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This fixes an invalid narrowing conversion that causes problems when libstdc++ is used with clang++ on non-pthreads targets. PR libstdc++/53578 * include/ext/concurrence.h (__recursive_mutex::_S_destroy): Fix narrowing conversion. * include/std/mutex (__recursive_mutex_base::_S_destroy): Likewise. Tested x86_64-linux with _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC defined so the code is executed. Committed to trunk.
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