits/fs_path.h (path::__is_encoded_char):
        Recognize char8_t.
        (path::u8string): Return std::u8string when char8_t support is
        enabled.
        (path::generic_u8string): Likewise.
        (path::_S_convert): Handle conversion from char8_t input.
        (path::_S_str_convert): Likewise.
        * include/experimental/string: Add u8string.
        * include/experimental/string_view: Add u8string_view,
        hash<experimental::u8string_view>, and
        operator""sv(const char8_t*, size_t).
        * include/std/atomic: Add atomic<char8_t> and atomic_char8_t.
        * include/std/charconv (__is_int_to_chars_type): Recognize char8_t
        as a character type.
        * include/std/limits: Add numeric_limits<char8_t>.
        * include/std/string_view: Add u8string_view,
        hash<experimental::u8string_view>, and
        operator""sv(const char8_t*, size_t).
        * include/std/type_traits: Add __is_integral_helper<char8_t>,
        __make_unsigned<char8_t>, and __make_signed<char8_t>.
        * libsupc++/atomic_lockfree_defines.h: Define
        ATOMIC_CHAR8_T_LOCK_FREE.
        * src/c++11/Makefile.am: Compile with -fchar8_t when compiling
        codecvt.cc and limits.cc so that char8_t specializations of
        numeric_limits and codecvt and emitted.
        * src/c++11/Makefile.in: Likewise.
        * src/c++11/codecvt.cc: Define members of
        codecvt<char16_t, char8_t, mbstate_t>,
        codecvt<char32_t, char8_t, mbstate_t>,
        codecvt_byname<char16_t, char8_t, mbstate_t>, and
        codecvt_byname<char32_t, char8_t, mbstate_t>.
        * src/c++11/limits.cc: Define members of
        numeric_limits<char8_t>.
        * src/c++98/Makefile.am: Compile with -fchar8_t when compiling
        locale_init.cc and localename.cc.
        * src/c++98/Makefile.in: Likewise.
        * src/c++98/locale_init.cc: Add initialization for the
        codecvt<char16_t, char8_t, mbstate_t> and
        codecvt<char32_t, char8_t, mbstate_t> facets.
        * src/c++98/localename.cc: Likewise.
        * testsuite/util/testsuite_abi.cc: Validate ABI bump.

2019-02-18  Wilco Dijkstra  <wdijkstr@arm.com>

        * 27_io/filesystem/operations/all.cc: Add dg-require-filesystem-ts.
        * 27_io/filesystem/operations/resize_file.cc: Likewise.
        * 27_io/filesystem/path/generation/normal2.cc: Likewise.

2019-02-14  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2020.xml: Update P0887R1 status.
        * doc/html/*: Regenerate.

        * doc/xml/manual/status_cxx2017.xml: Add P0063R3 to status table.
        * doc/html/*: Regenerate.

        * doc/xml/manual/intro.xml: Document LWG 2586 status.
        * include/bits/uses_allocator.h (__uses_alloc): Use const lvalue
        allocator type in is_constructible checks.
        * testsuite/20_util/scoped_allocator/69293_neg.cc: Adjust dg-error.
        * testsuite/20_util/scoped_allocator/dr2586.cc: New test.
        * testsuite/20_util/tuple/cons/allocators.cc: Add test using
        problematic type from LWG 2586 discussion.
        * testsuite/20_util/uses_allocator/69293_neg.cc: Adjust dg-error.
        * testsuite/20_util/uses_allocator/cons_neg.cc: Likewise.

        * configure.ac: Check for C11 timespec_get function.
        * crossconfig.m4 (freebsd, linux, gnu, cygwin, solaris, netbsd)
        (openbsd): Likewise
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * include/c_global/ctime (timespec, timespec_get): Add to namespace
        std for C++17 and up.

        * doc/xml/manual/intro.xml: Document LWG 2537 status.
        * include/bits/stl_queue.h
        (priority_queue(const Compare&, const Container&, const Alloc&))
        (priority_queue(const Compare&, Container&&, const Alloc&)): Call
        make_heap.
        * testsuite/23_containers/priority_queue/dr2537.cc: New test.

        * doc/xml/manual/intro.xml: Document LWG 2566 status.
        * include/bits/stl_queue.h (queue, priority_queue): Add static
        assertions to enforce LWG 2566 requirement on value_type.
        * include/bits/stl_stack.h (stack): Likewise.

        PR middle-end/89303
        * testsuite/20_util/enable_shared_from_this/89303.cc: New test.

        * doc/xml/manual/intro.xml: Document LWG 2735 status.
        * include/bits/std_abs.h: Add comment about LWG 2735.
        * testsuite/26_numerics/headers/cstdlib/dr2735.cc: New test.

2019-02-13  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89345
        * include/std/version [__cpp_impl_destroying_delete]
        (__cpp_lib_destroying_delete): Only define for C++2a and later.
        * libsupc++/new [__cpp_impl_destroying_delete]
        (__cpp_lib_destroying_delete): Likewise.
        (destroying_delete_t, destroying_delete): Likewise, but define even
        when __cpp_impl_destroying_delete is not defined.
        * testsuite/18_support/destroying_delete.cc: New test.

2019-02-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89023
        * testsuite/17_intro/headers/c++2011/parallel_mode.cc: New test.
        * testsuite/17_intro/headers/c++2014/parallel_mode.cc: New test.
        * testsuite/17_intro/headers/c++2017/parallel_mode.cc: New test.
        * testsuite/28_regex/headers/regex/parallel_mode.cc: Remove.

2019-02-09  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/71044
        * include/bits/fs_path.h (path::has_root_name)
        (path::has_root_directory, path::has_root_path)
        (path::has_relative_path, path::has_parent_path)
        (path::has_filename, path::has_stem, path::has_extension)
        (path::is_absolute, path::is_relative, path::_M_find_extension): Add
        noexcept.
        * src/c++17/fs_path.cc (path::has_root_name)
        (path::has_root_directory, path::has_root_path)
        (path::has_relative_path, path::has_parent_path)
        (path::has_filename, path::_M_find_extension): Add noexcept.

2019-02-06  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89102 (partial)
        * include/std/type_traits (common_type<>): Define.
        (common_type<T>): Derive from common_type<T, T>.
        * testsuite/20_util/common_type/requirements/explicit_instantiation.cc:
        Test zero-length template argument list.
        * testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
        Test additional single argument cases.
        * testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
        Adjust expected error.

2019-02-05  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89128
        * include/bits/stl_queue.h (queue, priority_queue): Add deduction
        guides.
        * include/bits/stl_stack.h (stack): Likewise.
        * testsuite/23_containers/priority_queue/deduction.cc: New test.
        * testsuite/23_containers/queue/deduction.cc: New test.
        * testsuite/23_containers/stack/deduction.cc: New test.

        PR libstdc++/89194
        * include/std/type_traits (__is_convertible_helper)
        (__is_convertible_helper<_From, _To, false>): Revert changes to
        support is_nothrow_convertible.
        (__is_nt_convertible_helper): New helper.
        (is_nothrow_convertible): Use __is_nt_convertible_helper.

        * testsuite/23_containers/vector/modifiers/push_back/49836.cc: Restore
        use of CopyConsOnlyType, but also test DelAnyAssign for completeness.

        PR libstdc++/89130
        * include/bits/alloc_traits.h (__is_copy_insertable_impl): Rename to
        __is_alloc_insertable_impl. Replace single type member with two
        members, one for each of copy and move insertable.
        (__is_move_insertable): New trait for internal use.
        * include/bits/stl_vector.h (vector::_S_nothrow_relocate(true_type))
        (vector::_S_nothrow_relocate(true_type)): New functions to
        conditionally check if __relocate_a can throw.
        (vector::_S_use_relocate()): Dispatch to _S_nothrow_relocate based
        on __is_move_insertable.
        (vector::_S_do_relocate): New overloaded functions to conditionally
        call __relocate_a.
        (vector::_S_relocate): New function that dispatches to _S_do_relocate
        based on _S_use_relocate.
        * include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
        (vector::_M_default_append): Call _S_relocate instead of __relocate_a.
        * testsuite/23_containers/vector/modifiers/push_back/89130.cc: New.

        PR libstdc++/89090
        * include/bits/stl_uninitialized.h (__relocate_a_1): Make unused
        parameter unnamed. Add message to static assertion.
        * include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
        (vector::_M_default_append): Use _GLIBCXX17_CONSTEXPR for if constexpr
        in C++11 code.

2019-02-05  Marc Glisse  <marc.glisse@inria.fr>

        PR libstdc++/87106
        * include/bits/stl_uninitialized.h (__is_trivially_relocatable):
        Rename...
        (__is_bitwise_relocatable): ... to this.
        (__relocate_a_1): Adapt.
        * include/bits/stl_deque.h (__is_trivially_relocatable): Rename...
        (__is_bitwise_relocatable): ... to this.

2019-01-30  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/89117
        * src/c++17/fs_path.cc (path::replace_extension): Erase extension from
        final component as well as from _M_pathname. Append the dot using
        operator+= instead of only to _M_pathname.
        (path::_M_find_extension): Reformat slightly.
        * testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
        Add more test cases.

2019-01-30  Ulrich Drepper  <drepper@redhat.com>

        * doc/xml/manual/status_cxx2020.xml: Update P0600 entry.

2019-01-29  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/26_numerics/headers/complex/synopsis.cc: Remove incorrect
        constexpr specifiers from arg and proj.

        * config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add missing exports for
        __shared_ptr instantiations used by gcc4-compatible ABI.

        * include/experimental/forward_list (experimental::erase): Qualify
        call to erase_if.
        * include/experimental/list (experimental::erase): Likewise.
        * include/std/forward_list (std::erase): Likewise.
        * include/std/list (std::erase): Likewise.

        * testsuite/20_util/reference_wrapper/result_type.cc: Disable for
        C++2a.
        * testsuite/20_util/reference_wrapper/typedefs-2.cc: Likewise.
        * testsuite/20_util/reference_wrapper/typedefs-3.cc: Likewise.
        * testsuite/20_util/reference_wrapper/typedefs.cc: Likewise.
        * testsuite/30_threads/async/54297.cc: Suppress nodiscard warning.
        * testsuite/ext/array_allocator/26875.cc: Likewise.
        * testsuite/ext/pool_allocator/allocate_chunk.cc: Likewise.
        * testsuite/util/replacement_memory_operators.h: Likewise.
        * testsuite/util/testsuite_allocator.h: Likewise.

        * include/std/memory_resource (__pool_resource::_M_unpooled): Use
        normal mode vector, even for debug mode.
        * include/std/vector [_GLIBCXX_DEBUG] (_GLIBCXX_STD_C::pmr::vector):
        Define alias template for normal mode vector.

2019-01-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/68737
        * config/locale/generic/c_locale.h (__convert_from_v)
        [_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF.
        * config/os/hpux/os_defines.h: Define _GLIBCXX_HAVE_BROKEN_VSNPRINTF.
        * include/bits/locale_facets.tcc (num_put::_M_insert_float)
        [_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF.

2019-01-24  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88840
        * include/bits/stl_vector.h (vector::__use_relocate): Replace static
        data member with static member function _S_use_relocate().
        * include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
        (vector::_M_default_append): Use _S_use_relocate() instead of
        __use_relocate.

        * testsuite/27_io/filesystem/path/compare/strings.cc: Only compare
        sign of results.

2019-01-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88740
        * testsuite/util/testsuite_hooks.h [stderr] (VERIFY): Use fprintf to
        write to stderr instead of using printf.

2019-01-21  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/86590
        * include/bits/char_traits.h (__constant_string_p,
        __constant_char_array_p): Use __builtin_is_constant_evaluated if
        available.

2019-01-20  Ulrich Drepper  <drepper@redhat.com>

        Implement C++20 P0600r1.
        * include/backward/hash_map: Add nodiscard attribute to empty.
        * include/backward/hash_set: Likewise.
        * backward/hashtable.h: Likewise.
        * include/bits/basic_string.h: Likewise.
        * include/bits/forward_list.h: Likewise.
        * include/bits/hashtable.h: Likewise.
        * include/bits/regex.h: Likewise.
        * include/bits/stl_deque.h: Likewise.
        * include/bits/stl_list.h: Likewise.
        * include/bits/stl_map.h: Likewise.
        * include/bits/stl_multimap.h: Likewise.
        * include/bits/stl_multiset.h: Likewise.
        * include/bits/stl_queue.h: Likewise.
        * include/bits/stl_set.h: Likewise.
        * include/bits/stl_stack.h: Likewise.
        * include/bits/stl_tree.h: Likewise.
        * include/bits/stl_vector.h: Likewise.
        * include/bits/unordered_map.h: Likewise.
        * include/bits/unordered_set.h: Likewise.
        * include/debug/array: Likewise.
        * include/experimental/any: Likewise.
        * include/experimental/bits/fs_path.h: Likewise.
        * include/experimental/internet: Likewise.
        * include/experimental/string_view: Likewise.
        * include/ext/pb_ds/detail/bin_search_tree_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp:
        Likewise.
        * include/ext/pb_ds/detail/binary_heap_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp:
        Likewise.
        * include/ext/pb_ds/detail/cc_hash_table_map_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/cc_hash_table_map_/size_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/gp_hash_table_map_/gp_ht_map_.hpp:
        Likewise.
        * include/ext/pb_ds/detail/gp_hash_table_map_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/left_child_next_sibling_heap_/
        info_fn_imps.hpp: Likewise.
        * include/ext/pb_ds/detail/left_child_next_sibling_heap_/
        left_child_next_sibling_heap_.hpp: Likewise.
        * include/ext/pb_ds/detail/list_update_map_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/list_update_map_/lu_map_.hpp:
        Likewise.
        * include/ext/pb_ds/detail/ov_tree_map_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/ov_tree_map_/ov_tree_map_.hp:
        Likewise.
        * include/ext/pb_ds/detail/pat_trie_/info_fn_imps.hpp:
        Likewise.
        * include/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:
        Likewise.
        * include/ext/pb_ds/detail/rc_binomial_heap_/rc.hpp:
        Likewise.
        * include/ext/pb_ds/detail/tree_trace_base.hpp: Likewise.
        * include/ext/pb_ds/trie_policy.hpp: Likewise.
        * include/ext/rope: Likewise.
        * include/ext/slist: Likewise.
        * include/ext/vstring.h: Likewise.
        * include/profile/array: Likewise.
        * include/std/array: Likewise.
        * include/tr1/array: Likewise.
        * include/tr1/hashtable.h: Likewise.
        * include/tr1/regex: Likewise.
        * include/tr2/dynamic_bitset: Likewise.
        * include/bits/alloc_traits.h: Add nodiscard attribute to
        allocate.
        * include/experimental/memory_resource: Likewise.
        * include/ext/alloc_traits.h: Likewise.
        * include/ext/array_allocator.h: Likewise.
        * include/ext/bitmap_allocator.h: Likewise.
        * include/ext/debug_allocator.h: Likewise.
        * include/ext/extptr_allocator.h: Likewise.
        * include/ext/mt_allocator.h: Likewise.
        * include/ext/new_allocator.h: Likewise.
        * include/ext/pool_allocator.h: Likewise.
        * include/ext/throw_allocator.h: Likewise.
        * include/std/scoped_allocator: Likewise.
        * libsupc++/eh_alloc.cc: Likewise.
        * include/std/future: Add nodiscard attribute to async.
        * libsupc++/new: Add nodiscard attribute to new.

2019-01-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/87514
        PR libstdc++/87520
        PR libstdc++/88782
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export new symbol.
        * include/bits/shared_ptr.h
        (shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...))
        (allocate_shared): Change to use new tag type.
        * include/bits/shared_ptr_base.h (_Sp_make_shared_tag::_S_eq):
        Declare new member function.
        (_Sp_alloc_shared_tag): Define new type.
        (_Sp_counted_ptr_inplace): Declare __shared_count<_Lp> as a friend.
        (_Sp_counted_ptr_inplace::_M_get_deleter) [!__cpp_rtti]: Use
        _Sp_make_shared_tag::_S_eq to check type_info.
        (__shared_count(Ptr, Deleter),__shared_count(Ptr, Deleter, Alloc)):
        Constrain to prevent being called with _Sp_alloc_shared_tag.
        (__shared_count(_Sp_make_shared_tag, const _Alloc&, Args&&...)):
        Replace constructor with ...
        (__shared_count(Tp*&, _Sp_alloc_shared_tag<_Alloc>, Args&&...)): Use
        reference parameter so address of the new object can be returned to
        the caller. Obtain the allocator from the tag type.
        (__shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...)): Replace
        constructor with ...
        (__shared_ptr(_Sp_alloc_shared_tag<Alloc>, Args&&...)): Pass _M_ptr
        to the __shared_count constructor.
        (__allocate_shared): Change to use new tag type.
        * src/c++11/shared_ptr.cc (_Sp_make_shared_tag::_S_eq): Define.

2019-01-17  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_ops.cc
        (equivalent(const path&, const path&, error_code&))
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use GetFileInformationByHandle to
        compare files instead of relying on incomplete info returned by stat.

        PR libstdc++/88884
        * src/c++17/fs_ops.cc (absolute(const path&, error_code&)): Do nothing
        if the path is already absolute.
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Normalize root-directory.
        [!_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Pass error_code to current_path.

        PR libstdc++/88881
        * src/c++17/fs_ops.cc (canonical(const path&, error_code&))
        [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Normalize path, to match behaviour
        of filesystem::exists.
        (create_directories(const path&, error_code&)): Add assertions.
        (status(const path&, error_code&)) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]:
        Add workaround for bug in _wstat for paths with trailing slash.
        * testsuite/27_io/filesystem/operations/create_directories.cc: Adjust
        for expected behaviour on mingw.
        * testsuite/experimental/filesystem/operations/create_directories.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/temp_directory_path.cc: Use
        "TMP" instead of "TMPDIR" and clean environment before each test. Do
        not test permissions on mingw targets.

2019-01-16  Jonathan Wakely  <jwakely@redhat.com>

        * config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add exports for fstream
        constructors and open members taking wide strings. Fix patterns for
        filesystem::path members to match wstring_view parameters. Add
        exports for shared_ptr members used by directory iterators.
        * src/c++17/fs_ops.cc (remove(const path&, error_code&)): Clear the
        error code parameter if the file doesn't exist.
        * src/filesystem/ops.cc (remove(const path&, error_code&)):
        Likewise.
        * testsuite/27_io/filesystem/operations/canonical.cc: Fix expected
        values for mingw targets, where "/" is not an absolute path. Do not
        test symlinks on mingw targets.
        * testsuite/experimental/filesystem/operations/canonical.cc: Likewise.
        * testsuite/27_io/filesystem/operations/copy.cc: Do not test symlinks
        on mingw targets.
        * testsuite/experimental/filesystem/operations/copy.cc: Likewise.
        * testsuite/27_io/filesystem/operations/create_directories.cc: Check
        that each component of the path is created.
        * testsuite/experimental/filesystem/operations/create_directories.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/exists.cc: Do not test
        permissions on mingw targets.
        * testsuite/experimental/filesystem/operations/exists.cc: Likewise.
        * testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
        * testsuite/experimental/filesystem/operations/is_empty.cc: Likewise.
        * testsuite/27_io/filesystem/operations/permissions.cc: XFAIL for
        mingw targets.
        * testsuite/experimental/filesystem/operations/permissions.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/remove.cc: Do not test
        symlinks or permissions on mingw targets.
        * testsuite/experimental/filesystem/operations/remove.cc: Likewise.
        * testsuite/27_io/filesystem/operations/remove_all.cc: Do not test
        symlinks on mingw targets.
        * testsuite/experimental/filesystem/operations/remove_all.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/status.cc: Do not test
        permissions on mingw targets.
        * testsuite/27_io/filesystem/operations/weakly_canonical.cc: Do not
        test symlinks on mingw targets.
        * testsuite/experimental/filesystem/operations/space.cc: Fix test
        for mingw targets.

2019-02-14  Ulrich Drepper  <drepper@redhat.com>

        PR libstdc++/88738
        Warn about unused comparisons of shared_ptr/unique_ptr
        * include/bits/c++config [_GLIBCXX_NODISCARD]: Define.
        * include/bits/shared_ptr.h: Use it for operator ==, !=,
        <, <=, >, >= for shared_ptr.
        * include/bits/unique_ptr.h: Likewise for unique_ptr.

2019-01-15  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_base.h (__cpp_lib_shared_ptr_arrays): Define
        as 201611L, because P0497R0 changes are supported.
        * include/std/version (__cpp_lib_shared_ptr_arrays): Likewise.

        * include/bits/erase_if.h [__cplusplus > 201703L]
        (__cpp_lib_erase_if): Only define for C++2a.
        * include/std/iterator [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
        (__cpp_lib_null_iterators): Define.
        * include/std/version [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
        (__cpp_lib_null_iterators): Define.
        [__cpp_impl_destroying_delete] (__cpp_lib_destroying_delete): Define.

        * doc/xml/manual/status_cxx2017.xml: Document P0032R3 and P0307R2
        status.
        * include/bits/stl_uninitialized.h (__cpp_lib_raw_memory_algorithms):
        Define.
        * include/std/any (__cpp_lib_any): Define as 201606L, because P0032R3
        changes are supported.
        * include/std/optional (__cpp_lib_optional): Likewise.
        * include/std/variant (__cpp_lib_variant): Likewise.
        * include/std/version [!__STRICT_ANSI__]
        (__cpp_lib_uncaught_exceptions): Define as long integer.
        [__cplusplus >= 201703L] (__cpp_lib_any)
        (__cpp_lib_raw_memory_algorithms, __cpp_lib_uncaught_exceptions)
        (__cpp_lib_variant): Define for C++17.
        [__cplusplus >= 201703L] (__cpp_lib_optional): Update value and define
        as long integer.
        * libsupc++/exception (__cpp_lib_uncaught_exceptions): Define as long
        integer.

        * doc/xml/manual/status_cxx2020.xml: Update P1123R0 status.

2019-01-12  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88811
        PR libstdc++/83306
        * src/filesystem/path.cc: Fix typo. If first path is empty, show []
        before second path.
        * testsuite/experimental/filesystem/filesystem_error/cons.cc: New
        test.

2019-01-11  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/intro.xml: Include new section.
        * doc/xml/manual/status_cxx2017.xml: Document more
        implementation-defined properties of the library.
        * doc/xml/manual/status_cxx2020.xml: Document C++2a status.
        * doc/html/*: Regenerate.

        * include/bits/refwrap.h [__cplusplus > 201703L]
        (_Refwrap_base_arg1, _Refwrap_base_arg2, _Reference_wrapper_base)
        (_Reference_wrapper_base_memfun): Do not define for C++2a.
        (reference_wrapper): Do not derive from _Reference_wrapper_base_memfun
        for C++2a.
        (reference_wrapper::operator()): Add static assertion.
        * testsuite/20_util/reference_wrapper/incomplete.cc: New test.

        * include/std/chrono (duration_values::zero(), duration_values::min())
        (duration_values::max()): Add noexcept.
        (duration::zero(), duration::min(), duration::max()): Likewise.
        (time_point::zero(), time_point::min(), time_point::max()): Likewise.
        * testsuite/20_util/duration/requirements/noexcept.cc: New test.
        * testsuite/20_util/time_point/requirements/noexcept.cc: New test.

        * include/std/version (__cpp_lib_erase_if): Move to C++20 group.

2019-01-11  Jakub Jelinek  <jakub@redhat.com>

        * include/std/type_traits (__cpp_lib_is_constant_evaluated): Define.
        * include/std/version (__cpp_lib_is_constant_evaluated): Define.

2019-01-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88802
        * include/bits/functional_hash.h (hash<nullptr_t>): Define
        specialization for C++17 (P0513R0, LWG 2817).
        * testsuite/20_util/hash/nullptr.cc: New test.

        PR libstdc++/88125
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.6): Remove unused duplicate
        pattern for std::basic_stringbuf::str().

        * config/abi/pre/gnu.ver (GLIBCXX_3.4): Correct recent changes to
        basic_ostream::operator<< patterns.

2019-01-10  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/27_io/filesystem/operations/last_write_time.cc: Fix
        test failures on targets with 32-bit time_t.

        * include/bits/erase_if.h: Define __cpp_lib_erase_if.
        * include/std/deque: Likewise.
        * include/std/forward_list: Likewise.
        * include/std/list: Likewise.
        * include/std/string: Likewise.
        * include/std/vector: Likewise.
        * include/std/version: Likewise.
        * testsuite/21_strings/basic_string/erasure.cc: Test macro.
        * testsuite/23_containers/deque/erasure.cc: Likewise.
        * testsuite/23_containers/forward_list/erasure.cc: Likewise.
        * testsuite/23_containers/list/erasure.cc: Likewise.
        * testsuite/23_containers/map/erasure.cc: Likewise.
        * testsuite/23_containers/set/erasure.cc: Likewise.
        * testsuite/23_containers/unordered_map/erasure.cc: Likewise.
        * testsuite/23_containers/unordered_set/erasure.cc: Likewise.
        * testsuite/23_containers/vector/erasure.cc: Likewise.

        * include/experimental/internet [AI_NUMERICSERV]
        (resolver_base::numeric_service): Define conditionally.
        * testsuite/experimental/net/internet/resolver/base.cc: Test it
        conditionally.
        * testsuite/experimental/net/internet/resolver/ops/lookup.cc:
        Likewise.

2019-01-10  Ville Voutilainen  <ville.voutilainen@gmail.com>
            Jonathan Wakely  <jwakely@redhat.com>

        Implement LWG 2221
        * config/abi/pre/gnu.ver (GLIBCXX_3.4): Tighten patterns.
        (GLIBCXX_3.4.26): Add new exports.
        * include/Makefile.am: Add ostream-inst.cc. Move string-inst.cc to
        correct list of sources.
        * include/Makefile.in: Regenerate.
        * include/std/ostream (operator<<(nullptr_t)): New member function.
        * src/c++17/ostream-inst.cc: New file.
        * testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc: New
        test.

2019-01-10  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_fs.h (nonexistent_path): Include name
        of the source file containing the caller.
        * testsuite/27_io/filesystem/iterators/directory_iterator.cc: Remove
        directories created by test.
        * testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
        Likewise.
        * testsuite/experimental/filesystem/iterators/directory_iterator.cc:
        Likewise.
        * testsuite/experimental/filesystem/iterators/
        recursive_directory_iterator.cc: Likewise.

2019-01-10  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/88775
        * include/bits/stl_function.h (greater<_Tp*>::operator(),
        less<_Tp*>::operator(), greater_equal<_Tp*>::operator(),
        less_equal<_Tp*>::operator()): Use __builtin_is_constant_evaluated
        instead of __builtin_constant_p if available.  Don't bother with
        the pointer comparison in C++11 and earlier.

2019-01-09  Sandra Loosemore  <sandra@codesourcery.com>

        PR other/16615

        * include/ext/bitmap_allocator.h: Mechanically replace "can not"
        with "cannot".

2019-01-09  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/libstdc++-prettyprinters/cxx17.cc: Fix expected output
        for filesystem::path. Give variables more distinctive names.

        * include/std/optional (_Optional_payload_base::_M_copy_assign): New
        member function to perform non-trivial assignment.
        (_Optional_payload_base::_M_move_assign): Likewise.
        (_Optional_payload<T, true, false, true>::operator=)
        (_Optional_payload<T, true, true, false>::operator=)
        (_Optional_payload<T, true, false, false>::operator=): Call
        _M_copy_assign and/or _M_move_assign to do non-trivial assignments.

        PR libstdc++/88204
        * testsuite/26_numerics/complex/operators/more_constexpr.cc: Do not
        test std::complex<long double> if long double format is IBM128.
        * testsuite/26_numerics/complex/requirements/more_constexpr.cc:
        Likewise.

2019-01-08  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/libstdc++-prettyprinters/compat.cc: Test printer support
        for old std::unique_ptr layout.
        * testsuite/libstdc++-prettyprinters/cxx17.cc: Fix std::variant test
        to become valueless. Add filesystem::path tests.

        PR libstdc++/87855
        * include/std/optional (_Optional_payload_base): New class template
        for common code hoisted from _Optional_payload specializations. Use
        a template for the union, to allow a partial specialization for
        types with non-trivial destructors. Add constructors for in-place
        initialization to the union.
        (_Optional_payload(bool, const _Optional_payload&)): Use _M_construct
        to perform non-trivial copy construction, instead of relying on
        non-standard copy elision in a delegating constructor.
        (_Optional_payload(bool, _Optional_payload&&)): Likewise for
        non-trivial move construction.
        (_Optional_payload): Derive from _Optional_payload_base and use it
        for everything except the non-trivial assignment operators, which are
        defined as needed.
        (_Optional_payload<false, C, M>): Derive from the specialization
        _Optional_payload<true, false, false> and add a destructor.
        (_Optional_base_impl::_M_destruct, _Optional_base_impl::_M_reset):
        Forward to corresponding members of _Optional_payload.
        (_Optional_base_impl::_M_is_engaged, _Optional_base_impl::_M_get):
        Hoist common members from _Optional_base.
        (_Optional_base): Make all members and base class public.
        (_Optional_base::_M_get, _Optional_base::_M_is_engaged): Move to
        _Optional_base_impl.
        * python/libstdcxx/v6/printers.py (StdExpOptionalPrinter): Add
        support for new std::optional layout.
        * testsuite/libstdc++-prettyprinters/compat.cc: New test.

        PR libstdc++/88066
        * include/bits/locale_conv.h: Use <> for includes not "".
        * include/ext/random: Likewise.
        * include/ext/vstring.h: Likewise.

2019-01-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        * config/abi/pre/gnu.ver (GLIBCXX_3.4): Tighten existing patterns.
        (GLIBCXX_3.4.21): Likewise.

2019-01-08  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88749
        * src/filesystem/ops.cc (last_write_time): Fix preprocessor condition
        to match the one that controls whether utimbuf and utime are declared.

2019-01-07  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/87787
        * include/bits/char_traits.h (char_traits::move): Do not pass null
        pointers to memmove.
        * include/bits/locale_facets.h
        (ctype<char>::widen(const char*, const char*, char*)): Do not
        pass null pointers to memcpy.
        (ctype<char>::narrow(const char*, const char*, char, char*)):
        Likewise.
        (ctype<char>::do_widen(const char*, const char*, char*)):
        Likewise.
        (ctype<char>::do_narrow(const char*, const char*, char, char*)):
        Likewise.

        * doc/xml/manual/spine.xml: Update copyright years.
        * doc/xml/manual/status_cxx2017.xml: Adjust note about -lstdc++fs.
        * doc/xml/manual/using.xml: Remove requirement to link with -lstdc++fs
        for C++17 filesystem library.
        * doc/html/*: Regenerate.

        * acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for truncate.
        * config.h.in: Regenerate.
        * config/abi/pre/gnu.ver: Order patterns for filesystem operations
        alphabetically and add missing entries for copy_symlink,
        hard_link_count, rename, and resize_file.
        * configure: Regenerate.
        * src/c++17/fs_ops.cc (resize_file): Remove #if so posix::truncate is
        used unconditionally.
        * src/filesystem/ops-common.h (__gnu_posix::truncate)
        [!_GLIBCXX_HAVE_TRUNCATE]: Provide fallback definition that only
        supports truncating to zero length.
        * testsuite/27_io/filesystem/operations/all.cc: New test.
        * testsuite/27_io/filesystem/operations/resize_file.cc: New test.

2019-01-06  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/86756
        * acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for utime and
        lstat and define _GLIBCXX_USE_UTIME and _GLIBCXX_USE_LSTAT.
        * config.h.in: Regenerate.
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export symbols for
        remaining std::filesystem types and functions.
        * configure: Regenerate.
        * src/c++17/Makefile.am: Add C++17 filesystem sources.
        * src/c++17/Makefile.in: Regenerate.
        * src/c++17/cow-fs_dir.cc: Move src/filesystem/cow-std-dir.cc to
        here, and change name of included file.
        * src/c++17/cow-fs_ops.cc: Move src/filesystem/cow-std-ops.cc to
        here, and change name of included file.
        * src/c++17/fs_dir.cc: Move src/filesystem/std-dir.cc to here. Change
        path to dir-common.h.
        * src/c++17/fs_ops.cc: Move src/filesystem/std-ops.cc to here. Change
        path to ops-common.h. Disable -Wunused-parameter warnings.
        (internal_file_clock): Define unconditionally.
        [!_GLIBCXX_HAVE_SYS_STAT_H] (internal_file_clock::from_stat): Do not
        define.
        (do_copy_file, do_space): Move definitions to ops.common.h.
        (copy, file_size, hard_link_count, last_write_time, space): Only
        perform operation when _GLIBCXX_HAVE_SYS_STAT_H is defined, otherwise
        report an error.
        (last_write_time, read_symlink): Remove unused attributes from
        parameters.
        * src/filesystem/Makefile.am: Remove C++17 filesystem sources.
        * src/filesystem/Makefile.in: Regenerate.
        * src/filesystem/cow-std-dir.cc: Move to src/c++17/cow-fs_dir.cc.
        * src/filesystem/cow-std-ops.cc: Move to src/c++17/cow-fs_ops.cc.
        * src/filesystem/std-dir.cc: Move to src/c++17/fs_dir.cc.
        * src/filesystem/std-ops.cc: Move to src/c++17/fs_ops.cc.
        * src/filesystem/dir-common.h [!_GLIBCXX_HAVE_DIRENT_H]: Define
        dummy types and functions instead of using #error.
        * src/filesystem/dir.cc [!_GLIBCXX_HAVE_DIRENT_H]: Use #error.
        * src/filesystem/ops-common.h [!_GLIBCXX_USE_LSTAT] (lstat): Define
        in terms of stat.
        [!_GLIBCXX_HAVE_UNISTD_H]: Define dummy types and functions.
        (do_copy_file, do_space): Move definitions here from std-ops.cc.
        * src/filesystem/ops.cc: Adjust calls to do_copy_file and do_space
        to account for new namespace.
        * testsuite/27_io/filesystem/directory_entry/86597.cc: Remove
        -lstdc++fs from dg-options.
        * testsuite/27_io/filesystem/directory_entry/lwg3171.cc: Likewise.
        * testsuite/27_io/filesystem/file_status/1.cc: Likewise.
        * testsuite/27_io/filesystem/filesystem_error/cons.cc: Likewise.
        * testsuite/27_io/filesystem/filesystem_error/copy.cc: Likewise.
        * testsuite/27_io/filesystem/iterators/directory_iterator.cc:
        Likewise.
        * testsuite/27_io/filesystem/iterators/pop.cc: Likewise.
        * testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/absolute.cc: Likewise.
        * testsuite/27_io/filesystem/operations/canonical.cc: Likewise.
        * testsuite/27_io/filesystem/operations/copy.cc: Likewise.
        * testsuite/27_io/filesystem/operations/copy_file.cc: Likewise.
        * testsuite/27_io/filesystem/operations/create_directories.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/create_directory.cc: Likewise.
        * testsuite/27_io/filesystem/operations/create_symlink.cc: Likewise.
        * testsuite/27_io/filesystem/operations/current_path.cc: Likewise.
        * testsuite/27_io/filesystem/operations/equivalent.cc: Likewise.
        * testsuite/27_io/filesystem/operations/exists.cc: Likewise.
        * testsuite/27_io/filesystem/operations/file_size.cc: Likewise.
        * testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
        * testsuite/27_io/filesystem/operations/last_write_time.cc: Likewise.
        * testsuite/27_io/filesystem/operations/permissions.cc: Likewise.
        * testsuite/27_io/filesystem/operations/proximate.cc: Likewise.
        * testsuite/27_io/filesystem/operations/read_symlink.cc: Likewise.
        * testsuite/27_io/filesystem/operations/relative.cc: Likewise.
        * testsuite/27_io/filesystem/operations/remove.cc: Likewise.
        * testsuite/27_io/filesystem/operations/remove_all.cc: Likewise.
        * testsuite/27_io/filesystem/operations/space.cc: Likewise.
        * testsuite/27_io/filesystem/operations/status.cc: Likewise.
        * testsuite/27_io/filesystem/operations/symlink_status.cc: Likewise.
        * testsuite/27_io/filesystem/operations/temp_directory_path.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/weakly_canonical.cc: Likewise.


        PR libstdc++/86756
        * config/abi/pre/gnu.ver (GLIBCXX_3.4): Make various patterns for
        typeinfo and vtables less greedy.
        (GLIBCXX_3.4.26): Export symbols for std::filesystem::path.
        * src/c++17/Makefile.am: Add fs_path.cc and cow-fs_path.cc.
        * src/c++17/Makefile.in: Regenerate.
        * src/c++17/cow-fs_path.cc: Move src/filesystem/cow-std-path.cc to
        here, and change name of included file.
        * src/c++17/fs_path.cc: Move src/filesystem/std-path.cc to here.
        * src/filesystem/Makefile.am: Remove std-path.cc and cow-std-path.cc
        from sources.
        * src/filesystem/Makefile.in: Regenerate.
        * src/filesystem/cow-std-path.cc: Move to src/c++17/cow-fs_path.cc.
        * src/filesystem/std-path.cc: Move to src/c++17/fs_path.cc.
        * testsuite/27_io/filesystem/path/append/path.cc: Remove -lstdc++fs
        from dg-options and remove dg-require-filesystem-ts.
        * testsuite/27_io/filesystem/path/append/source.cc: Likewise.
        * testsuite/27_io/filesystem/path/assign/assign.cc: Likewise.
        * testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
        * testsuite/27_io/filesystem/path/compare/compare.cc: Likewise.
        * testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
        * testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
        * testsuite/27_io/filesystem/path/compare/strings.cc: Likewise.
        * testsuite/27_io/filesystem/path/concat/path.cc: Likewise.
        * testsuite/27_io/filesystem/path/concat/strings.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/80762.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/default.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/format.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/locale.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/range.cc: Likewise.
        * testsuite/27_io/filesystem/path/construct/string_view.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/extension.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/filename.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/parent_path.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/relative_path.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/root_directory.cc:
        Likewise.
        * testsuite/27_io/filesystem/path/decompose/root_name.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/root_path.cc: Likewise.
        * testsuite/27_io/filesystem/path/decompose/stem.cc: Likewise.
        * testsuite/27_io/filesystem/path/generation/normal.cc: Likewise.
        * testsuite/27_io/filesystem/path/generation/normal2.cc: Likewise.
        * testsuite/27_io/filesystem/path/generation/proximate.cc: Likewise.
        * testsuite/27_io/filesystem/path/generation/relative.cc: Likewise.
        * testsuite/27_io/filesystem/path/generic/generic_string.cc: Likewise.
        * testsuite/27_io/filesystem/path/itr/components.cc: Likewise.
        * testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
        * testsuite/27_io/filesystem/path/modifiers/clear.cc: Likewise.
        * testsuite/27_io/filesystem/path/modifiers/make_preferred.cc:
        Likewise.
        * testsuite/27_io/filesystem/path/modifiers/remove_filename.cc:
        Likewise.
        * testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
        Likewise.
        * testsuite/27_io/filesystem/path/modifiers/replace_filename.cc:
        Likewise.
        * testsuite/27_io/filesystem/path/modifiers/swap.cc: Likewise.
        * testsuite/27_io/filesystem/path/native/string.cc: Likewise.
        * testsuite/27_io/filesystem/path/nonmember/append.cc: Likewise.
        * testsuite/27_io/filesystem/path/nonmember/hash_value.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/empty.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_extension.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_filename.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_parent_path.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_relative_path.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_root_directory.cc:
        Likewise.
        * testsuite/27_io/filesystem/path/query/has_root_name.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_root_path.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/has_stem.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/is_absolute.cc: Likewise.
        * testsuite/27_io/filesystem/path/query/is_relative.cc: Likewise.

        PR libstdc++/87431
        * include/std/variant (_Variant_storage<true, _Types...>::_M_valid):
        Check is_trivially_copyable instead of is_scalar.
        (variant::emplace<N, Args>(Args&&...)): If construction of the new
        contained value can throw and its type is trivially copyable then
        construct into a temporary variant and move from it, to provide the
        strong exception safety guarantee.
        (variant::emplace<N, U, Args>(initializer_list<U>, Args&&...)):
        Likewise.
        * testsuite/20_util/variant/87431.cc: New test.
        * testsuite/20_util/variant/run.cc: Adjust test so that throwing
        conversion causes valueless state.

        PR libstdc++/88607
        * testsuite/17_intro/headers/c++1998/charset.cc: New test.
        * testsuite/17_intro/headers/c++2011/charset.cc: New test.
        * testsuite/17_intro/headers/c++2014/charset.cc: New test.
        * testsuite/17_intro/headers/c++2017/charset.cc: New test.
        * testsuite/17_intro/headers/c++2020/charset.cc: New test.

2019-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/fs_fwd.h (__file_clock): Define new clock.
        (file_time_type): Redefine in terms of __file_clock.
        * src/filesystem/ops-common.h (file_time): Add FIXME comment about
        overflow.
        * src/filesystem/std-ops.cc (is_set(perm_options, perm_options)): Give
        internal linkage.
        (internal_file_lock): New helper type for accessing __file_clock.
        (do_copy_file): Use internal_file_lock to convert system time to
        file_time_type.
        (last_write_time(const path&, error_code&)): Likewise.
        (last_write_time(const path&, file_time_type, error_code&)): Likewise.

2019-01-04  Jonathan Wakely  <jwakely@redhat.com>

        * config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Make patterns less greedy
        for const member functions of std::basic_string.
        (GLIBCXX_3.4.26): Export member functions of std::basic_string added
        in C++17.
        * include/bits/basic_string.h (basic_string(__sv_wrapper, const A&)):
        Make non-standard constructor private.
        [!_GLIBCXX_USE_CXX11_ABI] (basic_string(__sv_wrapper, const A&)):
        Likewise.
        * include/bits/basic_string.tcc (std::string, std::wstring): Declare
        explicit instantiations for C++17 as well as earlier dialects.
        * src/c++17/Makefile.am: Add new source files.
        * src/c++17/Makefile.in: Regenerate.
        * src/c++17/cow-string-inst.cc: New file defining explicit
        instantiations for basic_string member functions added in C++17.
        * src/c++17/string-inst.cc: Likewise.

        * config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export allocator-extended
        copy/move constructors for old std::basic_string.
        * include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
        (basic_string::reference, basic_string::const_reference): Define
        as plain references for C++11 and later.
        (basic_string::basic_string()): Put constructor body outside
        preprocessor conditional groups.
        (basic_string::basic_string(basic_string&&)): Move _Alloc_hider
        instead of copying it.
        (basic_string::basic_string(const basic_string&, const _Alloc&)):
        Define.
        (basic_string::basic_string(basic_string&&, const _Alloc&)):
        Define.
        * include/bits/fs_path.h [!_GLIBCXX_USE_CXX11_ABI]: Remove special
        cases for old basic_string.
        * testsuite/21_strings/basic_string/cons/char/8.cc: Test
        allocator-extended constructors unconditionally. Add extra members to
        allocator type when using old string ABI.
        * testsuite/21_strings/basic_string/allocator/71964.cc: Enable test
        for old string ABI.
        * testsuite/21_strings/basic_string/cons/wchar_t/8.cc: Likewise.

        * testsuite/23_containers/list/61347.cc: Avoid spurious failure when
        -fno-inline added to test flags.

        * testsuite/21_strings/basic_string/requirements/
        explicit_instantiation/debug.cc: Remove XFAIL for old ABI.

        * testsuite/27_io/filesystem/filesystem_error/copy.cc: Fix static
        assertion failures with old std::string ABI.

        * include/bits/fs_path.h (path::_List::erase): Replace both overloads
        with ...
        (path::pop_back(), path::_M_erase_from(const_iterator)): New member
        functions that will only erase elements at the end.
        * src/filesystem/std-path.cc (path::_List::_Impl::pop_back()): Define.
        (path::_List::_Impl::_M_erase_from(const_iterator)): Define.
        (path::_List::operator=(const _List&)): Use _M_erase_from(p) instead
        of erase(p, end()).
        (path::_List::pop_back()): Define.
        (path::_List::_M_erase_from(const_iterator)): Define.
        (path::operator/=(const path&)): Use pop_back to remove last component
        and _M_erase_from to remove multiple components.
        (path::_M_append(basic_string_view<value_type>)): Likewise.
        (path::operator+=(const path&)): Likewise.
        (path::_M_concat(basic_string_view<value_type>)): Likewise.
        (path::remove_filename()): Likewise.
        (path::lexically_normal()): Use _List::_Impl iterators instead of
        path::iterator. Use pop_back to remove components from the end. Clear
        trailing filename, instead of using erase(const_iterator) to remove
        a non-final component.
        * testsuite/27_io/filesystem/path/generation/normal.cc: Test
        additional cases.
        * testsuite/27_io/filesystem/path/generation/normal2.cc: New test.

        * src/filesystem/std-path.cc (path::operator+=(const path&)): Fix
        incorrect treatment of empty filename after trailing slash.
        * testsuite/27_io/filesystem/path/concat/path.cc: Test problem case.

        * testsuite/21_strings/basic_string/modifiers/assign/char/
        move_assign_optim.cc: Avoid spurious failure when -fno-inline added
        to test flags.
        * testsuite/21_strings/basic_string/modifiers/assign/wchar_t/
        move_assign_optim.cc: Likewise.

2019-01-03  Jonathan Wakely  <jwakely@redhat.com>
            Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/88607
        * include/experimental/memory: Replace UTF-8 quote characters.
        * include/std/future: Replace UTF-8 "em dash" characters.

2019-01-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88607
        * include/bits/forward_list.h: Replace UTF-8 "ligature fi" character.
        * include/debug/forward_list: Likewise.
        * include/experimental/bits/shared_ptr.h: Remove UTF-8 "section sign"
        character.
        * include/experimental/chrono: Likewise.
        * include/experimental/functional: Likewise.
        * include/experimental/ratio: Likewise.
        * include/experimental/system_error: Likewise.
        * include/experimental/tuple: Likewise.
        * include/experimental/type_traits: Likewise.
        * include/parallel/workstealing.h: Replace UTF-8 "en dash" character.
        * include/parallel/multiseq_selection.h: Likewise.

        PR libstdc++/88681
        * config/abi/pre/gnu.ver: Add missing exports.
        * testsuite/22_locale/collate_byname/88681.cc: New test.
        * testsuite/22_locale/time_get/get/char/88681.cc: New test.
        * testsuite/22_locale/time_get/get/wchar_t/88681.cc: New test.

2019-01-02  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/23_containers/map/cons/deduction.cc: Test deduction from
        initializer_list<value_type> and from input iterator ranges.
        * testsuite/23_containers/multimap/cons/deduction.cc: Likewise.

        * testsuite/experimental/string_view/element_access/char/empty.cc:
        Fix year range in copyright header.

2019-01-02  Joel Brobecker  <brobecker@adacore.com>

        * testsuite/21_strings/basic_string_view/element_access/char/empty.cc:
        Fix year range in copyright header.

2019-01-01  Jakub Jelinek  <jakub@redhat.com>

        Update copyright years.
\f
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Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.