[PATCH] configure: add AC_LANG_SOURCE call within AC_COMPILE_IFELSE

[Daniel Kurtz]

On Thu, Sep 19, 2013 at 9:21 AM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
> Documentation states that AC_*_IFELSE has to use AC_LANG_SOURCE or
> friends in order to generate the source code to compile.
> AC_LINK_IFELSE already handles this, thus convert AC_COMPILE_IFELSE
> to silence the final autoconf warnings.
>
> Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>

Reviewed-by: Daniel Kurtz <djkurtz at chromium.org>

I've been carrying the same patch locally for a while.

> ---
>
> While this patch is not strictly speaking necessary for the full/correct
> build of libdrm, it cuts down the configure'n'compile warnings to five.
> With the remaining being caused due to type conversion within exynos(4)
> and freedreno/kgsl(1). I planning to leave those to someone more aware
> of the respective codebase :)
>
>
> Cheers,
> Emil
>
> P.S. Keep me CC'd as I'm not subscribed to the list
> ---
>  configure.ac | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/configure.ac b/configure.ac
> index d2e232b..43e6954 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -111,7 +111,7 @@ AC_DEFUN([LIBDRM_CC_TRY_FLAG], [
>    libdrm_save_CFLAGS="$CFLAGS"
>    CFLAGS="$CFLAGS $1"
>
> -  AC_COMPILE_IFELSE([ ], [libdrm_cc_flag=yes], [libdrm_cc_flag=no])
> +  AC_COMPILE_IFELSE([AC_LANG_SOURCE([ ])], [libdrm_cc_flag=yes], [libdrm_cc_flag=no])
>    CFLAGS="$libdrm_save_CFLAGS"
>
>    if test "x$libdrm_cc_flag" = "xyes"; then
> --
> 1.8.4
>
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