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target_var = $(1)/$(rule_target)/$(rule_top)
per_target = $($(call target_var,$(1)))
rule_top_path = $(core_info/$(rule_top)/path)
define target_entrypoint
$(1): rule_top := $$(rule_top)
$(1): rule_target := $$(rule_target)
endef
define check_target
ifneq ($$(target),$$(findstring $$(target),$$(targets)))
$$(error bad target '$$(target)')
endif
endef
define setup_submake_rules
.PHONY: $$(targets)
other_targets := $$(filter-out $$(target),$$(targets))
$$(foreach t,$$(targets),$$(eval $$(call top_rule,$$(t))))
ifeq (,$$(target))
$$(foreach other,$$(other_targets), \
$$(foreach core,$$(all_cores), \
$$(eval $$(call submake_rule,$$(other),$$(core)))))
else
$$(foreach core,$$(filter-out $$(top),$$(all_cores)), \
$$(eval $$(call submake_rule,$$(target),$$(core))))
endif
endef
define top_rule
$(1): $$(top_path)/$(1)
endef
define submake_rule
path := $$(core_info/$(2)/path)/$(1)
.PHONY: $$(path)
$$(path):
+$$(MAKE) --no-print-directory target=$(1) top=$(2) $$@
endef
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