Don't run preconfig, clean or distclean when it's not necessary.

.gitignore

@@ -17,6 +17,7 @@
 *~
 .built
 .depend
+.kconfig
 /*.lock
 /bin
 /boot_romfsimg.h

Application.mk

@@ -96,7 +96,7 @@ VPATH += :.
 # Targets follow
 
 all:: .built
-.PHONY: clean preconfig depend distclean
+.PHONY: clean depend distclean
 .PRECIOUS: $(BIN)
 
 define ELFASSEMBLE
@@ -195,8 +195,6 @@ install::
 
 endif # BUILD_MODULE
 
-preconfig::
-
 ifeq ($(CONFIG_NSH_BUILTIN_APPS),y)
 ifneq ($(PROGNAME),)
 ifneq ($(PRIORITY),)

Directory.mk

@@ -35,38 +35,38 @@
 
 include $(APPDIR)/Make.defs
 
-# Sub-directories
+# Sub-directories that have been built or configured.
 
-SUBDIRS = $(dir $(wildcard */Makefile))
+SUBDIRS       := $(dir $(wildcard *$(DELIM)Makefile))
+CONFIGSUBDIRS := $(filter-out $(dir $(wildcard *$(DELIM)Kconfig)),$(SUBDIRS))
+CLEANSUBDIRS  := $(dir $(wildcard *$(DELIM).built))
+CLEANSUBDIRS  += $(dir $(wildcard *$(DELIM).depend))
+CLEANSUBDIRS  += $(dir $(wildcard *$(DELIM).kconfig))
 
 all: nothing
 
-.PHONY: nothing context depend clean distclean
+.PHONY: nothing clean distclean
 
-$(foreach SDIR, $(SUBDIRS), $(eval $(call SDIR_template,$(SDIR),preconfig)))
-$(foreach SDIR, $(SUBDIRS), $(eval $(call SDIR_template,$(SDIR),context)))
-$(foreach SDIR, $(SUBDIRS), $(eval $(call SDIR_template,$(SDIR),depend)))
-$(foreach SDIR, $(SUBDIRS), $(eval $(call SDIR_template,$(SDIR),clean)))
-$(foreach SDIR, $(SUBDIRS), $(eval $(call SDIR_template,$(SDIR),distclean)))
+$(foreach SDIR, $(CONFIGSUBDIRS), $(eval $(call SDIR_template,$(SDIR),preconfig)))
+$(foreach SDIR, $(CLEANSUBDIRS), $(eval $(call SDIR_template,$(SDIR),clean)))
+$(foreach SDIR, $(CLEANSUBDIRS), $(eval $(call SDIR_template,$(SDIR),distclean)))
 
 nothing:
 
 install:
 
-preconfig: $(foreach SDIR, $(SUBDIRS), $(SDIR)_preconfig)
+preconfig: $(foreach SDIR, $(CONFIGSUBDIRS), $(SDIR)_preconfig)
 ifneq ($(MENUDESC),)
 	$(Q) $(MKKCONFIG) -m $(MENUDESC)
+	$(Q) touch .kconfig
 endif
 
-context: $(foreach SDIR, $(SUBDIRS), $(SDIR)_context)
+clean: $(foreach SDIR, $(CLEANSUBDIRS), $(SDIR)_clean)
 
-depend: $(foreach SDIR, $(SUBDIRS), $(SDIR)_depend)
-
-clean: $(foreach SDIR, $(SUBDIRS), $(SDIR)_clean)
-
-distclean: $(foreach SDIR, $(SUBDIRS), $(SDIR)_distclean)
+distclean: $(foreach SDIR, $(CLEANSUBDIRS), $(SDIR)_distclean)
 ifneq ($(MENUDESC),)
 	$(call DELFILE, Kconfig)
+	$(call DELFILE, .kconfig)
 endif
 
 -include Make.dep

Make.defs

@@ -53,9 +53,11 @@ endif
 # CLEANDIRS is the list of all top-level directories containing Makefiles.
 #   It is used only for cleaning.
 
-BUILDIRS  := $(dir $(wildcard $(APPDIR)$(DELIM)*$(DELIM)Make.defs))
-BUILDIRS  := $(filter-out $(APPDIR)$(DELIM)import$(DELIM),$(BUILDIRS))
-CLEANDIRS := $(dir $(wildcard $(APPDIR)$(DELIM)*$(DELIM)Makefile))
+BUILDIRS   := $(dir $(wildcard $(APPDIR)$(DELIM)*$(DELIM)Make.defs))
+BUILDIRS   := $(filter-out $(APPDIR)$(DELIM)import$(DELIM),$(BUILDIRS))
+CONFIGDIRS := $(filter-out $(APPDIR)$(DELIM)builtin$(DELIM),$(BUILDIRS))
+CONFIGDIRS := $(filter-out $(dir $(wildcard $(APPDIR)$(DELIM)*$(DELIM)Kconfig)),$(CONFIGDIRS))
+CLEANDIRS  := $(dir $(wildcard $(APPDIR)$(DELIM)*$(DELIM)Makefile))
 
 # CONFIGURED_APPS is the application directories that should be built in
 #   the current configuration.

Makefile

@@ -149,7 +149,7 @@ context_serialize:
 context: context_serialize
 
 Kconfig:
-	$(foreach SDIR, $(BUILDIRS), $(call MAKE_template,$(SDIR),preconfig))
+	$(foreach SDIR, $(CONFIGDIRS), $(call MAKE_template,$(SDIR),preconfig))
 	$(Q) $(MKKCONFIG)
 
 preconfig: Kconfig