https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124444
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Francois Dumont <[email protected]>: https://gcc.gnu.org/g:a1f1a60fc6490e677d63b637cc268b513749cc5c commit r16-8101-ga1f1a60fc6490e677d63b637cc268b513749cc5c Author: François Dumont <[email protected]> Date: Sat Mar 14 14:34:29 2026 +0100 libstdc++: [_GLIBCXX_DEBUG] _M_invalidate_if incompatible with C++20 [PR124444] __gnu_cxx::__scoped_lock cannot be instantiated in a C++20 constexpr function. Use an intermediate method to avoid this situation. libstdc++-v3/ChangeLog: PR libstdc++/124444 * include/debug/safe_sequence.h (_Safe_sequence::_M_invalidate_if_impl): New. (_Safe_sequence::_M_invalidate_if): Call later if not __is_constant_evaluated. * include/debug/safe_sequence.tcc: Rename _M_invalidate_if into _M_invalidate_if_impl and remove C++20 constexpr. Reviewed-by: Jonathan Wakely <[email protected]>
