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clang complains about alignments on 64bit atomics and falls back to using these functions from libatomic. And the configure part does not detect this condition and thinks that system can support 64bit atomics just fine. clang needs this patch to fix | pfs_instr.cc:(.text+0x10a5): undefined reference to `__atomic_fetch_add_8' Signed-off-by: Khem Raj <raj.khem@gmail.com> Cc: Mingli Yu <mingli.yu@windriver.com>