gcc/testsuite/gcc.c-torture/execute/20001228-1.c

   1 int foo1(void)
   2 {
   3   union {
   4     char a[sizeof (unsigned)];
   5     unsigned b;
   6   } u;
   7
   8   u.b = 0x01;
   9   return u.a[0];
  10 }
  11
  12 int foo2(void)
  13 {
  14   volatile union {
  15     char a[sizeof (unsigned)];
  16     unsigned b;
  17   } u;
  18
  19   u.b = 0x01;
  20   return u.a[0];
  21 }
  22
  23 int main(void)
  24 {
  25   if (foo1() != foo2())
  26     abort ();
  27   exit (0);
  28 }