[llbuild] Refactor import_dir to match other Makefiles

Signed-off-by: Björn Bidar <bjorn.bidar@jolla.com>

Author: Thaodan

llbuild/Makefile.include

@@ -1,4 +1,4 @@
-# ll build system
+# ll build system -*- makefile -*-
 #
 # Copyright (C) 2006-2007 Lauri Leukkunen <lle@rahina.org>
 #
@@ -41,15 +41,17 @@ endef
 define import_dir
 	subdirs := 
 	subdirs-y :=
-	objects :=
-	objects-y :=
+	objs :=
+	objs-y :=
 	D := $(1)
 	$(shell mkdir -p $(1))
 	include $(1)/Makefile
-	dep_files := $$(wildcard $(1)/.*.d)
-	include $(dep_files)
-	all_objects := $$(all_objects) $$(patsubst %,$(1)/%,$$(objects))
-	all_objects := $$(all_objects) $$(patsubst %,$(1)/%,$$(objects-y))
+	deps := $(join $(subst ./, $(D)/, $(dir $(objs))), $(patsubst %,.%.d,$(notdir $(objs))))
+	objs-y := $(join $(subst ./, $(D)/, $(dir $(objs))), $(notdir $(objs)))
+	objs-all := $(objs-all) \
+	 	$(patsubst %,$(OBJDIR)%,$(objs-y))
+    deps-all := $(deps-all) $(patsubst %,$(OBJDIR)%,$(deps))
+    include $(wildcard $(deps))
 	subdirs := $$(subdirs) $$(subdirs-y)
 	tmp := $$(patsubst %,$(1)/%,$$(subdirs))
 	perkele := $$(foreach dir,$$(tmp),$$(eval $$(call import_dir,$$(dir))))
@@ -58,8 +60,9 @@ endef
 $(foreach dir,$(subdirs),$(eval $(call import_dir,$(dir))))
 
 
-all_objects += $(foreach t,$(extra_targets),$($(t)))
+objs-all += $(foreach t,$(extra_targets),$($(t)))
 
+CLEAN_FILES += $(deps-all)
 
 ifdef V
 Q =