Switch to obtain "narrowing" warnings

[Segher Boessenkool]

>> > 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.

> 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;
> }

It does just that, with *newer* versions of GCC -- 4.2.0 doesn't
yet do this, you need an unreleased version right now.


Segher