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FreeBSD 11 adds __cxa_thread_atexit to libc, so we should use that instead of defining our own inferior version. This also avoids multiple definitions of the symbol. PR libstdc++/78968 * config.h.in: Regenerate. * configure: Likewise. * configure.ac: Check for __cxa_thread_atexit. * libsupc++/atexit_thread.cc [_GLIBCXX_HAVE___CXA_THREAD_ATEXIT]: Don't define __cxa_thread_atexit if libc provides it. Tested powerpc64le-linux, committed to trunk.
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