AC_MSG_CHECKING(for __sync_val_compare_and_swap)
AC_CACHE_VAL(ac_cv___sync_val_compare_and_swap, [
AC_TRY_LINK(
- [int main() { int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0; }],
[],
+ [int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0;],
ac_cv___sync_val_compare_and_swap=yes,
ac_cv___sync_val_compare_and_swap=no
)])