gcc/testsuite/gcc.dg/pr41935.c

   1 /* PR middle-end/41935 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 extern void abort (void);
   6 struct A { int a; int b[10]; };
   7
   8 int
   9 foo (struct A *p)
  10 {
  11   return __builtin_offsetof (struct A, b[p->a]);
  12 }
  13
  14 int
  15 main ()
  16 {
  17   struct A a;
  18   a.a = 7;
  19   if (foo (&a) != 7 * sizeof (int) + __builtin_offsetof (struct A, b))
  20     abort ();
  21   a.a = 2;
  22   if (foo (&a) != 2 * sizeof (int) + __builtin_offsetof (struct A, b))
  23     abort ();
  24   return 0;
  25 }