gcc/testsuite/gcc.dg/transparent-union-5.c

   1 /* PR 24255 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O" } */
   4
   5 extern void abort (void);
   6
   7 union wait { int w_status; };
   8
   9 typedef union
  10 {
  11   union wait *uptr;
  12   int *iptr;
  13 } WAIT_STATUS __attribute__ ((__transparent_union__));
  14
  15 int status;
  16 union wait wstatus;
  17
  18 void __attribute__((noinline))
  19 test1 (WAIT_STATUS s)
  20 {
  21   if (s.iptr != &status)
  22     abort ();
  23 }
  24
  25 void __attribute__((noinline))
  26 test2 (WAIT_STATUS s)
  27 {
  28   if (s.uptr != &wstatus)
  29     abort ();
  30 }
  31
  32 int main()
  33 {
  34   test1 (&status);
  35   test2 (&wstatus);
  36   return 0;
  37 }