From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sat, 26 Jul 2014 06:10:23 +0200
Subject: tools/Makefile: fix host tools build dependencies

diff --git a/tools/Makefile b/tools/Makefile
index d2fe2ffddf4b7207a937ca75efe1c2728e8067aa..c6cded8eccd81c422f99e7ee50754c4bc66decc7 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -95,10 +95,16 @@ define PrepareStaging
 endef
 
 # preparatory work
+ifneq ($(ARCH),)
+staging_prepared = $(STAGING_DIR)/.prepared
+
 $(STAGING_DIR)/.prepared: $(TMP_DIR)/.build
 	$(call PrepareStaging,$(STAGING_DIR))
 	mkdir -p $(BUILD_DIR)/stamp
 	touch $@
+else
+staging_prepared :=
+endif
 
 $(STAGING_DIR_HOST)/.prepared: $(TMP_DIR)/.build
 	$(call PrepareStaging,$(STAGING_DIR_HOST))
@@ -110,8 +116,8 @@ $(STAGING_DIR_HOST)/.prepared: $(TMP_DIR)/.build
 
 endif
 
-$(curdir)//prepare = $(STAGING_DIR)/.prepared $(STAGING_DIR_HOST)/.prepared
-$(curdir)//compile = $(STAGING_DIR)/.prepared $(STAGING_DIR_HOST)/.prepared
+$(curdir)//prepare = $(staging_prepared) $(STAGING_DIR_HOST)/.prepared
+$(curdir)//compile = $(staging_prepared) $(STAGING_DIR_HOST)/.prepared
 
 # prerequisites for the individual targets
 $(curdir)/ := .config prereq