xxx（机型名）为例
在build/core/main.mk中， 会包含build/core/config.mk，在config.mk中，会包含build/core/envsetup.mk，在envsetup.mk中有：
# Read the product specs so we can get TARGET_DEVICE and other
# variables that we need in order to locate the output files.
include $(BUILD_SYSTEM) /product_config .mk
.......
# Boards may be defined under $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)
# or under vendor/*/$(TARGET_DEVICE). Search in both places, but
# make sure only one exists.
# Real boards should always be associated with an OEM vendor.
board_config_mk := \
$(strip $(wildcard \
$(SRC_TARGET_DIR) /board/ $(TARGET_DEVICE) /BoardConfig .mk \
$(shell test -d device && find device -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk' ) \
$(shell test -d vendor && find vendor -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk' ) \
))
ifeq ($(board_config_mk),)
$(error No config file found for TARGET_DEVICE $(TARGET_DEVICE))
endif
ifneq ($(words $(board_config_mk)),1)
$(error Multiple board config files for TARGET_DEVICE $(TARGET_DEVICE): $(board_config_mk))
endif
include $(board_config_mk)
ifeq ($(TARGET_ARCH),)
$(error TARGET_ARCH not defined by board config: $(board_config_mk))
endif
TARGET_DEVICE_DIR := $(patsubst %/,%,$( dir $(board_config_mk)))
board_config_mk :=
|
这里首先在main.mk最前面有：
TOPDIR :=
BUILD_SYSTEM := $(TOPDIR)build/core
因此在envsetup.mk中会include build/core/product_config.mk
在product_config.mk中有：
# ---------------------------------------------------------------
# Include the product definitions.
# We need to do this to translate TARGET_PRODUCT into its
# underlying TARGET_DEVICE before we start defining any rules.
#
include $(BUILD_SYSTEM) /node_fns .mk
include $(BUILD_SYSTEM) /product .mk
include $(BUILD_SYSTEM) /device .mk
ifneq ($(strip $(TARGET_BUILD_APPS)),)
# An unbundled app build needs only the core product makefiles.
all_product_configs := $(call get-product-makefiles,\
$(SRC_TARGET_DIR) /product/AndroidProducts .mk)
else
# Read in all of the product definitions specified by the AndroidProducts.mk
# files in the tree.
all_product_configs := $(get-all-product-makefiles)
endif
|
先调用 build/core/product.mk中定义的函数get-all-product-makefiles ，get-all-product-makefiles函数会返回所有的.mk文件中的宏PRODUCT_MAKEFILES ，
在product.mk开始有：
#
# Returns the list of all AndroidProducts.mk files.
# $(call ) isn't necessary.
#
define _find-android-products-files
$(shell test -d device && find device -maxdepth 6 -name AndroidProducts.mk) \
$(shell test -d vendor && find vendor -maxdepth 6 -name AndroidProducts.mk) \
$(SRC_TARGET_DIR) /product/AndroidProducts .mk
endef
#
# Returns the sorted concatenation of PRODUCT_MAKEFILES
# variables set in the given AndroidProducts.mk files.
# $(1): the list of AndroidProducts.mk files.
#
define get-product-makefiles
$( sort \
$(foreach f,$(1), \
$( eval PRODUCT_MAKEFILES :=) \
$( eval LOCAL_DIR := $(patsubst %/,%,$( dir $(f)))) \
$( eval include $(f)) \
$(PRODUCT_MAKEFILES) \
) \
$( eval PRODUCT_MAKEFILES :=) \
$( eval LOCAL_DIR :=) \
)
endef
#
# Returns the sorted concatenation of all PRODUCT_MAKEFILES
# variables set in all AndroidProducts.mk files.
# $(call ) isn't necessary.
#
define get-all-product-makefiles
$(call get-product-makefiles,$(_find-android-products-files))
endef
|
因此这里会找到device下的所有AndroidProducts.mk，不同子目录下的AndroidProducts.mk 中定义了不同的 PRODUCT_NAME, PRODUCT_DEVICE 等信息
# Import all product makefiles.
$(call import-products, $(all_product_makefiles))
调用import-products,读取找到的所有的AndrodProducts.mk文件中定义的产品信息，import-products函数去验证这些产品配置文件是否都包含有必须的配置信息
然后有：
# Convert a short name like "sooner" into the path to the product
# file defining that product.
#
INTERNAL_PRODUCT := $(call resolve-short-product-name, $(TARGET_PRODUCT))
ifneq ($(current_product_makefile),$(INTERNAL_PRODUCT))
$(error PRODUCT_NAME inconsistent in $(current_product_makefile) and $(INTERNAL_PRODUCT))
endif
current_product_makefile :=
all_product_makefiles :=
all_product_configs :=
|
xxx（机型名）
调用函数resolve-short-product-name，它将返回TARGET_PRODUCT代表的配置文件路径，并赋给INTERNAL_PRODUCT，因此这里就是device/***/xxx/xxx.mk
# Find the device that this product maps to.
TARGET_DEVICE := $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEVICE)
之后TARGET_DEVICE取值xxx
回到envsetup.mk中，
board_config_mk := \
$(strip $(wildcard \
$(SRC_TARGET_DIR) /board/ $(TARGET_DEVICE) /BoardConfig .mk \
$(shell test -d device && find device -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk' ) \
$(shell test -d vendor && find vendor -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk' ) \
))
ifeq ($(board_config_mk),)
$(error No config file found for TARGET_DEVICE $(TARGET_DEVICE))
endif
ifneq ($(words $(board_config_mk)),1)
$(error Multiple board config files for TARGET_DEVICE $(TARGET_DEVICE): $(board_config_mk))
endif
include $(board_config_mk)
ifeq ($(TARGET_ARCH),)
$(error TARGET_ARCH not defined by board config: $(board_config_mk))
endif
TARGET_DEVICE_DIR := $(patsubst %/,%,$( dir $(board_config_mk)))
board_config_mk :=
|
这里先在device下按照xxx/BoardConfig.mk这个规则搜索，会找到device/***/xxx/下的BoardConfig.mk文件，将路径赋值给TARGET_DEVICE_DIR
***/xxx
