gcc/testsuite/c-c++-common/Waddress-2.c

   1 /* PR c/47931 - missing -Waddress warning for comparison with NULL
   2   { dg-do compile }
   3   { dg-options "-Waddress" } */
   4
   5 #define NULL ((void *) 0)
   6
   7 int i;
   8
   9 int f0 (void)
  10 {
  11   return &i != 0;   /* { dg-warning "the address of .i. will never be NULL" } */
  12 }
  13
  14 int f1 (void)
  15 {
  16   return &i != (void *) 0;   /* { dg-warning "the address of .i. will never be NULL" } */
  17 }
  18
  19 int f2 (void)
  20 {
  21   return &i != NULL;   /* { dg-warning "the address of .i. will never be NULL" } */
  22 }