gcc/testsuite/gcc.c-torture/execute/pr84339.c

   1 /* PR tree-optimization/84339 */
   2
   3 struct S { int a; char b[1]; };
   4
   5 __attribute__((noipa)) int
   6 foo (struct S *p)
   7 {
   8   return __builtin_strlen (&p->b[0]);
   9 }
  10
  11 __attribute__((noipa)) int
  12 bar (struct S *p)
  13 {
  14   return __builtin_strlen (p->b);
  15 }
  16
  17 int
  18 main ()
  19 {
  20   struct S *p = __builtin_malloc (sizeof (struct S) + 16);
  21   if (p)
  22     {
  23       p->a = 1;
  24       __builtin_strcpy (p->b, "abcdefg");
  25       if (foo (p) != 7 || bar (p) != 7)
  26         __builtin_abort ();
  27       __builtin_free (p);
  28     }
  29   return 0;
  30 }