1  /* { dg-options "-std=iso9899:1990 -pedantic" } */
       2  /* In strict ISO C mode, we don't recognize the anonymous struct/union
       3     extension or any 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; };		/* { dg-warning "unnamed structs" } */
      25    char e;
      26  };
      27  
      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  /* __extension__ enables GNU C mode for the duration of the declaration.  */
      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    __extension__ struct { char z; };
      46    char h;
      47  };
      48  char testH[sizeof(struct H) == 2 * sizeof(struct A) ? 1 : -1];
      49  
      50  /* Make sure __extension__ gets turned back off.  */
      51  struct I {
      52    struct { char z; };		/* { dg-warning "unnamed structs" } */
      53    char i;
      54  };
      55  char testI[sizeof(struct I) == sizeof(struct E) ? 1 : -1];
      56