+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/atomic_timed_wait.h (__cond_wait_until): Do not
+ perform redundant conversions to the same clock.
+
+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/atomic_timed_wait.h (__cond_wait_until_impl):
+ Do not define when _GLIBCXX_HAVE_LINUX_FUTEX is defined. Use
+ __condvar and mutex instead of __gthread_cond_t and
+ unique_lock<mutex>.
+ (__cond_wait_until): Likewise. Fix test for return value of
+ __cond_wait_until_impl.
+ (__timed_waiters::_M_do_wait_until): Use __condvar instead
+ of __gthread_cond_t.
+ * include/bits/atomic_wait.h: Remove <bits/unique_lock.h>
+ include. Only include <bits/std_mutex.h> if not using futexes.
+ (__platform_wait_max_value): Remove unused variable.
+ (__waiters::lock_t): Use lock_guard instead of unique_lock.
+ (__waiters::_M_cv): Use __condvar instead of __gthread_cond_t.
+ (__waiters::_M_do_wait(__platform_wait_t)): Likewise.
+ (__waiters::_M_notify()): Likewise. Use notify_one() if not
+ asked to notify all.
+ * include/bits/std_mutex.h (__condvar): New type.
+ * include/std/condition_variable (condition_variable::_M_cond)
+ (condition_variable::wait_until): Use __condvar instead of
+ __gthread_cond_t.
+ * src/c++11/condition_variable.cc (condition_variable): Define
+ default constructor and destructor as defaulted.
+ (condition_variable::wait, condition_variable::notify_one)
+ (condition_variable::notify_all): Forward to corresponding
+ member function of __condvar.
+
+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97936
+ * testsuite/29_atomics/atomic/wait_notify/bool.cc: Re-eneable
+ test.
+ * testsuite/29_atomics/atomic/wait_notify/generic.cc: Likewise.
+ * testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
+ * testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
+ * testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
+ * testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
+ * testsuite/util/atomic/wait_notify_util.h: Fix missed
+ notifications by making the new thread wait until the parent
+ thread is waiting on the condition variable.
+
+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97935
+ * include/bits/iterator_concepts.h (__detail::__iter_without_category):
+ New helper concept.
+ (__iterator_traits::__cat): Use __detail::__iter_without_category.
+ * testsuite/24_iterators/associated_types/iterator.traits.cc: New test.
+
+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ * testsuite/17_intro/names.cc: Do not test 'v' on AIX.
+
+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97936
+ * include/bits/atomic_wait.h (__platform_wait): Check errno,
+ not just the value of EAGAIN.
+ (__waiters::__waiters()): Fix name of data member.
+
+2020-11-25 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97936
+ * include/bits/atomic_wait.h (__platform_wait): Return if futex
+ sets EAGAIN.
+ * testsuite/30_threads/latch/3.cc: Re-enable test.
+ * testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
+
+2020-11-24 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97936
+ PR libstdc++/97944
+ * testsuite/29_atomics/atomic_integral/wait_notify.cc: Disable.
+ Do not require pthreads, but add -pthread when appropriate.
+ * testsuite/30_threads/jthread/95989.cc: Likewise.
+ * testsuite/30_threads/latch/3.cc: Likewise.
+ * testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
+
+2020-11-24 Jonathan Wakely <jwakely@redhat.com>
+
+ * testsuite/30_threads/jthread/95989.cc: Run all three test
+ functions, not just the first one twice.
+
+2020-11-24 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/67791
+ * src/c++11/thread.cc (thread::_M_start_thread(_State_ptr, void (*)())):
+ Check that gthreads is available before calling __gthread_create.
+
+2020-11-24 Jonathan Wakely <jwakely@redhat.com>
+
+ * src/c++98/locale.cc (locale::facet::_S_get_c_locale())
+ (locale::id::_M_id() const): Use __is_single_threaded.
+ * src/c++98/locale_init.cc (locale::_S_initialize()):
+ Likewise.
+
+2020-11-23 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/semaphore_base.h
+ (__platform_semaphore::_M_try_acquire_until): Fix type of
+ variable.
+
+2020-11-23 Stephan Bergmann <sbergman@redhat.com>
+
+ * include/bits/atomic_wait.h (__thread_relax, __thread_yield):
+ Add 'inline'.
+
+2020-11-23 Jonathan Wakely <jwakely@redhat.com>
+
+ * acinclude.m4 (GLIBCXX_CHECK_GTHREADS): Check for
+ * config.h.in: Regenerate.
+ * configure: Regenerate.
+ * include/bits/semaphore_base.h (_GLIBCXX_HAVE_POSIX_SEMAPHORE):
+ Check autoconf macro instead of defining it here.
+
+2020-11-23 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/atomic_wait.h: Do not define anything unless
+ gthreads or futexes are available.
+ * include/bits/atomic_timed_wait.h: Likewise.
+ * include/bits/semaphore_base.h: Likewise.
+ * include/std/semaphore: Likewise.
+ * include/bits/atomic_base.h (atomic_flag::wait)
+ (atomic_flag::notify_one, atomic_flag::notify_all)
+ (__atomic_base<I>::wait, __atomic_base<I>::notify_one)
+ (__atomic_base<I>::notify_all, __atomic_base<P*>::wait)
+ (__atomic_base<P*>::notify_one, __atomic_base<P*>::notify_all)
+ (__atomic_impl::wait, __atomic_impl::notify_one)
+ (__atomic_impl::notify_all, __atomic_float::wait)
+ (__atomic_float::notify_one, __atomic_float::notify_all)
+ (__atomic_ref::wait, __atomic_ref::notify_one)
+ (__atomic_ref::notify_all): Only define if gthreads or futexes
+ are available.
+ * include/std/atomic (atomic::wait, atomic::notify_one)
+ (atomic::notify_all): Likewise.
+ * include/std/version (__cpp_lib_semaphore): Define
+ conditionally.
+
+2020-11-23 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97948
+ * testsuite/29_atomics/atomic_float/wait_notify.cc: Add options
+ for libatomic.
+ * testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
+ * testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.
+
+2020-11-21 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/atomic_base.h (atomic_flag::wait): Use correct
+ type for __atomic_wait call.
+ * include/bits/atomic_timed_wait.h (__atomic_wait_until): Check
+ _GLIBCXX_HAVE_LINUX_FUTEX.
+ * include/bits/atomic_wait.h (__atomic_notify): Likewise.
+ * include/bits/semaphore_base.h (_GLIBCXX_HAVE_POSIX_SEMAPHORE):
+ Only define if SEM_VALUE_MAX or _POSIX_SEM_VALUE_MAX is defined.
+ * testsuite/29_atomics/atomic/wait_notify/bool.cc: Disable on
+ non-linux targes.
+ * testsuite/29_atomics/atomic/wait_notify/generic.cc: Likewise.
+ * testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
+ * testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
+ * testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
+
+2020-11-20 Thomas Rodgers <trodgers@redhat.com>
+
+ * include/Makefile.am (bits_headers): Add new header.
+ * include/Makefile.in: Regenerate.
+ * include/bits/atomic_base.h (__atomic_flag::wait): Define.
+ (__atomic_flag::notify_one): Likewise.
+ (__atomic_flag::notify_all): Likewise.
+ (__atomic_base<_Itp>::wait): Likewise.
+ (__atomic_base<_Itp>::notify_one): Likewise.
+ (__atomic_base<_Itp>::notify_all): Likewise.
+ (__atomic_base<_Ptp*>::wait): Likewise.
+ (__atomic_base<_Ptp*>::notify_one): Likewise.
+ (__atomic_base<_Ptp*>::notify_all): Likewise.
+ (__atomic_impl::wait): Likewise.
+ (__atomic_impl::notify_one): Likewise.
+ (__atomic_impl::notify_all): Likewise.
+ (__atomic_float<_Fp>::wait): Likewise.
+ (__atomic_float<_Fp>::notify_one): Likewise.
+ (__atomic_float<_Fp>::notify_all): Likewise.
+ (__atomic_ref<_Tp>::wait): Likewise.
+ (__atomic_ref<_Tp>::notify_one): Likewise.
+ (__atomic_ref<_Tp>::notify_all): Likewise.
+ (atomic_wait<_Tp>): Likewise.
+ (atomic_wait_explicit<_Tp>): Likewise.
+ (atomic_notify_one<_Tp>): Likewise.
+ (atomic_notify_all<_Tp>): Likewise.
+ * include/bits/atomic_wait.h: New file.
+ * include/bits/atomic_timed_wait.h: New file.
+ * include/bits/semaphore_base.h: New file.
+ * include/std/atomic (atomic<bool>::wait): Define.
+ (atomic<bool>::wait_one): Likewise.
+ (atomic<bool>::wait_all): Likewise.
+ (atomic<_Tp>::wait): Likewise.
+ (atomic<_Tp>::wait_one): Likewise.
+ (atomic<_Tp>::wait_all): Likewise.
+ (atomic<_Tp*>::wait): Likewise.
+ (atomic<_Tp*>::wait_one): Likewise.
+ (atomic<_Tp*>::wait_all): Likewise.
+ * include/std/latch: New file.
+ * include/std/semaphore: New file.
+ * include/std/version: Add __cpp_lib_semaphore and
+ __cpp_lib_latch defines.
+ * testsuite/29_atomics/atomic/wait_notify/bool.cc: New test.
+ * testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
+ * testsuite/29_atomics/atomic/wait_notify/generic.cc: Liekwise.
+ * testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
+ * testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
+ * testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
+ * testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.
+ * testsuite/30_threads/semaphore/1.cc: New test.
+ * testsuite/30_threads/semaphore/2.cc: Likewise.
+ * testsuite/30_threads/semaphore/least_max_value_neg.cc: Likewise.
+ * testsuite/30_threads/semaphore/try_acquire.cc: Likewise.
+ * testsuite/30_threads/semaphore/try_acquire_for.cc: Likewise.
+ * testsuite/30_threads/semaphore/try_acquire_posix.cc: Likewise.
+ * testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
+ * testsuite/30_threads/latch/1.cc: New test.
+ * testsuite/30_threads/latch/2.cc: New test.
+ * testsuite/30_threads/latch/3.cc: New test.
+ * testsuite/util/atomic/wait_notify_util.h: New File.
+
+2020-11-20 François Dumont <fdumont@gcc.gnu.org>
+
+ PR libstdc++/83938
+ * include/bits/stl_tempbuf.h (get_temporary_buffer): Change __len
+ computation in the loop to avoid truncation.
+ * include/bits/stl_algo.h:
+ (__inplace_merge): Take temporary buffer length from smallest range.
+ (__stable_sort): Limit temporary buffer length.
+ * testsuite/25_algorithms/inplace_merge/1.cc (test4): New.
+ * testsuite/performance/25_algorithms/stable_sort.cc: Test stable_sort
+ under different heap memory conditions.
+ * testsuite/performance/25_algorithms/inplace_merge.cc: New test.
+
+2020-11-20 François Dumont <fdumont@gcc.gnu.org>
+
+ * include/bits/move.h (_GLIBCXX_FWDREF): New.
+ * include/bits/stl_tree.h: Adapt to use latter.
+ (_Rb_tree<>::_M_clone_node): Add _MoveValue template parameter.
+ (_Rb_tree<>::_M_mbegin): New.
+ (_Rb_tree<>::_M_begin): Use latter.
+ (_Rb_tree<>::_M_copy): Add _MoveValues template parameter.
+ * testsuite/23_containers/map/allocator/move_cons.cc: New test.
+ * testsuite/23_containers/multimap/allocator/move_cons.cc: New test.
+ * testsuite/23_containers/multiset/allocator/move_cons.cc: New test.
+ * testsuite/23_containers/set/allocator/move_cons.cc: New test.
+
+2020-11-20 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/92546
+ * include/std/regex (pmr::smatch, pmr::wsmatch): Declare using
+ underlying __normal_iterator type, not nested typedef
+ basic_string::const_iterator.
+
+2020-11-19 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/95989
+ * config/os/gnu-linux/os_defines.h (_GLIBCXX_NATIVE_THREAD_ID):
+ Define new macro to get reliable thread ID.
+ * include/bits/std_thread.h: (this_thread::get_id): Use new
+ macro if it's defined.
+ * testsuite/30_threads/jthread/95989.cc: New test.
+ * testsuite/30_threads/this_thread/95989.cc: New test.
+
+2020-11-19 Jonathan Wakely <jwakely@redhat.com>
+
+ * testsuite/30_threads/async/async.cc: Include <thread>.
+ * testsuite/30_threads/future/members/93456.cc: Likewise.
+
+2020-11-19 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/92546
+ * include/Makefile.am: Add new <bits/std_thread.h> header.
+ * include/Makefile.in: Regenerate.
+ * include/std/future: Include new header instead of <thread>.
+ * include/std/stop_token: Include new header instead of
+ <bits/gthr.h>.
+ (stop_token::_S_yield()): Use this_thread::yield().
+ (_Stop_state_t::_M_requester): Change type to std::thread::id.
+ (_Stop_state_t::_M_request_stop()): Use this_thread::get_id().
+ (_Stop_state_t::_M_remove_callback(_Stop_cb*)): Likewise.
+ Use __is_single_threaded() to decide whether to synchronize.
+ * include/std/thread (thread, operator==, this_thread::get_id)
+ (this_thread::yield): Move to new header.
+ (operator<=>, operator!=, operator<, operator<=, operator>)
+ (operator>=, hash<thread::id>, operator<<): Define even when
+ gthreads not available.
+ * src/c++11/thread.cc: Include <memory>.
+ * include/bits/std_thread.h: New file.
+ (thread, operator==, this_thread::get_id, this_thread::yield):
+ Define even when gthreads not available.
+ [!_GLIBCXX_HAS_GTHREADS] (thread::join, thread::detach)
+ (thread::hardware_concurrency): Define inline.
+
+2020-11-19 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/93421
+ PR libstdc++/93456
+ * src/c++11/futex.cc (syscall_time_t): New typedef for
+ the type of the syscall_timespec::tv_sec member.
+ (relative_timespec, _M_futex_wait_until)
+ (_M_futex_wait_until_steady): Use syscall_time_t in overflow
+ checks, not time_t.
+
+2020-11-18 Patrick Palka <ppalka@redhat.com>
+
+ * include/std/ranges (join_view::_Iterator::_M_satisfy): Uglify
+ local variable inner.
+ (join_view::_Iterator::operator->): Use _Inner_iter instead of
+ _Outer_iter in the function signature as per LWG 3500.
+ * testsuite/std/ranges/adaptors/join.cc (test08): Test it.
+
+2020-11-17 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/93421
+ * acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Fail if struct
+ timespec isn't compatible with SYS_clock_gettime.
+ * configure: Regenerate.
+ * src/c++11/chrono.cc: Revert changes for time64 compatibility.
+ Add static_assert instead.
+ * src/c++11/futex.cc (_M_futex_wait_until_steady): Assume
+ SYS_clock_gettime can use struct timespec.
+
+2020-11-17 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97869
+ * include/precompiled/stdc++.h: Include <coroutine>.
+ * include/std/version (__cpp_lib_span): Check __cpp_lib_concepts
+ before defining.
+
+2020-11-17 Patrick Palka <ppalka@redhat.com>
+
+ PR libstdc++/97828
+ * include/bits/ranges_algo.h (__search_n_fn::operator()): Check
+ random_access_iterator before using the backtracking
+ implementation. When the backwards scan fails prematurely,
+ reset __remainder appropriately.
+ * testsuite/25_algorithms/search_n/97828.cc: New test.
+
+2020-11-16 Jonathan Wakely <jwakely@redhat.com>
+
+ * src/Makefile.am (libstdc++-symbols.ver-sun): Remove -lrt from
+ arguments passed to make_sunver.pl script.
+ * src/Makefile.in: Regenerate.
+
+2020-11-15 Jason Merrill <jason@redhat.com>
+
+ * testsuite/20_util/result_of/sfinae_friendly_1.cc: Adjust.
+
+2020-11-13 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/93421
+ * src/c++11/chrono.cc [_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL]
+ (syscall_timespec): Define a type suitable for SYS_clock_gettime
+ calls.
+ (system_clock::now(), steady_clock::now()): Use syscall_timespec
+ instead of timespec.
+ * src/c++11/futex.cc (syscall_timespec): Define a type suitable
+ for SYS_futex and SYS_clock_gettime calls.
+ (relative_timespec): Use syscall_timespec instead of timespec.
+ (__atomic_futex_unsigned_base::_M_futex_wait_until): Likewise.
+ (__atomic_futex_unsigned_base::_M_futex_wait_until_steady):
+ Likewise.
+
+2020-11-13 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/93456
+ * src/c++11/futex.cc (relative_timespec): Remove redundant check
+ negative values.
+ * testsuite/30_threads/future/members/wait_until_overflow.cc: Moved to...
+ * testsuite/30_threads/future/members/93456.cc: ...here.
+
+2020-11-13 Jonathan Wakely <jwakely@redhat.com>
+
+ * src/c++11/futex.cc (relative_timespec): Add [[unlikely]]
+ attributes.
+ (__atomic_futex_unsigned_base::_M_futex_wait_until)
+ (__atomic_futex_unsigned_base::_M_futex_wait_until_steady):
+ Check for overflow.
+ * testsuite/30_threads/future/members/wait_until_overflow.cc:
+ New test.
+
+2020-11-13 Jonathan Wakely <jwakely@redhat.com>
+
+ * src/c++11/futex.cc (relative_timespec): New function to
+ create relative time from two absolute times.
+ (__atomic_futex_unsigned_base::_M_futex_wait_until)
+ (__atomic_futex_unsigned_base::_M_futex_wait_until_steady):
+ Use relative_timespec.
+
+2020-11-13 Jonathan Wakely <jwakely@redhat.com>
+
+ * testsuite/30_threads/future/members/poll.cc: Require gthreads
+ and add -pthread for targets that require it. Relax required
+ ratio of wait_for calls before/after the future is ready.
+
+2020-11-12 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/std/future (future::wait_for): Do not wait for
+ durations less than or equal to zero.
+ * src/c++11/futex.cc (_M_futex_wait_until)
+ (_M_futex_wait_until_steady): Do not wait for timeouts before
+ the epoch.
+ * testsuite/30_threads/future/members/poll.cc: New test.
+
+2020-11-12 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/ext/numeric_traits.h (__numeric_traits): Change
+ primary template to always derive from __numeric_traits_integer.
+ (__numeric_traits<float>, __numeric_traits<double>)
+ (__numeric_traits<long double>): Add explicit specializations.
+
+2020-11-12 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97798
+ * include/ext/numeric_traits.h (__glibcxx_signed)
+ (__glibcxx_digits, __glibcxx_min, __glibcxx_max): Remove
+ macros.
+ (__is_integer_nonstrict::__width): Define new constant.
+ (__numeric_traits_integer): Define constants in terms of each
+ other and __is_integer_nonstrict::__width, rather than the
+ removed macros.
+ (_GLIBCXX_INT_N_TRAITS): Macro to define explicit
+ specializations for non-standard integer types.
+
+2020-11-11 Jonathan Yong <10walls@gmail.com>
+
+ * acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Exclude
+ cygwin and mingw from relro linker test.
+ * configure: Regenerate.
+
+2020-11-11 Paul Scharnofske <asynts@gmail.com>
+
+ * include/std/thread (jthread::operator=(jthread&&)): Transfer
+ any existing state to a temporary that will request a stop and
+ then join.
+ * testsuite/30_threads/jthread/jthread.cc: Test move assignment.
+
+2020-11-11 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/std/stop_token (_Stop_state_t::_M_requester): Define
+ new struct with members to store and check the thread ID.
+ (_Stop_state_t::_M_request_stop()): Use _M_requester._M_set().
+ (_Stop_state_t::_M_remove_callback(_Stop_cb*)): Use
+ _M_requester._M_is_current_thread().
+
+2020-11-11 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/std/ostream (__syncbuf_base): New class template.
+ (emit_on_flush, noemit_on_flush, flush_emit): New manipulators.
+ * include/std/syncstream (basic_syncbuf): Derive from
+ __syncbuf_base instead of basic_streambuf.
+ (basic_syncbuf::operator=): Remove self-assignment check.
+ (basic_syncbuf::swap): Remove self-swap check.
+ (basic_syncbuf::emit): Do not skip pubsync() call if sequence
+ is empty.
+ (basic_syncbuf::sync): Remove no-op pubsync on stringbuf.
+ (basic_syncbuf::overflow): Define override.
+ * testsuite/27_io/basic_syncstream/basic_ops/1.cc: Test
+ basic_osyncstream::put(char_type).
+ * testsuite/27_io/basic_ostream/emit/1.cc: New test.
+
+2020-11-10 Jonathan Wakely <jwakely@redhat.com>
+
+ * config/locale/generic/c_locale.cc (__set_C_locale()): New function
+ to set the "C" locale and return the name of the previous locale.
+ (__convert_to_v<float>, __convert_to_v<double>)
+ (__convert_to_v<long double>): Use __set_C_locale and set failbit on
+ error.
+
+2020-11-10 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/std/sstream (basic_stringbug, basic_istringstream)
+ (basic_ostringstream, basic_stringstream): Reorder C++20
+ constructors to be declared next to other constructors.
+
+2020-11-10 Jonathan Wakely <jwakely@redhat.com>
+
+ * config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Tighten patterns.
+ (GLIBCXX_3.4.29): Export new symbols.
+ * include/bits/alloc_traits.h (__allocator_like): New concept.
+ * include/std/sstream (basic_stringbuf::swap): Add exception
+ specification.
+ (basic_stringbuf::str() const): Add ref-qualifier. Use new
+ _M_high_mark function.
+ (basic_stringbuf::str(const SAlloc&) const): Define new function.
+ (basic_stringbuf::str() &&): Likewise.
+ (basic_stringbuf::str(const basic_string<C,T,SAlloc>&)):
+ Likewise.
+ (basic_stringbuf::str(basic_string<C,T,Alloc>&&)): Likewise.
+ (basic_stringbuf::view() const): Use _M_high_mark.
+ (basic_istringstream::str, basic_ostringstream::str)
+ (basic_stringstream::str): Define new overloads.
+ * src/c++20/sstream-inst.cc (basic_stringbuf::str)
+ (basic_istringstream::str, basic_ostringstream::str)
+ (basic_stringstream::str): Explicit instantiation definitions
+ for new overloads.
+ * testsuite/27_io/basic_istringstream/view/char/1.cc: Add more
+ checks.
+ * testsuite/27_io/basic_istringstream/view/wchar_t/1.cc:
+ Likewise.
+ * testsuite/27_io/basic_ostringstream/view/char/1.cc:
+ Likewise.
+ * testsuite/27_io/basic_ostringstream/view/wchar_t/1.cc:
+ Likewise.
+ * testsuite/27_io/basic_stringstream/view/char/1.cc:
+ Likewise.
+ * testsuite/27_io/basic_stringstream/view/wchar_t/1.cc:
+ Likewise.
+ * testsuite/27_io/basic_istringstream/str/char/2.cc: New test.
+ * testsuite/27_io/basic_istringstream/str/wchar_t/2.cc: New test.
+ * testsuite/27_io/basic_ostringstream/str/char/3.cc: New test.
+ * testsuite/27_io/basic_ostringstream/str/wchar_t/3.cc: New test.
+ * testsuite/27_io/basic_stringbuf/str/char/4.cc: New test.
+ * testsuite/27_io/basic_stringbuf/str/wchar_t/4.cc: New test.
+ * testsuite/27_io/basic_stringstream/str/char/5.cc: New test.
+ * testsuite/27_io/basic_stringstream/str/wchar_t/5.cc.cc: New test.
+
+2020-11-10 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97415
+ * include/std/sstream (basic_stringbuf::_M_update_egptr)
+ (basic_stringbuf::__xfer_bufptrs::__xfer_bufptrs): Check for
+ null before comparing pointers.
+
+2020-11-09 François Dumont <fdumont@gcc.gnu.org>
+
+ * include/debug/array: Remove.
+ * include/Makefile.am: Remove <debug/array>.
+ * include/Makefile.in: Regenerate.
+ * include/experimental/functional: Adapt.
+ * include/std/array: Move to _GLIBCXX_INLINE_VERSION namespace.
+ * include/std/functional: Adapt.
+ * include/std/span: Adapt.
+ * testsuite/23_containers/array/debug/back1_neg.cc:
+ Remove dg-require-debug-mode. Add -D_GLIBCXX_ASSERTIONS option.
+ * testsuite/23_containers/array/debug/back2_neg.cc: Likewise.
+ * testsuite/23_containers/array/debug/front1_neg.cc: Likewise.
+ * testsuite/23_containers/array/debug/front2_neg.cc: Likewise.
+ * testsuite/23_containers/array/debug/square_brackets_operator1_neg.cc:
+ Likewise.
+ * testsuite/23_containers/array/debug/square_brackets_operator2_neg.cc:
+ Likewise.
+ * testsuite/23_containers/array/element_access/60497.cc
+ * testsuite/23_containers/array/tuple_interface/get_debug_neg.cc:
+ Remove.
+ * testsuite/23_containers/array/tuple_interface/get_neg.cc
+ * testsuite/23_containers/array/tuple_interface/tuple_element_debug_neg.cc
+ * testsuite/23_containers/array/tuple_interface/tuple_element_neg.cc
+
+2020-11-09 François Dumont <fdumont@gcc.gnu.org>
+
+ * include/debug/assertions.h (__glibcxx_requires_non_empty_range):
+ Remove __builtin_expect.
+ (__glibcxx_requires_subscript): Likewise.
+ (__glibcxx_requires_nonempty): Likewise.
+ * include/debug/formatter.h (__check_singular): Add C++11 constexpr
+ qualification.
+ * include/debug/helper_functions.h (__check_singular): Likewise. Skip
+ check if constant evaluated.
+ (__valid_range): Do not skip check if constant evaluated.
+ * include/debug/macros.h (_GLIBCXX_DEBUG_VERIFY_COND_AT): Add
+ __builtin_expect.
+ (_GLIBCXX_DEBUG_VERIFY_AT_F): Use __glibcxx_assert_1.
+ * testsuite/21_strings/basic_string_view/element_access/char/back_constexpr_neg.cc:
+ New test.
+ * testsuite/21_strings/basic_string_view/element_access/char/constexpr.cc: New test.
+ * testsuite/21_strings/basic_string_view/element_access/char/constexpr_neg.cc: New test.
+ * testsuite/21_strings/basic_string_view/element_access/char/front_back_constexpr.cc:
+ New test.
+ * testsuite/21_strings/basic_string_view/element_access/char/front_constexpr_neg.cc:
+ New test.
+ * testsuite/21_strings/basic_string_view/element_access/wchar_t/back_constexpr_neg.cc:
+ New test.
+ * testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr.cc: New test.
+ * testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr_neg.cc: New test.
+ * testsuite/21_strings/basic_string_view/element_access/wchar_t/front_constexpr_neg.cc:
+ New test.
+ * testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_neg.cc: New test.
+ * testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_pred_neg.cc: New test.
+ * testsuite/25_algorithms/lower_bound/debug/constexpr_valid_range_neg.cc: New test.
+ * testsuite/25_algorithms/lower_bound/debug/partitioned_neg.cc: New test.
+ * testsuite/25_algorithms/lower_bound/debug/partitioned_pred_neg.cc: New test.
+ * testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_neg.cc: New test.
+ * testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_pred_neg.cc: New test.
+ * testsuite/25_algorithms/upper_bound/debug/constexpr_valid_range_neg.cc: New test.
+ * testsuite/25_algorithms/upper_bound/debug/partitioned_neg.cc: New test.
+ * testsuite/25_algorithms/upper_bound/debug/partitioned_pred_neg.cc: New test.
+
+2020-11-09 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/uniform_int_dist.h (__detail::_Power_of_2):
+ Document that true result for zero is intentional.
+
+2020-11-09 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/std/bit (__popcount): Remove redundant check for zero.
+
+2020-11-09 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97729
+ * libsupc++/exception_ptr.h (exception_ptr::exception_ptr())
+ (exception_ptr::exception_ptr(const exception_ptr&))
+ (exception_ptr::~exception_ptr()): Remove 'always_inline'
+ attributes. Use 'inline' unconditionally.
+
+2020-11-09 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/97758
+ * include/bits/std_function.h [!__cpp_rtti]: Include <typeinfo>.
+
2020-11-07 Liu Hao <lh_mouse@126.com>
* libsupc++/cxxabi.h: (__cxa_atexit): mark with _GLIBCXX_CDTOR_CALLABI
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