gcc/testsuite/c-c++-common/pr41935.c

   1 /* { dg-options "-Warray-bounds" } */
   2 /* { dg-do compile } */
   3
   4 struct A
   5 {
   6   int i;
   7   char p[1];
   8 };
   9
  10 struct B
  11 {
  12   struct A a;
  13   int i;
  14 };
  15
  16 struct C
  17 {
  18   int i;
  19   struct A a;
  20 };
  21
  22 union D
  23 {
  24   char p[1];
  25   struct A a;
  26   struct B b;
  27   struct C c;
  28 };
  29
  30 struct E
  31 {
  32   int i;
  33   union D d;
  34 };
  35
  36 struct F
  37 {
  38   union D d;
  39   int i;
  40 };
  41
  42 union G
  43 {
  44   int i;
  45   union D d;
  46 };
  47
  48 void
  49 f0 ()
  50 {
  51   __builtin_offsetof (struct A, p[4]); /* OK */
  52   __builtin_offsetof (struct B, a.p[4]); /* { dg-warning "greater than size" } */
  53   __builtin_offsetof (struct C, a.p[4]); /* OK */
  54   __builtin_offsetof (union D, p[4]); /* OK */
  55   __builtin_offsetof (union D, a.p[4]); /* OK */
  56   __builtin_offsetof (union D, b.a.p[4]); /* { dg-warning "greater than size" } */
  57   __builtin_offsetof (union D, c.a.p[4]); /* OK */
  58   __builtin_offsetof (struct E, d.p[4]); /* OK */
  59   __builtin_offsetof (struct E, d.a.p[4]); /* OK */
  60   __builtin_offsetof (struct E, d.b.a.p[4]); /* { dg-warning "greater than size" } */
  61   __builtin_offsetof (struct E, d.c.a.p[4]); /* OK */
  62   __builtin_offsetof (struct F, d.p[4]); /* { dg-warning "greater than size" } */
  63   __builtin_offsetof (struct F, d.a.p[4]); /* { dg-warning "greater than size" } */
  64   __builtin_offsetof (struct F, d.b.a.p[4]); /* { dg-warning "greater than size" } */
  65   __builtin_offsetof (struct F, d.c.a.p[4]); /* { dg-warning "greater than size" } */
  66   __builtin_offsetof (union G, d.p[4]); /* OK */
  67   __builtin_offsetof (union G, d.a.p[4]); /* OK */
  68   __builtin_offsetof (union G, d.b.a.p[4]); /* { dg-warning "greater than size" } */
  69   __builtin_offsetof (union G, d.c.a.p[4]); /* OK */
  70 }