gcc/testsuite/c-c++-common/nonnull-3.c

   1 /* PR c++/79984 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wnonnull-compare" } */
   4
   5 enum { r = 1 };
   6
   7 __attribute__ ((nonnull (r))) int
   8 f (int *p)
   9 {
  10   return p == 0; /* { dg-warning "nonnull argument 'p' compared to NULL" } */
  11 }