From e34b0064456f797dabd22fa3b8f248d7be6e3475 Mon Sep 17 00:00:00 2001
From: Martin Lenders <mail@martin-lenders.de>
Date: Sun, 23 Feb 2014 21:04:58 +0100
Subject: [PATCH] Fix rpl app for clang

---
 examples/rpl_udp/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/rpl_udp/Makefile b/examples/rpl_udp/Makefile
index 2228c286b9..0a267c13f4 100644
--- a/examples/rpl_udp/Makefile
+++ b/examples/rpl_udp/Makefile
@@ -28,7 +28,11 @@ export RIOTBASE ?= $(CURDIR)/../..
 export QUIET ?= 1
 
 # get rid of the mandatory RPL warning
-CFLAGS += "-Wno-cpp"
+ifeq ($(shell $(CC) -Wno-cpp -E - 2>/dev/null >/dev/null dev/null ; echo $$?),0)
+	ifeq ($(shell LANG=C $(CC) -Wno-cpp -E - 2>&1 1>/dev/null dev/null | grep warning: | grep -- -Wno-cpp),)
+		CFLAGS += -Wno-cpp
+	endif
+endif
 
 # Modules to include: