Re: [Qemu-devel] [PATCH 00/14] gcc extra warning fixes

[Jes Sorensen <Jes.Sorensen@redhat.com>]

On 08/30/10 21:25, Blue Swirl wrote:
> On Mon, Aug 30, 2010 at 3:35 PM,  <Jes.Sorensen@redhat.com> wrote:
>> From: Jes Sorensen <Jes.Sorensen@redhat.com>
>>
>> Hi,
>>
>> I started building QEMU with some more aggressive error flags to see
>> what dropped out. I started fixing up some of the cases, removing
>> unused arguments to functions, comparisons of unsigned types against
>> negative values etc. and a few other minor changes to avoid compiler
>> warnings.
> 
> If the patches make all such warnings disappear, you could also
> consider the same approach as taken by
> 7ccfb2eb5f9d91bdb4139cb420a3b5f8deb2f6e8 and
> ac41a6206fe9e1506010cd0aa9cf56ed3b37ae19.
> 
> If a GCC flag can be enabled, it should not be just -Wextra, because
> that means different things on different GCC versions, so please check
> also
>  a316e3788df2781fda119e801e9b3d753f89b752.

The one GCC flag I think we should enable, and probably was the one that
caught the most bugs in my patch set is this one: -Wtype-limits

There was only one false positive with this flag in block/blkdebug.c
where it bails on a < 0 comparison of an enum. enum doesn't seem to be
defined to being signed or unsigned, but a quick cast in that case would
make that single false positive go away.

Cheers,
Jes