gcc/testsuite/gcc.dg/ordered-comparison-4.c

   1 /* Test warning for ordered comparison pointer with null pointer constant. */
   2 /* Test with -Wextra. */
   3 /* { dg-do compile } */
   4 /* { dg-options "-Wextra" } */
   5 extern void z();
   6 void *p;
   7
   8 void f() {
   9  if (z >= 0) /* { dg-warning "ordered comparison of pointer with" } */
  10    z();
  11  if (0 >= z) /* { dg-warning "ordered comparison of pointer with" } */
  12     z();
  13  if (p >= (void*)0) /* { dg-warning "ordered comparison of pointer with null pointer" } */
  14     z();
  15  if ((void*)0 >= p) /* { dg-warning "ordered comparison of pointer with null pointer" } */
  16     z();
  17  if (z >= (void*)0) /* { dg-warning "distinct pointer types lacks a cast" } */
  18     z();
  19  if ((void*)0 >=z) /* { dg-warning "distinct pointer types lacks a cast" } */
  20     z();
  21 }