CHECK_C_SOURCE_RUNS(
         "int main() {
          volatile int foo= -10; 
          volatile int bar= 10;
          /* operation returns 0 and foo should be 0 */
          if (!__sync_fetch_and_add(&foo, bar) || foo)
            return -1;
          bar= __sync_lock_test_and_set(&foo, bar);
          /* Now bar is the return value 0 and foo is set to 10 */
          if (bar || foo != 10)
            return -1;
          __sync_val_compare_and_swap(&bar, foo, 15);
          /* CAS should have failed and bar is still 0 */
          if (bar)
            return -1;
          return 0;
        }"
        HAVE_GCC_ATOMICS_WITH_ARCH_FLAG
      )