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

[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 <address@hidden>
> > ---
> >  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.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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