afe04691ac
git-subtree-dir: third_party/glog git-subtree-split: 9ef754a3023e6fd10f20fe53dfca96dd898182e3
14 lines
583 B
Text
14 lines
583 B
Text
AC_DEFUN([AX_C___SYNC_VAL_COMPARE_AND_SWAP], [
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AC_MSG_CHECKING(for __sync_val_compare_and_swap)
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AC_CACHE_VAL(ac_cv___sync_val_compare_and_swap, [
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AC_TRY_LINK(
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[],
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[int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0;],
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ac_cv___sync_val_compare_and_swap=yes,
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ac_cv___sync_val_compare_and_swap=no
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)])
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if test "$ac_cv___sync_val_compare_and_swap" = "yes"; then
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AC_DEFINE(HAVE___SYNC_VAL_COMPARE_AND_SWAP, 1, [define if your compiler has __sync_val_compare_and_swap])
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fi
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AC_MSG_RESULT($ac_cv___sync_val_compare_and_swap)
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])
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