gcc/testsuite/gcc.dg/ordered-comparison-3.c

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