gcc/testsuite/gcc.dg/c1x-anon-struct-1.c

   1 /* Test for anonymous structures and unions in C1X.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c1x -pedantic-errors" } */
   4
   5 #include <stddef.h>
   6
   7 struct s1
   8 {
   9   int a;
  10   union
  11   {
  12     int i;
  13   };
  14   struct
  15   {
  16     int b;
  17   };
  18 };
  19
  20 union u1
  21 {
  22   int b;
  23   struct
  24   {
  25     int i;
  26   };
  27   union
  28   {
  29     int c;
  30   };
  31 };
  32
  33 struct s2
  34 {
  35   struct
  36   {
  37     int a;
  38   };
  39 };
  40
  41 struct s3
  42 {
  43   union
  44   {
  45     int i;
  46   };
  47 };
  48
  49 struct s4
  50 {
  51   struct
  52   {
  53     int i;
  54   };
  55   int a[];
  56 };
  57
  58 struct s1 x =
  59   {
  60     .b = 1,
  61     .i = 2,
  62     .a = 3
  63   };
  64
  65 int o = offsetof (struct s1, i);
  66
  67 void
  68 f (void)
  69 {
  70   x.i = 3;
  71   (&x)->i = 4;
  72 }