From 3d6c7008e582b4009dd26390296b6ed91ec141ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Kijewski?= <rene.kijewski@fu-berlin.de>
Date: Fri, 16 May 2014 19:09:22 +0200
Subject: [PATCH] make: make clean usable together with `-j`

---
 Makefile.include | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile.include b/Makefile.include
index d0cbe7ddc0..0b0bcf6d87 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -106,6 +106,11 @@ USEMODULE_INCLUDES_ = $(shell echo $(USEMODULE_INCLUDES) | tr ' ' '\n' | awk '!a
 
 INCLUDES += $(USEMODULE_INCLUDES_:%=-I%)
 
+# The `clean` needs to be serialized before everything else.
+ifneq (, $(filter clean, $(MAKECMDGOALS)))
+    $(OBJ) $(BASELIBS) $(USEPKG:%=$(RIOTBASE)/pkg/%/Makefile.include): clean
+endif
+
 # include Makefile.includes for packages in $(USEPKG)
 $(RIOTBASE)/pkg/%/Makefile.include::
 	$(AD)"$(MAKE)" -C $(RIOTBASE)/pkg/$* Makefile.include