gcc/testsuite/gcc.dg/anon-struct-2.c

   1 /* { dg-options "-std=gnu89" } */
   2 /* In GNU C mode, we recognize the anonymous struct/union extension,
   3    but not Microsoft extensions.  */
   4
   5 struct A { char a; };
   6
   7 /* MS extension.  */
   8 struct B {
   9   struct A;                     /* { dg-warning "does not declare anything" } */
  10   char b;
  11 };
  12 char testB[sizeof(struct B) == sizeof(struct A) ? 1 : -1];
  13
  14 /* MS extension.  */
  15 struct C {
  16   struct D { char d; };         /* { dg-warning "does not declare anything" } */
  17   char c;
  18 };
  19 char testC[sizeof(struct C) == sizeof(struct A) ? 1 : -1];
  20 char testD[sizeof(struct D) == sizeof(struct A) ? 1 : -1];
  21
  22 /* GNU extension.  */
  23 struct E {
  24   struct { char z; };
  25   char e;
  26 };
  27 char testE[sizeof(struct E) == 2 * sizeof(struct A) ? 1 : -1];
  28
  29 /* MS extension.  */
  30 typedef struct A typedef_A;
  31 struct F {
  32   typedef_A;                    /* { dg-warning "does not declare anything" } */
  33   char f;
  34 };
  35 char testF[sizeof(struct F) == sizeof(struct A) ? 1 : -1];
  36
  37 /* Test that __extension__ does the right thing coming _from_ GNU C mode.  */
  38 __extension__ struct G {
  39   struct { char z; };
  40   char g;
  41 };
  42 char testG[sizeof(struct G) == 2 * sizeof(struct A) ? 1 : -1];
  43
  44 struct H {
  45   struct { char z; };
  46   char h;
  47 };
  48 char testH[sizeof(struct H) == 2 * sizeof(struct A) ? 1 : -1];