gcc/testsuite/gcc.c-torture/execute/pr43784.c

   1 struct s {
   2   unsigned char a[256];
   3 };
   4 union u {
   5   struct { struct s b; int c; } d;
   6   struct { int c; struct s b; } e;
   7 };
   8
   9 static union u v;
  10 static struct s *p = &v.d.b;
  11 static struct s *q = &v.e.b;
  12
  13 static struct s __attribute__((noinline)) rp(void)
  14 {
  15   return *p;
  16 }
  17
  18 static void qp(void)
  19 {
  20   *q = rp();
  21 }
  22
  23 int main()
  24 {
  25   int i;
  26   for (i = 0; i < 256; i++)
  27     p->a[i] = i;
  28   qp();
  29   for (i = 0; i < 256; i++)
  30     if (q->a[i] != i)
  31       __builtin_abort();
  32   return 0;
  33 }