920413-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* { dg-do compile } */
/* { dg-options "-Wtraditional" } */

int
x (b)
{
  return
  4294967295U   /* { dg-warning "width of integer|traditional C rejects" } */
   / (unsigned long) b;
}