We should use the second argument of AC_TRY_LINK.
Otherwise, the main function defined twice and this test does never succeed.
git-svn-id: https://google-glog.googlecode.com/svn/trunk@102
eb4d4688-79bd-11dd-afb4-
1d65580434c0
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
-int main() { int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0; }
+
int
main ()
{
-
+int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0;
;
return 0;
}
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
)])