gcc/testsuite/c-c++-common/builtin-offsetof.c

   1 // Contributed by Dodji Seketeli <dodji@redhat.com>
   2 // Origin PR c++/38699
   3 // { dg-options "-Warray-bounds" }
   4 // { dg-do compile }
   5
   6 struct A
   7 {
   8   const char *p;
   9 };
  10
  11 struct B
  12 {
  13     char p[10];
  14     struct A a;
  15 };
  16
  17 void
  18 f0 ()
  19 {
  20   __builtin_offsetof(struct A, p); // OK
  21   __builtin_offsetof(struct A, p[0]); // { dg-error "non constant address" }
  22   __builtin_offsetof(struct B, p[0]); // OK
  23   __builtin_offsetof(struct B, p[9]); // OK
  24   __builtin_offsetof(struct B, p[10]); // OK
  25   __builtin_offsetof(struct B, p[11]); // { dg-warning "greater than size" }
  26   __builtin_offsetof(struct B, a.p); // OK
  27   __builtin_offsetof(struct B, p[0]); // OK
  28   __builtin_offsetof(struct B, a.p[0]); // { dg-error "non constant address" }
  29 }