gcc/testsuite/gcc.dg/pointer-arith-1.c

   1 /* Test diagnostics for arithmetic on void and function pointers.
   2    Test with no special options.  */
   3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   4 /* { dg-do compile } */
   5 /* { dg-options "" } */
   6
   7 void *p;
   8 void (*f)(void);
   9
  10 void
  11 g (void)
  12 {
  13   p + 0;
  14   p + 1;
  15   0 + p;
  16   1 + p;
  17   p - 0;
  18   p - 1;
  19   p += 0;
  20   p += 1;
  21   p -= 0;
  22   p -= 1;
  23   f + 0;
  24   f + 1;
  25   0 + f;
  26   1 + f;
  27   f - 0;
  28   f - 1;
  29   f += 0;
  30   f += 1;
  31   f -= 0;
  32   f -= 1;
  33   p[0]; /* { dg-warning "dereferencing 'void \\*' pointer" } */
  34   0[p]; /* { dg-warning "dereferencing 'void \\*' pointer" } */
  35   f[0]; /* { dg-error "subscripted value is pointer to function" } */
  36   0[f]; /* { dg-error "subscripted value is pointer to function" } */
  37   p - p;
  38   f - f;
  39 }