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 13bb028..137ad61 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -97,10 +97,16 @@ 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))
@@ -112,7 +118,7 @@ $(STAGING_DIR_HOST)/.prepared: $(TMP_DIR)/.build
 
 
 define PrepareCommand
-$(STAGING_DIR_HOST)/bin/$(1): $(STAGING_DIR)/.prepared
+$(STAGING_DIR_HOST)/bin/$(1): $(STAGING_DIR_HOST)/.prepared
 	@mkdir -p "$$(dir $$@)"; rm -f "$$@"
 	@export FILE="$$$$(which $(2) 2>/dev/null | grep -v 'not found' | head -n1)"; [ -n "$$$$FILE" ] || { \
 		echo "Command $(1) not found."; false; \
@@ -121,7 +127,7 @@ $(STAGING_DIR_HOST)/bin/$(1): $(STAGING_DIR)/.prepared
 endef
 endif
 
-$(STAGING_DIR_HOST)/bin/stat: $(STAGING_DIR)/.prepared
+$(STAGING_DIR_HOST)/bin/stat: $(STAGING_DIR_HOST)/.prepared
 	@rm -f $@
 	@if stat --version > /dev/null 2>&1; then \
 		ln -s `which stat` $@; \
@@ -145,8 +151,8 @@ $(eval $(call PrepareCommand,tar,gtar tar))
 $(eval $(call PrepareCommand,diff,gdiff diff))
 
 $(curdir)/cmddeps = $(patsubst %,$(STAGING_DIR_HOST)/bin/%,md5sum cp stat seq python awk getopt grep tar diff)
-$(curdir)//prepare = $(STAGING_DIR)/.prepared $(STAGING_DIR_HOST)/.prepared $($(curdir)/cmddeps)
-$(curdir)//compile = $(STAGING_DIR)/.prepared $(STAGING_DIR_HOST)/.prepared $($(curdir)/cmddeps)
+$(curdir)//prepare = $(staging_prepared) $(STAGING_DIR_HOST)/.prepared $($(curdir)/cmddeps)
+$(curdir)//compile = $(staging_prepared) $(STAGING_DIR_HOST)/.prepared $($(curdir)/cmddeps)
 
 # prerequisites for the individual targets
 $(curdir)/ := .config prereq