gcc/testsuite/gcc.dg/builtin-object-size-12.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 extern void abort (void);
   5 struct S {
   6     int len;
   7     char s[0];
   8 };
   9 int main()
  10 {
  11   char buf[sizeof (struct S) + 32];
  12   if (__builtin_object_size (((struct S *)&buf[0])->s, 1) != 32)
  13     abort ();
  14   if (__builtin_object_size (((struct S *)&buf[1])->s, 1) != 31)
  15     abort ();
  16   if (__builtin_object_size (((struct S *)&buf[64])->s, 0) != 0)
  17     abort ();
  18   return 0;
  19 }