Re: [Qemu-devel] [PATCH] bswap: fix compiler warning

[Stefan Weil <sw@weilnetz.de>]

Am 12.04.2013 22:23, schrieb Alexey Kardashevskiy:
> On 04/13/2013 03:36 AM, Stefan Weil wrote:
>> Am 12.04.2013 18:47, schrieb David Gibson:
>>> On Fri, Apr 12, 2013 at 12:51:51PM +0200, Andreas Färber wrote:
>>>> Am 12.04.2013 03:41, schrieb Alexey Kardashevskiy:
>>>>> The bswap functions use memcpy but the bswap.h header itself does
>>>>> not seem to
>>>>> include it in some configuration such as cross compiling for
>>>>> powerpc64
>>>>> on x86_64 machine (gcc 4.6.3 from ftp.kernel.org, headers/libs
>>>>> from FC18/ppc64),
>>>>> the example warning is below.
>>>>>
>>>>> The patch explicitly includes string.h.
>>>>>
>>>>>    CC    ppc64-softmmu/hw/virtio/virtio.o
>>>>> In file included from /home/alexey/qemu/include/libfdt_env.h:22:0,
>>>>>                   from
>>>>> /home/alexey/qemu/../lib4qemu/usr/include/libfdt.h:54,
>>>>>                   from /home/alexey/qemu/hw/nvram/spapr_nvram.c:25:
>>>>> /home/alexey/qemu/include/qemu/bswap.h: In function 'lduw_p':
>>>>> /home/alexey/qemu/include/qemu/bswap.h:244:5: warning: implicit
>>>>> declaration of function 'memcpy' [-Wimplicit-function-declaration]
>>>>> /home/alexey/qemu/include/qemu/bswap.h:244:5: warning:
>>>>> incompatible implicit declaration of built-in function 'memcpy'
>>>>> [enabled by default]
>>>>>
>>>>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>>>>> ---
>>>>>   include/qemu/bswap.h |    2 ++
>>>>>   1 file changed, 2 insertions(+)
>>>>>
>>>>> diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h
>>>>> index d3af35d..d50de0d 100644
>>>>> --- a/include/qemu/bswap.h
>>>>> +++ b/include/qemu/bswap.h
>>>>> @@ -1,6 +1,8 @@
>>>>>   #ifndef BSWAP_H
>>>>>   #define BSWAP_H
>>>>>
>>>>> +#include <string.h>
>>>>> +
>>>>>   #include "config-host.h"
>>>>>   #include <inttypes.h>
>>>>>   #include <limits.h>
>>>> Including string.h is certainly the right thing to do, but why do you
>>>> single it out first?
>>> Yeah, it probably shouldn't go above the config header.  Otherwise
>>> it's the right thing.
>>
>> If string.h went directly after limits.h, we'd even preserve the
>> alphabetic order of the system headers :-)
>
> Ah. Misunderstood the original question :) Do I need to repost it?


Yes, please - I think that would be good. You can also cc your patch
to qemu-trivial@nongnu.org, so it will be committed as a trivial patch.