[PATCH weston] Build: Silence shift-negative-value warning

[Derek Foreman]

On 20/06/16 06:57 PM, Daniel Stone wrote:
> Pixman's headers include a representation of -1 in fixed-point, which is
> -1 << 16. This trips a GCC warning about shifting negative values. As we
> can't do much about it, just silence the warning.
> 
> Signed-off-by: Daniel Stone <daniels at collabora.com>

Reviewed-by: Derek Foreman <derekf at osg.samsung.com>

> ---
>  configure.ac | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/configure.ac b/configure.ac
> index 5364c59..f2638fe 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -547,7 +547,8 @@ AM_CONDITIONAL(BUILD_SETBACKLIGHT, test "x$enable_setbacklight" = "xyes")
>  
>  if test "x$GCC" = "xyes"; then
>  	GCC_CFLAGS="-Wall -Wextra -Wno-unused-parameter \
> -		-Wno-missing-field-initializers -g -fvisibility=hidden \
> +		-Wno-shift-negative-value -Wno-missing-field-initializers \
> +		-g -fvisibility=hidden \
>  		-Wstrict-prototypes -Wmissing-prototypes -Wsign-compare"
>  fi
>  AC_SUBST(GCC_CFLAGS)
>