gcc/testsuite/gcc.dg/Wstrict-aliasing-bogus-upcast.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -Wall" } */
   3
   4 struct a {
   5     int i;
   6 };
   7 struct b {
   8     struct a a;
   9     int j;
  10 };
  11 int main(void)
  12 {
  13   static struct b b;
  14   struct a *ap=(struct a *)&b;
  15   return ((struct b *)&ap->i)->j; /* { dg-bogus "will break strict-aliasing" } */
  16 }
  17