[PATCH libdrm] configure: Fix the <sys/sysmacros.h> check

[Emil Velikov]

On 4 May 2017 at 17:39, Adam Jackson <ajax at redhat.com> wrote:
> AC_HEADER_MAJOR only defines MAJOR_IN_SYSMACROS if major() is _not_
> defined by <sys/types.h> alone. It is, but it warns, and that's ugly.
> To fix this, push -Werror into CFLAGS when invoking AC_HEADER_MAJOR so
> the warning makes the compilation test fail.
>
> Signed-off-by: Adam Jackson <ajax at redhat.com>
> ---
>  configure.ac | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/configure.ac b/configure.ac
> index e5158b7d..43fcf68f 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -54,7 +54,11 @@ AC_USE_SYSTEM_EXTENSIONS
>  AC_SYS_LARGEFILE
>  AC_FUNC_ALLOCA
>
> +save_CFLAGS="$CFLAGS"
> +export CFLAGS="$CFLAGS -Werror"
>  AC_HEADER_MAJOR
> +CFLAGS="$save_CFLAGS"
> +
IIRC the Sun compiler supports (albeit undocumented) Werror if anyone
is using it. So this should be fine.

Reviewed-by: Emil Velikov <emil.velilkov at collabora.com>

-Emil