2026-01-13 Tomasz Kamiński * include/bits/stl_heap.h (std::__is_heap_until, std::__push_heap) (std::__adjust_heap): Replace subscript with dereference of advanced iterator. * testsuite/util/testsuite_iterators.h (__gnu_test::subscript_proxy) (__gnu_test::proxy_random_access_iterator_wrapper): Define. * testsuite/25_algorithms/sort_heap/check_proxy_brackets.cc: New test. 2026-01-12 Jakub Jelinek * config/abi/pre/gnu.ver (CXXABI_1.3.14): Don't export _ZTI*DF16_ on s390x. (CXXABI_1.3.17): Export _ZTI*DF16_ on s390x. * config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Remove _ZTI{,P,K}DF16_. 2026-01-12 Jonathan Wakely * src/c++20/atomic.cc (__detail::__spin_impl): Do not use reserved names for variables. 2026-01-12 Jonathan Wakely * include/bits/atomic_wait.h (__wait_args): Improve comments. * src/c++20/atomic.cc (__wait_args::_M_setup_proxy_wait): Improve comment. 2026-01-12 Tomasz Kamiński * testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon.cc: Updated test. 2026-01-10 Stefan Schulze Frielinghaus * config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Add names {,P,K}DF16. 2026-01-10 Wang Jinghao * src/c++11/system_error.cc (system_error_category) [_WIN32]: Use FormatMessageA function instead of FormatMessage macro. * testsuite/19_diagnostics/error_category/system_category.cc: Fix typo in __MINGW32__ macro name. Adjust behavior on the mingw32 target. 2026-01-10 Yuao Ma * include/bits/version.def: Add FTM. * include/bits/version.h: Regenerate. * include/std/flat_map: Add constexpr. * testsuite/23_containers/flat_map/1.cc: Add constexpr test. * testsuite/23_containers/flat_multimap/1.cc: Add constexpr test. 2026-01-09 Jonathan Wakely * src/c++20/atomic.cc (use_proxy_wait): Remove unused second parameter. (__wait_args::_M_setup_proxy_wait): Remove second argument. (__notify_impl): Likewise. 2026-01-09 Jonathan Wakely * include/bits/atomic_timed_wait.h (__atomic_wait_address_until): Use _M_on_wake instead of _M_setup_wait after waking. (__atomic_wait_address_for): Likewise. * include/bits/atomic_wait.h (__atomic_wait_address): Likewise. (__wait_args::_M_setup_wait): Remove third parameter and move code to update _M_old to ... (__wait_args::_M_on_wake): New member function to update _M_old after waking, only calling _M_setup_proxy_wait if needed. (__wait_args::_M_store): New member function to update _M_old from a value, for non-proxy waits. * src/c++20/atomic.cc (__wait_args::_M_setup_proxy_wait): If _M_obj is not addr, only load a new value and return true. 2026-01-09 Jonathan Wakely Tomasz Kamiński PR libstdc++/122878 * include/bits/semaphore_base.h (_M_try_acquire): Replace _M_try_acquire_for call with explicit loop and call to __atomic_wait_address_for. (_M_try_acquire_for): Replace loop with call to _M_try_acquire_until. 2026-01-09 Keith Packard * acinclude.m4 (GLIBCXX_CONFIGURE): Add --with-picolibc. * configure: Regenerate. * configure.ac: Add handling for with_picolibc=yes. * config/os/picolibc/ctype_base.h: New file. * config/os/picolibc/ctype_configure_char.cc: New file. * config/os/picolibc/ctype_inline.h: New file. * config/os/picolibc/os_defines.h: New file. 2026-01-08 Tomasz Kamiński * testsuite/20_util/variant/constinit.cc: Use scan-tree-dump for matching of constructor. * testsuite/20_util/variant/constinit_compat.cc: Likewise. * testsuite/lib/libstdc++.exp: Load scantree.exp and scandump.exp. 2026-01-07 Jonathan Wakely PR libstdc++/123100 * include/std/sstream (basic_stringbuf::str()&&): Handle the case where _M_string is not being used for the buffer. * testsuite/27_io/basic_stringbuf/str/char/123100.cc: New test. 2026-01-07 Jonathan Wakely * include/bits/atomic_wait.h (__wait_args::_M_setup_wait): Remove unreachable return statement. 2026-01-07 Jonathan Wakely PR libstdc++/123406 * acinclude.m4 (GLIBCXX_CHECK_STDIO_LOCKING): Override detection of flockfile for non-cygwin newlib targets. * configure: Regenerate. 2026-01-07 Jonathan Wakely PR libstdc++/123378 * include/std/barrier (~__tree_barrier_base): Define. 2026-01-07 Jakub Jelinek PR libstdc++/123183 PR libstdc++/123326 * libsupc++/exception (std::bad_exception::~bad_exception(), std::bad_exception::what()): Add inline keyword and [[__gnu__::__gnu_inline__]] attribute to the C++26 constexpr exceptions definitions. * libsupc++/exception.h (std::exception::~exception(), std::exception::what()): Likewise. * libsupc++/exception_ptr.h (std::exception_ptr::exception_ptr(void*)): Likewise. * libsupc++/nested_exception.h (std::nested_exception::~nested_exception()): Likewise. * libsupc++/typeinfo (std::bad_cast::~bad_cast(), std::bad_cast::what(), std::bad_typeid::~bad_typeid(), std::bad_typeid::what()): Likewise. * include/bits/new_except.h (std::bad_alloc::~bad_alloc(), std::bad_alloc::what(), std::bad_array_new_length::~bad_array_new_length(), std::bad_array_new_length::what()): Likewise. * include/bits/stdexcept_except.h (std::logic_error::logic_error(const string&), std::logic_error::logic_error(const char*), std::logic_error::~logic_error(), std::logic_error::what(), std::domain_error::domain_error(const string&), std::domain_error::domain_error(const char*), std::invalid_argument::invalid_argument(const string&), std::invalid_argument::invalid_argument(const char*), std::length_error::length_error(const string&), std::length_error::length_error(const char*), std::out_of_range::out_of_range(const string&), std::out_of_range::out_of_range(const char*), std::runtime_error::runtime_error(const string&), std::runtime_error::runtime_error(const char*), std::runtime_error::~runtime_error(), std::runtime_error::what(), std::overflow_error::overflow_error(const string&), std::overflow_error::overflow_error(const char*), std::overflow_error::~overflow_error(), std::underflow_error::underflow_error(const string&), std::underflow_error::underflow_error(const char*), std::underflow_error::~underflow_error()): Likewise. (std::domain_error::~domain_error(), std::invalid_argument::~invalid_argument(), std::length_error::~length_error(), std::out_of_range::~out_of_range()): Likewise. Also change _GLIBCXX_NOTHROW to noexcept on those definitions. Copyright (C) 2026 Free Software Foundation, Inc. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.