-# Default targets for subdirectory calls
-# Parameters:
-# 1: dependencies for the prepare step
-define default_subtargets
- %-download: FORCE
- $$(MAKE) -C $$(patsubst %-download,%,$$@) download
-
- %-prepare: $(1) FORCE
- $$(MAKE) -C $$(patsubst %-prepare,%,$$@) prepare
-
- %-compile: %-prepare
- $$(MAKE) -C $$(patsubst %-compile,%,$$@) compile
-
- %-install: %-compile
- $$(MAKE) -C $$(patsubst %-install,%,$$@) install
-
- %-clean: FORCE
- @$$(MAKE) -C $$(patsubst %-clean,%,$$@) clean
-endef
+empty:=
+space:= $(empty) $(empty)
+merge=$(subst $(space),,$(1))
+confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))