1 extern void abort ();
2 
f(int x)3 int f(int x)
4 {
5   return (x >> (sizeof (x) * __CHAR_BIT__ - 1)) ? -1 : 1;
6 }
7 
8 volatile int one = 1;
main(void)9 int main (void)
10 {
11   /* Test that the function above returns different values for
12      different signs.  */
13   if (f(one) == f(-one))
14     abort ();
15   return 0;
16 }
17 
18