From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 7 May 2014 22:57:10 +0200
Subject: tools/Makefile: fix host tools build dependencies

diff --git a/tools/Makefile b/tools/Makefile
index 6658f8c..26a3fb1 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -75,6 +75,7 @@ endif
 $(curdir)/builddirs := $(tools-y) $(tools-dep) $(tools-)
 $(curdir)/builddirs-default := $(tools-y)
 
+
 ifndef DUMP_TARGET_DB
 define PrepareStaging
 	@for dir in $(1); do ( \
@@ -86,10 +87,16 @@ 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))
@@ -101,7 +108,7 @@ $(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; \
@@ -110,7 +117,7 @@ $(STAGING_DIR_HOST)/bin/$(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` $@; \
@@ -128,8 +135,8 @@ $(eval $(call PrepareCommand,seq,gseq seq))
 $(eval $(call PrepareCommand,python,python2 python))
 
 $(curdir)/cmddeps = $(patsubst %,$(STAGING_DIR_HOST)/bin/%,find md5sum cp stat seq python)
-$(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