gcc/testsuite/gcc.c-torture/execute/pr41395-2.c

   1 struct VEC_char_base
   2 {
   3   unsigned num;
   4   unsigned alloc;
   5   union {
   6       short vec[1];
   7       struct {
   8           int i;
   9           int j;
  10           int k;
  11       } a;
  12   } u;
  13 };
  14
  15 short __attribute__((noinline))
  16 foo (struct VEC_char_base *p, int i)
  17 {
  18   short *q;
  19   p->u.vec[i] = 0;
  20   q = &p->u.vec[16];
  21   *q = 1;
  22   return p->u.vec[i];
  23 }
  24
  25 extern void abort (void);
  26 extern void *malloc (__SIZE_TYPE__);
  27
  28 int
  29 main()
  30 {
  31   struct VEC_char_base *p = malloc (sizeof (struct VEC_char_base) + 256);
  32   if (foo (p, 16) != 1)
  33     abort ();
  34   return 0;
  35 }