libstdc++-v3/ChangeLog

2026-01-07  Jonathan Wakely  <jwakely@redhat.com>

	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  <jwakely@redhat.com>

	* include/bits/atomic_wait.h (__wait_args::_M_setup_wait):
	Remove unreachable return statement.

2026-01-07  Jonathan Wakely  <jwakely@redhat.com>

	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  <jwakely@redhat.com>

	PR libstdc++/123378
	* include/std/barrier (~__tree_barrier_base): Define.

2026-01-07  Jakub Jelinek  <jakub@redhat.com>

	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.


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