gcc/testsuite/gcc.dg/pointer-arith-2.c

   1 /* Test diagnostics for arithmetic on void and function pointers.
   2    Test with -Wpointer-arith.  */
   3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-Wpointer-arith" } */
   6
   7 void *p;
   8 void (*f)(void);
   9
  10 void
  11 g (void)
  12 {
  13   p + 0; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  14   p + 1; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  15   0 + p; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  16   1 + p; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  17   p - 0; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  18   p - 1; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  19   p += 0; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  20   p += 1; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  21   p -= 0; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  22   p -= 1; /* { dg-warning "pointer of type 'void \\*' used in arithmetic" } */
  23   f + 0; /* { dg-warning "pointer to a function used in arithmetic" } */
  24   f + 1; /* { dg-warning "pointer to a function used in arithmetic" } */
  25   0 + f; /* { dg-warning "pointer to a function used in arithmetic" } */
  26   1 + f; /* { dg-warning "pointer to a function used in arithmetic" } */
  27   f - 0; /* { dg-warning "pointer to a function used in arithmetic" } */
  28   f - 1; /* { dg-warning "pointer to a function used in arithmetic" } */
  29   f += 0; /* { dg-warning "pointer to a function used in arithmetic" } */
  30   f += 1; /* { dg-warning "pointer to a function used in arithmetic" } */
  31   f -= 0; /* { dg-warning "pointer to a function used in arithmetic" } */
  32   f -= 1; /* { dg-warning "pointer to a function used in arithmetic" } */
  33   p[0]; /* { dg-warning "dereferencing 'void \\*' pointer" } */
  34   /* { dg-warning "pointer of type 'void \\*' used in arithmetic" "array 1" { target *-*-* } 33 } */
  35   0[p]; /* { dg-warning "dereferencing 'void \\*' pointer" } */
  36   /* { dg-warning "pointer of type 'void \\*' used in arithmetic" "array 1" { target *-*-* } 35 } */
  37   f[0]; /* { dg-error "subscripted value is pointer to function" } */
  38   0[f]; /* { dg-error "subscripted value is pointer to function" } */
  39   p - p; /* { dg-warning "pointer of type 'void \\*' used in subtraction" } */
  40   f - f; /* { dg-warning "pointer to a function used in subtraction" } */
  41 }