gcc/testsuite/gcc.dg/alias-2.c

   1 // { dg-do compile }
   2 // { dg-options "-Wstrict-aliasing=2 -fstrict-aliasing" }
   3
   4 struct foo {
   5   char c;
   6   char d;
   7   short s;
   8   int i;
   9 } bar;
  10
  11 int
  12 sub1 (long long int foobar)
  13 {
  14   struct foo *tmp = (struct foo *) &foobar; // { dg-warning "type-punned pointer will" }
  15   return tmp->i;
  16 }