I'll try the -Wconversion flag once more. May be i rushed through my test the first time.
thanks
--- On Mon, 9/20/10, John Graham <johngavingraham@xxxxxxxxxxxxxx> wrote:
> From: John Graham <johngavingraham@xxxxxxxxxxxxxx>
> Subject: Re: I'd like to get warnings on loss of data during implicit conversions
> To: "Jeff Saremi" <jeffsaremi@xxxxxxxxx>
> Cc: gcc-help@xxxxxxxxxxx
> Received: Monday, September 20, 2010, 12:06 PM
> -Wconversion should do exactly what
> you want - at least it does for me
> in this example:
>
> ---
>
> #include <stdint.h>
> int main(void)
> {
> Â Â int32_t l;
> Â Â int16_t s = l;
> }
>
> ---
>
> $ gcc test.c
> $ gcc test.c -Wconversion
> test.c: In function âmainâ:
> test.c:6: warning: conversion to âint16_tâ from
> âint32_tâ may alter its value
> $
>
> ---
>
> If it doesn't work for you, are you sure that the
> conversion you're
> expecting to produce a warning is *really* a narrowing
> conversion?
>
> John G
>
>
>
> On Mon, Sep 20, 2010 at 4:15 PM, Jeff Saremi <jeffsaremi@xxxxxxxxx>
> wrote:
> > When i compile my c or C++ code under Microsoft
> compiler I get warnings like the following:
> > warning C4244: 'argument' : conversion from 'unsigned
> long' to 'uint16
> > ', possible loss of data
> >
> > However, compiling the same code with Gcc/G++ does not
> produce this warning at all?
> >
> > My question is:
> > - is this a standard (i mean ISO) warning? or is it a
> courtesy warning?
> > - Does gcc have something similar to this? If so which
> option is that?
> >
> > I have tried the following individiaully and in
> combination to no avail:
> >
> > -Wall, -Wextra, -Wconversion
> > thanks
> > jeff
> >
> >
>
