gcc/testsuite/gcc.dg/pr25801.c

   1 /* PR c/25801 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c99" } */
   4
   5 int (*a)[];
   6 struct S *s;
   7 union U *u;
   8 enum E *e;
   9
  10 void
  11 f (void)
  12 {
  13   a++; /* { dg-error "increment of pointer to an incomplete type" } */
  14   ++a; /* { dg-error "increment of pointer to an incomplete type" } */
  15   a--; /* { dg-error "decrement of pointer to an incomplete type" } */
  16   --a; /* { dg-error "decrement of pointer to an incomplete type" } */
  17   a += 1; /* { dg-error "invalid use of array with unspecified bounds" } */
  18   a -= 1; /* { dg-error "invalid use of array with unspecified bounds" } */
  19   a - a; /* { dg-error "arithmetic on pointer to an incomplete type" } */
  20
  21   s++; /* { dg-error "increment of pointer to an incomplete type" } */
  22   ++s; /* { dg-error "increment of pointer to an incomplete type" } */
  23   s--; /* { dg-error "decrement of pointer to an incomplete type" } */
  24   --s; /* { dg-error "decrement of pointer to an incomplete type" } */
  25   s += 1; /* { dg-error "invalid use of undefined type" } */
  26   s -= 1; /* { dg-error "invalid use of undefined type" } */
  27   s - s; /* { dg-error "arithmetic on pointer to an incomplete type" } */
  28
  29   u++; /* { dg-error "increment of pointer to an incomplete type" } */
  30   ++u; /* { dg-error "increment of pointer to an incomplete type" } */
  31   u--; /* { dg-error "decrement of pointer to an incomplete type" } */
  32   --u; /* { dg-error "decrement of pointer to an incomplete type" } */
  33   u += 1; /* { dg-error "invalid use of undefined type" } */
  34   u -= 1; /* { dg-error "invalid use of undefined type" } */
  35   u - u; /* { dg-error "arithmetic on pointer to an incomplete type" } */
  36
  37   e++; /* { dg-error "increment of pointer to an incomplete type" } */
  38   ++e; /* { dg-error "increment of pointer to an incomplete type" } */
  39   e--; /* { dg-error "decrement of pointer to an incomplete type" } */
  40   --e; /* { dg-error "decrement of pointer to an incomplete type" } */
  41   e += 1; /* { dg-error "invalid use of undefined type" } */
  42   e -= 1; /* { dg-error "invalid use of undefined type" } */
  43   e - e; /* { dg-error "arithmetic on pointer to an incomplete type" } */
  44 }