https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121496
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:d1dec304453fa4874d16daaa15e6f477435edda4 commit r16-3329-gd1dec304453fa4874d16daaa15e6f477435edda4 Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue Aug 19 18:02:53 2025 +0100 libstdc++: Check _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK with #if [PR121496] The change in r14-905-g3b7cb33033fbe6 to disable the use of pthread_mutex_clocklock when TSan is active assumed that the _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK macro was always checked with #if rather than #ifdef, which was not true. This makes the checks use #if consistently. libstdc++-v3/ChangeLog: PR libstdc++/121496 * include/std/mutex (__timed_mutex_impl::_M_try_wait_until): Change preprocessor condition to use #if instead of #ifdef. (recursive_timed_mutex::_M_clocklock): Likewise. * testsuite/30_threads/timed_mutex/121496.cc: New test. Reviewed-by: Tomasz KamiÅski <tkami...@redhat.com>