gcc/testsuite/gcc.dg/pr39343.c

   1 /* PR tree-optimization/39343 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 extern void abort (void);
   6
   7 extern inline __attribute__ ((__always_inline__)) int
   8 foo (char *dest)
   9 {
  10   return __builtin_object_size (dest, 1);
  11 }
  12
  13 struct S
  14 {
  15   union
  16   {
  17     struct { int a, b; char c, d; } f;
  18     struct { struct { int a, b; char c, d[255]; } e; } g;
  19   } u;
  20 };
  21
  22 int
  23 main (void)
  24 {
  25   struct S s;
  26   if (foo (s.u.g.e.d) != 255)
  27     abort ();
  28   return 0;
  29 }