gcc/testsuite/gcc.dg/builtin-object-size-14.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 extern void abort (void);
   5 extern char *strncpy(char *, const char *, __SIZE_TYPE__);
   6
   7 union u {
   8     struct {
   9         char vi[8];
  10         char pi[16];
  11     };
  12     char all[8+16+4];
  13 };
  14
  15 void __attribute__((noinline,noclone))
  16 f(union u *u)
  17 {
  18   char vi[8+1];
  19   __builtin_strncpy(vi, u->vi, sizeof(u->vi));
  20   if (__builtin_object_size (u->all, 1) != -1)
  21     abort ();
  22 }
  23 int main()
  24 {
  25   union u u;
  26   f (&u);
  27   return 0;
  28 }