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The __gthread_yield() function is only defined for gthreads targets, so check _GLIBCXX_HAS_GTHREADS before using it. Also reorder __thread_relax and __thread_yield so that the former can use the latter instead of repeating the same preprocessor checks. libstdc++-v3/ChangeLog: * include/bits/atomic_wait.h (__thread_yield()): Check _GLIBCXX_HAS_GTHREADS before using __gthread_yield. (__thread_relax()): Use __thread_yield() instead of repeating the preprocessor checks for __gthread_yield.
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