https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122698
--- Comment #1 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <[email protected]>: https://gcc.gnu.org/g:84dbb22f32a525a0f0e0b7c02c56eec2fa6f39da commit r16-5319-g84dbb22f32a525a0f0e0b7c02c56eec2fa6f39da Author: Jonathan Wakely <[email protected]> Date: Sun Nov 16 13:57:25 2025 +0000 libstdc++: Include <mutex> in syncbuf.cc [PR122698] For most configurations bits/std_mutex.h would already be included by <syncstream>, but not if configured with _GLIBCXX_USE_CXX11_ABI=0 as the default, because syncbuf is disabled in that case. libstdc++-v3/ChangeLog: PR libstdc++/122698 * src/c++20/syncbuf.cc (__syncbuf_get_mutex): Include <mutex>. Fix indentation of function body.
