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Re: size_t printf warnings and preprocessor
Marc Espie <espie@schutzenberger.liafa.jussieu.fr> writes:
> On Thu, Jul 12, 2001 at 05:48:52PM +0200, Andreas Jaeger wrote:
>> Marc Espie <espie@quatramaran.ens.fr> writes:
>>
>> > I would love to get size_t warnings for printf out of gcc.
>> > I've already noticed that 3.0 is much better at following typeinfo than
>> > 2.95 used to.
>> >
>> > I would like to have a switch such that
>> > size_t var;
>> > printf(format, var);
>> >
>> > invariably ends in an error, as there can't be a single format that works
>> > with size_t.
>>
>> "%z" is specified by ISO C 99 for size_t. So what's wrong with printf
>> ("%z\n", var) ?
>>
>> Sorry, I'm lost with your proposal.
>
> Nothing is wrong, I don't have the C99 proposal with me... :)
>
> Okay, what I'm proposing still makes sense in the legacy case, for people
> who have written code before %z and who would like it checked.
>
> Also, in pedantic C99 mode, do we warn when size_t is used without %z ?
Now I get it - you do it the other way round. You want to allow
size_t only with %z and forbid e.g. "%ld", var or even "%ld",(long)var.
Andreas
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
http://www.suse.de/~aj