gcc/testsuite/gcc.dg/Wall.c

   1 /* PR 30437: Test -Wall
   2    Don't change this without changing Wno-all.c as well.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-Wall" } */
   5
   6 void foo(int a)
   7 {
   8   5 * (a == 1) | (a == 2);  /* { dg-warning "no effect" "no effect" } */
   9 }