1#include <stdlib.h>
2
3int __attribute__ ((noinline)) debug (void) { return 1; }
4int errors;
5
6struct s { int elt; int (*compare) (int); };
7
8static int
9compare (const void *x, const void *y)
10{
11  const struct s *s1 = x, *s2 = y;
12  int (*compare1) (int);
13  int elt2;
14
15  compare1 = s1->compare;
16  elt2 = s2->elt;
17  if (elt2 != 0 && debug () && compare1 (s1->elt) != 0)
18    errors++;
19  return compare1 (elt2);
20}
21
22int bad_compare (int x) { return -x; }
23struct s array[2] = { { 1, bad_compare }, { -1, bad_compare } };
24
25int
26main (void)
27{
28  qsort (array, 2, sizeof (struct s), compare);
29  return errors == 0;
30}
31