+
+# Call a pass in a subdirectory
+# Usage: $(call extra_rules_subdir_template,<subdir>)
+define extra_rules_subdir_template
+extra-rules-subdirs: extra-rules-$(1)
+extra-rules-$(1):
+ +@$(MAKE) OMK_SERIALIZE_INCLUDED=n MAKERULES_DIR=$(SOURCES_DIR)/$(1) OUTPUT_DIR=$(OUTPUT_DIR) \
+ SOURCES_DIR=$(SOURCES_DIR)/$(1) RELATIVE_DIR=$(RELATIVE_PREFIX)$(1) -C $(SOURCES_DIR)/$(1)
+endef
+
+.PHONY: extra-rules-subdirs
+extra-rules-subdirs:
+
+$(foreach subdir,$(EXTRA_RULES_SUBDIRS),$(eval $(call extra_rules_subdir_template,$(subdir))))
+
+# Usage: $(call omk_pass_template,<pass name>)
+define omk_pass_template
+.PHONY: $(pass) $(pass)-local $(pass)-msg $(pass)-subdirs
+$(pass): $(pass)-local
+$(pass)-local: $(pass)-subdirs $(pass)-msg
+$(foreach subdir,$(SUBDIRS),$(call omk_pass_subdir_template,$(pass),$(subdir)))
+
+$(pass)-msg: $(pass)-subdirs
+ +@echo "make[omk]: $(pass) in $(RELATIVE_DIR)"