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here = $(if $(mod_path),$(mod_path)/)
mod_path :=
subdir_stack :=
unknown_core = $(error unknown core '$(1)')
all_cores :=
all_stamps :=
top_stamp = $(call core_stamp,$(rule_top))
core_stamp = $(obj)/deps/$(core_info/$(1)/path)/stamp
core_paths = \
$(patsubst /%,%, \
$(patsubst /,., \
$(abspath \
$(let prefix,$(core_info/$(1)/workdir), \
$(addprefix /$(if $(prefix),$(prefix)/),$(core_info/$(1)/$(2)))))))
require_core_paths = \
$(strip \
$(let val,$(strip $(call core_paths,$(1),$(2))), \
$(if $(val),$(val),$(error core '$(1)' must define '$(2)'))))
require_core_var = \
$(strip \
$(let val,$(core_info/$(1)/$(2)), \
$(if $(val),$(val),$(error core '$(1)' must define '$(2)'))))
define add_core
this := core_info/$(1)
ifneq (,$$($$(this)/path))
$$(error multiple definitions of core '$(1)': '$$($$(this)/path)' and '$(2)')
else ifneq (,$$(core_path/$(2)))
$$(error multiple cores under path '$(2)')
endif
$$(this)/path := $(2)
$$(this)/mod_file := $$(mod_file)
$$(this)/workdir := $$(mod_path)
$$(eval $$(call $(3)))
this :=
all_cores += $(1)
core_path/$(2) := $(1)
endef
define add_core_subdir
core :=
cores :=
subdirs :=
subdir_stack += $$(mod_path)
mod_path := $$(here)$(1)
mod_file := $$(here)mod.mk
include $$(mod_file)
$$(if $$(core), \
$$(eval $$(call add_core,$(notdir $(1)),$$(mod_path),core)))
$$(foreach core,$$(cores), \
$$(eval $$(call add_core,$$(core),$$(here)$$(core),core/$$(core))))
$$(foreach subdir,$$(subdirs), \
$$(eval $$(call add_core_subdir,$$(subdir))))
mod_path := $$(lastword $$(subdir_stack))
subdir_stack := $$(filter-out $$(mod_path),$$(subdir_stack))
endef
define setup_dep_tree
$$(foreach core,$$(all_cores), \
$$(eval $$(call defer,dep_tree/$$(core),$$$$(call get_core_deps,$$(core)))))
endef
define setup_stamp_rules
$$(foreach core,$$(all_cores), \
$$(let stamp,$$(call core_stamp,$$(core)), \
$$(stamp) \
$$(eval $$(call add_core_stamp,$$(core),$$(stamp))))): $$(build_makefiles) | $$(obj)
endef
define add_core_stamp
$(2): $$(core_info/$(1)/mod_file) \
$$(foreach dep,$$(core_info/$(1)/deps),$$(call core_stamp,$$(dep)))
all_stamps += $(2)
endef
define get_core_deps
dep_tree/$(1) :=
$$(foreach dep,$$(core_info/$(1)/deps), \
$$(if $$(core_info/$$(dep)/path),,$$(call unknown_core,$$(dep))) \
$$(eval dep_tree/$(1) := \
$$(dep_tree/$$(dep)) $$(filter-out $$(dep_tree/$$(dep)),$$(dep_tree/$(1)))))
dep_tree/$(1) := $$(strip $$(dep_tree/$(1)))
dep_tree/$(1) += $(1)
endef
map_core_deps = \
$(if $(findstring undefined,$(origin $(1)_deps/$(2))), \
$(eval $(call merge_mapped_deps,$(1),$(2)))) \
$($(1)_deps/$(2))
define merge_mapped_deps
$(1)_deps/$(2) := $$(core_info/$(2)/$(1))
$$(foreach dep,$$(core_info/$(2)/deps), \
$$(eval $(1)_deps/$(2) := \
$$(let mapped_dep,$$(call map_core_deps,$(1),$$(dep)), \
$$(mapped_dep) $$(filter-out $$(mapped_dep),$$($(1)_deps/$(2))))))
endef
define finish_stamp_rules
$$(all_stamps):
@mkdir -p $$$$(dirname $$@) && touch $$@
endef
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