This is xnu-6153.11.26. See this file in:
# -*- mode: makefile;-*-
#
# Copyright (C) 1999-2016 Apple Inc. All rights reserved.
#
# MakeInc.dir contains the recursion rules for the build system.
# For instance, the "build_installhdrs_md" target is auto-generated
# such that make(1) recurses into a specified set of subdirectories
# (building "build_installhdrs_md" in turn at each level) before
# building the special "do_installhdrs_md" target at the current
# level. "do_installhdrs_md" is defined in MakeInc.rule.
#

# $(1) is the name of the target to produce that will perform the
#      recursive behavior via dependencies
# $(2) is a list of subdirectories to recurse into
# $(3) is the target to build with a sub-make after
#      the subdirectories have been recursed into
# $(4) should be "1" if TARGET should be pinned to the per-arch
#      build COMPONENT directory, or empty if it should recurse
#      in lockstep with the source recursion
define RECURSIVE_BUILD_RULES_template
$(1)_recurse_target_list = $$(addprefix $(1)_recurse_into_,$(2))

.PHONY: $$($(1)_recurse_target_list)

$$($(1)_recurse_target_list):
	$$(_v)$$(MKDIR) "$$(CURDIR)/$$(patsubst $(1)_recurse_into_%,%,$$@)"
	$$(_v)$${MAKE} -C "$$(CURDIR)/$$(patsubst $(1)_recurse_into_%,%,$$@)"	\
		-f "$$(SOURCE)$$(patsubst $(1)_recurse_into_%,%,$$@)/Makefile"	\
		CURRENT_KERNEL_CONFIG=$${CURRENT_KERNEL_CONFIG}		\
		CURRENT_ARCH_CONFIG=$${CURRENT_ARCH_CONFIG}		\
		CURRENT_MACHINE_CONFIG=$${CURRENT_MACHINE_CONFIG}	\
		CURRENT_BUILD_CONFIG=$${CURRENT_BUILD_CONFIG}		\
		SOURCE="$$(SOURCE)$$(patsubst $(1)_recurse_into_%,%,$$@)/"	\
		RELATIVE_SOURCE_PATH="$$(RELATIVE_SOURCE_PATH)/$$(patsubst $(1)_recurse_into_%,%,$$@)"	\
		TARGET=$(if $(4),$${OBJPATH}/$$(COMPONENT),$$(TARGET)$$(patsubst $(1)_recurse_into_%,%,$$@)/)		\
		OBJPATH=$${OBJPATH}					\
		$(1);

.PHONY: $(1)

$(1): $$($(1)_recurse_target_list)
	$$(_v)$${MAKE} -C "$$(CURDIR)"						\
		-f $$(firstword $$(MAKEFILE_LIST))				\
		CURRENT_KERNEL_CONFIG=$${CURRENT_KERNEL_CONFIG}			\
		CURRENT_ARCH_CONFIG=$${CURRENT_ARCH_CONFIG}			\
		CURRENT_MACHINE_CONFIG=$${CURRENT_MACHINE_CONFIG}		\
		CURRENT_BUILD_CONFIG=$${CURRENT_BUILD_CONFIG}			\
		SOURCE=$$(SOURCE)						\
		RELATIVE_SOURCE_PATH=$$(RELATIVE_SOURCE_PATH)			\
		TARGET=$$(TARGET)						\
		OBJPATH=$${OBJPATH}						\
		$(3);
endef

#
# Setup pass for  all architectures for all Configuration/Architecture options
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_setup,$(SETUP_SUBDIRS),do_build_setup,))

#
# Install machine independent kernel header files
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_installhdrs_mi,$(INSTINC_SUBDIRS),do_installhdrs_mi,))

#
# Install machine dependent kernel header files
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_installhdrs_md,$(INSTINC_SUBDIRS_$(CURRENT_ARCH_CONFIG)),do_installhdrs_md,))

#
# Install machine independent kernel header files
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_exporthdrs_mi,$(EXPINC_SUBDIRS),do_exporthdrs_mi,))

#
# Install machine dependent kernel header files
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_exporthdrs_md,$(EXPINC_SUBDIRS_$(CURRENT_ARCH_CONFIG)),do_exporthdrs_md,))

#
# Build all architectures for all Configuration/Architecture options
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_all,$(COMP_SUBDIRS) $(COMP_SUBDIRS_$(CURRENT_ARCH_CONFIG)),do_build_all,1))

#
# Post-process build results
#
$(eval $(call RECURSIVE_BUILD_RULES_template,config_all,$(CONFIG_SUBDIRS),do_config_all,1))

#
# Install for all architectures for all Configuration/Architecture options
#
$(eval $(call RECURSIVE_BUILD_RULES_template,build_install_primary,$(INST_SUBDIRS),do_build_install_primary,1))
$(eval $(call RECURSIVE_BUILD_RULES_template,build_install_non_primary,$(INST_SUBDIRS),do_build_install_non_primary,1))
$(eval $(call RECURSIVE_BUILD_RULES_template,config_install,$(CONFIG_SUBDIRS),do_config_install,1))

#
# Install text files
#
$(eval $(call RECURSIVE_BUILD_RULES_template,textfiles_install,$(INSTTEXTFILES_SUBDIRS),do_textfiles_install,))

# vim: set ft=make: