gcc/testsuite/gcc.c-torture/execute/pr34456.c

   1 #include <stdlib.h>
   2
   3 int __attribute__ ((noinline)) debug (void) { return 1; }
   4 int errors;
   5
   6 struct s { int elt; int (*compare) (int); };
   7
   8 static int
   9 compare (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
  22 int bad_compare (int x) { return -x; }
  23 struct s array[2] = { { 1, bad_compare }, { -1, bad_compare } };
  24
  25 int
  26 main (void)
  27 {
  28   qsort (array, 2, sizeof (struct s), compare);
  29   return errors == 0;
  30 }