Switch to obtain "narrowing" warnings

[j t]

On 05 Jun 2007 09:59:36 -0700, Ian Lance Taylor <iant@google.com> wrote:
> "j t" <mark473@gmail.com> writes:
>
> > Excuse my newbieness, but is there a gcc switch that enables warnings
> > from implicit narrowing (int -> short, for example), or is this best
> > obtained from other software such as lint/splint?
>
> -Wconversion does this, in newer versions of gcc.
>
> Ian
>

Interesting. It could well be my mistake, but shouldn't "gcc
-Wconversion test.c" throw at least some unhappiness with:

#include <stdio.h>
int main(void){
  int i=99999;
  short s;
  s=i;
  printf("s is %d\n", s);
  return 0;
}

I get no output (success) from "gcc -Wconversion test.c", while
"splint test.c" gives:

test.c:5:3: Assignment of int to short int: s = i
  To ignore type qualifiers in type comparisons use +ignorequals.

(I'd prefer to not use splint, as I don't think it supports c99 yet).