Tweak C++2a uses-allocator construction utilities

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

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

        * 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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