37 lines
1.4 KiB
Plaintext
37 lines
1.4 KiB
Plaintext
# AC_C___ATOMIC
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# -------------
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# Define HAVE_C___ATOMIC if __atomic works.
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AN_IDENTIFIER([__atomic], [AC_C___ATOMIC])
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AC_DEFUN([AC_C___ATOMIC],
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[AC_CACHE_CHECK([for __atomic], ac_cv_c___atomic,
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[AC_LINK_IFELSE(
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[AC_LANG_SOURCE(
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[[int
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main (int argc, char **argv)
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{
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volatile unsigned long ul1 = 1, ul2 = 0, ul3 = 2;
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__atomic_load_n(&ul1, __ATOMIC_SEQ_CST);
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__atomic_compare_exchange(&ul1, &ul2, &ul3, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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__atomic_fetch_add(&ul1, 1, __ATOMIC_SEQ_CST);
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__atomic_fetch_sub(&ul3, 1, __ATOMIC_SEQ_CST);
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__atomic_or_fetch(&ul1, ul2, __ATOMIC_SEQ_CST);
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__atomic_and_fetch(&ul1, ul2, __ATOMIC_SEQ_CST);
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volatile unsigned long long ull1 = 1, ull2 = 0, ull3 = 2;
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__atomic_load_n(&ull1, __ATOMIC_SEQ_CST);
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__atomic_compare_exchange(&ull1, &ull2, &ull3, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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__atomic_fetch_add(&ull1, 1, __ATOMIC_SEQ_CST);
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__atomic_fetch_sub(&ull3, 1, __ATOMIC_SEQ_CST);
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__atomic_or_fetch(&ull1, ull2, __ATOMIC_SEQ_CST);
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__atomic_and_fetch(&ull1, ull2, __ATOMIC_SEQ_CST);
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return 0;
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}
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]])],
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[ac_cv_c___atomic=yes],
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[ac_cv_c___atomic=no])])
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if test $ac_cv_c___atomic = yes; then
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AC_DEFINE([HAVE_C___ATOMIC], 1,
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[Define to 1 if __atomic operations work.])
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AM_CFLAGS="$AM_CFLAGS -DHAVE_C___ATOMIC=1"
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fi
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])# AC_C___ATOMIC
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