commit 9cd656c68b43e5ae041e1d6cafd194fc359b7b58
author Jonathan Wakely <jwakely@redhat.com> Tue Aug 19 18:02:53 2025 +0100
committer Jonathan Wakely <redi@gcc.gnu.org> Sun Aug 31 10:19:22 2025 +0100
tree b530aaad9cfda2b12186a6cf929c2fde2418c974
parent 5d3d024b1e9e7ac0d8e05c0ff016b24f306b9ad5

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 Kamiński <tkaminsk@redhat.com>
(cherry picked from commit d1dec304453fa4874d16daaa15e6f477435edda4)