configure.ac: Use nostdlib when checking for nostdinc

With clang nostdinc behaviour is influenced by nostdlib. Since we
always add nostdlib, add it in test as well

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Vladimir Serbinenko <phcoder@google.com>

diff --git a/configure.ac b/configure.ac
index 05d040cd6e77460316b00328a1a6110b5f6c5406..2f53a5683a01f3c57cb5a82ff45f9f58f0fd6f3a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1395,7 +1395,7 @@ AC_SUBST(TARGET_NMFLAGS_DEFINED_ONLY)
 if test "$platform" != emu; then
 AC_CACHE_CHECK([whether -nostdinc -isystem works], [grub_cv_cc_isystem], [
   SAVED_CPPFLAGS="$CPPFLAGS"
-  CPPFLAGS="$TARGET_CPPFLAGS -nostdinc -isystem `$TARGET_CC -print-file-name=include`"
+  CPPFLAGS="$TARGET_CPPFLAGS -nostdlib -nostdinc -isystem `$TARGET_CC -print-file-name=include`"
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdarg.h>
 #include <stddef.h>
 int va_arg_func (int fixed, va_list args);]], [[]])],