gcc/testsuite/gcc.dg/pr32207.c

   1 /* Test warning for comparison non-null address with null pointer constant. */
   2 /* Origin: Pawel Sikora <pluto@agmk.net> */
   3 /* { dg-do compile } */
   4 /* { dg-options "-Waddress" } */
   5 extern void z();
   6
   7 void f() { if ( z ) z(); } /* { dg-warning "always evaluate as" } */
   8 void g() { if ( z != 0 ) z(); } /* { dg-warning "the comparison will always evaluate as 'true'" } */
   9 void h() { if ( z != (void*)0 ) z(); } /* { dg-warning "the comparison will always evaluate as 'true'" } */