Re: [Qemu-devel] [PATCH for-1.1?] slirp: Avoid statements without effect on Big Endian host

["Andreas Färber" <afaerber@suse.de>]

Am 27.05.2012 18:32, schrieb Andreas Färber:
> Darwin has HTON*/NTOH* macros that on BE simply return the argument.
> This is incompatible with SLIRP's use of these macros as a statement.
> 
> Special-case Darwin in the HOST_WORDS_BIGENDIAN code path to redefine
> these macros as no-op statement to avoid tons of compiler warnings.
> 
> Signed-off-by: Andreas Färber <andreas.faerber@web.de>
> ---
>  slirp/ip.h |   33 ++++++++++++++++++++++-----------
>  1 files changed, 22 insertions(+), 11 deletions(-)
> 
> diff --git a/slirp/ip.h b/slirp/ip.h
> index 88c903f..6e98b1d 100644
> --- a/slirp/ip.h
> +++ b/slirp/ip.h
> @@ -34,17 +34,28 @@
>  #define _IP_H_
>  
>  #ifdef HOST_WORDS_BIGENDIAN
> -# ifndef NTOHL
> -#  define NTOHL(d)
> -# endif
> -# ifndef NTOHS
> -#  define NTOHS(d)
> -# endif
> -# ifndef HTONL
> -#  define HTONL(d)
> -# endif
> -# ifndef HTONS
> -#  define HTONS(d)
> +# if defined(__APPLE__)
> +#  undef NTOHL
> +#  undef NTOHS
> +#  undef HTONL
> +#  undef HTONS
> +#  define NTOHL(d) do { } while (0)
> +#  define NTOHS(d) do { } while (0)
> +#  define HTONL(d) do { } while (0)
> +#  define HTONS(d) do { } while (0)
> +# else
> +#  ifndef NTOHL
> +#   define NTOHL(d)
> +#  endif
> +#  ifndef NTOHS
> +#   define NTOHS(d)
> +#  endif
> +#  ifndef HTONL
> +#   define HTONL(d)
> +#  endif
> +#  ifndef HTONS
> +#   define HTONS(d)
> +#  endif

Ahem, these would have the same issue. v2 coming up.

Andreas

>  # endif
>  #else
>  # ifndef NTOHL

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