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# 
# Copyright (C) 2007 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#

SUBTARGETS:=clean download prepare compile install update refresh prereq

subtarget-default = $(filter-out ., \
	$(if $($(1)/builddirs-$(2)),$($(1)/builddirs-$(2)), \
	$(if $($(1)/builddirs-default),$($(1)/builddirs-default), \
	$($(1)/builddirs))))

define subtarget
  $(call warn_eval,$(1),t,T,$(1)/$(2): $($(1)/) $(foreach bd,$(call subtarget-default,$(1),$(2)),$(1)/$(bd)/$(2)))

endef

# Parameters: <subdir>
define subdir
  $(call warn,$(1),d,D $(1))
  $(foreach bd,$($(1)/builddirs),
    $(call warn,$(1),d,BD $(1)/$(bd))
    $(foreach target,$(SUBTARGETS),
      $(call warn_eval,$(1)/$(bd),t,T,$(1)/$(bd)/$(target): $($(1)/$(bd)/$(target)) $(call $(1)//$(target),$(1)/$(bd)))
		@+$$(MAKE) -j1 -C $(1)/$(bd) $(target)

      # legacy targets
      $(call warn_eval,$(1)/$(bd),l,T,$(1)/$(bd)-$(target): $(1)/$(bd)/$(target))
	)
  )
  $(foreach target,$(SUBTARGETS),$(call subtarget,$(1),$(target)))
endef

# Parameters: <subdir> <name> <target>
define stampfile
  $(1)/stamp-$(3):=$(STAGING_DIR)/stampfiles/.$(2)_$(3)
  $(call rdep,$(1),$$($(1)/stamp-$(3)),)

  $$($(1)/stamp-$(3)):
	@+$(MAKE) $(1)/$(3)
	@mkdir -p $$$$(dirname $$($(1)/stamp-$(3)))
	@touch $$($(1)/stamp-$(3))
  .PRECIOUS: $$($(1)/stamp-$(3)) # work around a make bug

  $(1)//clean:=$(1)/stamp-$(3)/clean
  $(1)/stamp-$(3)/clean: FORCE
	@rm -f $$($(1)/stamp-$(3))

endef