# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2007-2020 OpenWrt.org

ifeq ($(MAKECMDGOALS),prereq)
  SUBTARGETS:=prereq
  PREREQ_ONLY:=1
# For target/linux related target add dtb to selectively compile dtbs
else ifneq ($(filter target/linux/%,$(MAKECMDGOALS)),)
  SUBTARGETS:=$(DEFAULT_SUBDIR_TARGETS) dtb
else
  SUBTARGETS:=$(DEFAULT_SUBDIR_TARGETS)
endif

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

define ERROR
	($(call MESSAGE, $(2)); $(if $(BUILD_LOG), echo "$(2)" >> $(BUILD_LOG_DIR)/$(1)/error.txt;) $(if $(3),, exit 1;))
endef

diralias=$(if $(findstring /,$(1)),$(notdir $(1)))

subdir_make_opts = \
	$(if $(SUBDIR_MAKE_DEBUG),-d) -r -C $(1) \
		BUILD_SUBDIR="$(1)" \
		BUILD_VARIANT="$(4)" \
		ALL_VARIANTS="$(5)"

# 1: subdir
# 2: target
# 3: build type
# 4: build variant
# 5: all variants
log_make = \
	 $(if $(call debug,$(1),v),,@)+ \
	 $(if $(BUILD_LOG), \
		set -o pipefail; \
		mkdir -p $(BUILD_LOG_DIR)/$(1)$(if $(4),/$(4));) \
	$(SCRIPT_DIR)/time.pl "time: $(1)$(if $(4),/$(4))/$(if $(3),$(3)-)$(2)" \
	$(SUBMAKE) $(subdir_make_opts) $(if $(3),$(3)-)$(2) \
		$(if $(BUILD_LOG),SILENT= 2>&1 | tee $(BUILD_LOG_DIR)/$(1)$(if $(4),/$(4))/$(if $(3),$(3)-)$(2).txt)

ifdef CONFIG_AUTOREMOVE
rebuild_check = \
	@-$(NO_TRACE_MAKE) $(subdir_make_opts) check-depends >/dev/null 2>/dev/null; \
		$(if $(BUILD_LOG),mkdir -p $(BUILD_LOG_DIR)/$(1)$(if $(4),/$(4));) \
		$(NO_TRACE_MAKE) $(if $(BUILD_LOG),-d) -q $(subdir_make_opts) .$(if $(3),$(3)-)$(2) \
			> $(if $(BUILD_LOG),$(BUILD_LOG_DIR)/$(1)$(if $(4),/$(4))/check-$(if $(3),$(3)-)$(2).txt,/dev/null) 2>&1 || \
			$(SUBMAKE) $(subdir_make_opts) clean-build >/dev/null 2>/dev/null

endif

subdir_variants = $(filter-out *,$(if $(BUILD_VARIANT),$(BUILD_VARIANT),$(if $(strip $($(1)/variants)),$($(1)/variants),$(if $($(1)/default-variant),$($(1)/default-variant),__default))))

# Parameters: <subdir> <builddir> <target> <variant>
define subdir_variant
	$(if $(BUILD_LOG),@mkdir -p $(BUILD_LOG_DIR)/$(1)/$(2)/$(filter-out __default,$(4)))
	$(if $($(1)/autoremove),$(call rebuild_check,$(1)/$(2),$(3),,$(filter-out __default,$(4)),$($(1)/$(2)/variants)))
	$(call log_make,$(1)/$(2),$(3),,$(filter-out __default,$(4)),$($(1)/$(2)/variants)) \
		|| $(call ERROR,$(1),   ERROR: $(1)/$(2) failed to build$(if $(filter-out __default,$(4)), (build variant: $(4))).,$(findstring $(2),$($(1)/builddirs-ignore-$(3))))
endef

# Parameters: <subdir> <builddir> <target> <build type>
define subdir_btype
	$(call log_make,$(1)/$(2),$(3),$(4),,$($(1)/$(2)/variants)) \
		|| $(call ERROR,$(1),   ERROR: $(1)/$(2) [$(4)] failed to build.,$(findstring $(2),$($(1)/builddirs-ignore-$(4)-$(3))))
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) $($(1)/subtargets),
      $(foreach btype,$(buildtypes-$(bd)),
        $(call warn_eval,$(1)/$(bd),t,T,$(1)/$(bd)/$(btype)/$(target): $(if $(NO_DEPS)$(QUILT),,$($(1)/$(bd)/$(btype)/$(target)) $(call $(1)//$(btype)/$(target),$(1)/$(bd)/$(btype))))
	$$(call subdir_btype,$(1),$(bd),$(target),$(btype))
        $(if $(call diralias,$(bd)),$(call warn_eval,$(1)/$(bd),l,T,$(1)/$(call diralias,$(bd))/$(btype)/$(target): $(1)/$(bd)/$(btype)/$(target)))
      )
      $(if $($(1)/$(bd)/parallel-variants),
        $(foreach variant,$(call subdir_variants,$(1)/$(bd)),
          $(call warn_eval,$(1)/$(bd),t,T,$(1)/$(bd)/$(variant)/$(target): $(if $(NO_DEPS)$(QUILT),,$($(1)/$(bd)/$(target)) $(call $(1)//$(target),$(1)/$(bd))))
	$$(call subdir_variant,$(1),$(bd),$(target),$(variant))
        )
        $(call warn_eval,$(1)/$(bd),t,T,$(1)/$(bd)/$(target): $(foreach variant,$(call subdir_variants,$(1)/$(bd)),$(1)/$(bd)/$(variant)/$(target)))
      ,
        $(call warn_eval,$(1)/$(bd),t,T,$(1)/$(bd)/$(target): $(if $(NO_DEPS)$(QUILT),,$($(1)/$(bd)/$(target)) $(call $(1)//$(target),$(1)/$(bd))))
          $(foreach variant,$(call subdir_variants,$(1)/$(bd)),
	$$(call subdir_variant,$(1),$(bd),$(target),$(variant))
          )
      )
      $(if $(PREREQ_ONLY)$(DUMP_TARGET_DB),,
        # aliases
        $(if $(call diralias,$(bd)),$(call warn_eval,$(1)/$(bd),l,T,$(1)/$(call diralias,$(bd))/$(target): $(1)/$(bd)/$(target)))
	  )
	)
  )
  $(foreach target,$(SUBTARGETS) $($(1)/subtargets),$(call subtarget,$(1),$(target)))
endef

ifndef DUMP_TARGET_DB
# Parameters: <subdir> <name> <target> <depends> <config options> <stampfile location>
define stampfile
  $(1)/stamp-$(3):=$(if $(6),$(6),$(STAGING_DIR))/stamp/.$(2)_$(3)$(5)
  $$($(1)/stamp-$(3)): $(TMP_DIR)/.build $(4)
	@+$(SCRIPT_DIR)/timestamp.pl -n $$($(1)/stamp-$(3)) $(1) $(4) || \
		$(MAKE) $(if $(QUIET),--no-print-directory) $$($(1)/flags-$(3)) $(1)/$(3)
	@mkdir -p $$$$(dirname $$($(1)/stamp-$(3)))
	@touch $$($(1)/stamp-$(3))

  $$(if $(call debug,$(1),v),,.SILENT: $$($(1)/stamp-$(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
endif