[Bug c/60439] New: No warning for case overflow in switch statement.

["chengniansun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60439

            Bug ID: 60439
           Summary: No warning for case overflow in switch statement.
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com

For the switch statement in the function f2, the controlling expression is
either 1 or 0, and the first "case 1111" exceeds the max value. 


$: cat s.c
int f1(char c) {
  switch(c) {
  case 111111: return 1; /*warning here*/
  default: return 0;
  }
}
int f2(char c, char d) {
  switch(c && d) {
  case 1111: return 1; /*no warning here*/
  default: return 0;
  }
}
$: gcc-trunk -c s.c 
s.c: In function âf1â:
s.c:3:3: warning: case label value exceeds maximum value for type
   case 111111: return 1; /*warning here*/
   ^