| AC_DEFUN([AX_C___SYNC_VAL_COMPARE_AND_SWAP], [ |
| AC_MSG_CHECKING(for __sync_val_compare_and_swap) |
| AC_CACHE_VAL(ac_cv___sync_val_compare_and_swap, [ |
| AC_TRY_LINK( |
| [], |
| [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 |
| )]) |
| if test "$ac_cv___sync_val_compare_and_swap" = "yes"; then |
| AC_DEFINE(HAVE___SYNC_VAL_COMPARE_AND_SWAP, 1, [define if your compiler has __sync_val_compare_and_swap]) |
| fi |
| AC_MSG_RESULT($ac_cv___sync_val_compare_and_swap) |
| ]) |