+BUILD_DIR_NAME = _build
+COMPILED_DIR_NAME = _compiled
+
+BUILD_OMK_DIR := $(OUTPUT_DIR)/$(BUILD_DIR_NAME)/omk
+OMK_WORK_DIR := $(BUILD_OMK_DIR)$(RELATIVE_DIR:%=/%)
+
+check-dir::
+ $(Q3)$(call mkdir_def,$(BUILD_OMK_DIR))
+
+pass = $(strip $(1))
+
+# Call a pass in a subdirectory
+# Usage: $(call omk_pass_subdir_template,<pass name>,<subdir>)
+define omk_pass_subdir_template
+.PHONY: $(pass)-$(2)-subdir
+$(pass)-subdirs: $(pass)-$(2)-subdir
+$(pass)-$(2)-subdir:
+ +$(Q3)$(MAKE) SOURCES_DIR=$(SOURCES_DIR)/$(2) $(NO_PRINT_DIRECTORY) \
+ RELATIVE_DIR=$(RELATIVE_PREFIX)$(2) -C $(2) \
+ -f $(SUBDIR_MAKEFILE) $(pass)
+endef
+