[PATCH] configure: add AC_LANG_SOURCE call within AC_COMPILE_IFELSE

[Emil Velikov]

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>
---

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