1.extract-bsp()-->
cp $LINUXOUT_DIR/bImage kernel
cp -rf $LINUXOUT_MODULE_DIR modules/modules
2.lunch()-->
print_lunch_menu()-->
//解析用户输入(数字索引)，确定用户选择的产品类型，编译类型等
export TARGET_PRODUCT=$product #uranus_nansu,aosp_dragon,...
export TARGET_BUILD_VARIANT=$variant #eng user userdebug
export TARGET_BUILD_TYPE=release
cd $T; CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core
command make --no-print-directory -f build/core/config.mk dumpvar-report_config
3.build/core/config.mk-->
include $(BUILD_SYSTEM)/pathmap.mk
CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk
XXXXXXXXXX:= $(BUILD_SYSTEM)/yyyyyyyyyy.mk
include $(BUILD_SYSTEM)/envsetup.mk-->
include $(BUILD_SYSTEM)/product_config.mk-->
include $(BUILD_SYSTEM)/product.mk #all product-ralated function definetion
include $(BUILD_SYSTEM)/device.mk #all device-ralated function definetion
all_product_configs := $(get-all-product-makefiles) # Read in all of the product definitions specified by the AndroidProducts.mk files in the tree.
all_product_makefiles :=$(FUNC all_product_configs) # 通过$all_product_configs获得$all_product_makefiles
# 通过$all_product_configs以及$TARGET_PRODUCT获得$current_product_makefile,如devicesoftwinneruranus-nansuuranus_nansu.mk
current_product_makefile := $(filter all_product_configs, TARGET_PRODUCT) # 通过$all_product_configs以及$TARGET_PRODUCT获得$current_product_makefile
(call import-products, $(current_product_makefile)) #check to make sure that products have all the necessary vars defined, SET PRODUCTS
PRODUCTS := device/softwinner/uranus-nansu/uranus_nansu.mk
TARGET_DEVICE := $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEVICE) #uranus-nansu
board_config_mk := (TARGET_DEVICE)/BoardConfig.mk #devicesoftwinneruranus-nansuBoardConfig.mk
include $(board_config_mk)
TARGET_DEVICE_DIR :=$(patsubst %/,%,$(dir $(board_config_mk))) #devicesoftwinneruranus-nansu
TARGET_xxx := yyyyyy
/*至此，所有的环节变量(全局)都已经赋值和确定*/
include $(BUILD_SYSTEM)/dumpvar.mk #打印输出部分全局变量值
4.make()-->前面所有过程都只是配置产品，设置环境变量，真正编译过程在这里正式开始。
DEFAULT_GOAL := droid # This is the default target. It must be the first declared target.
droid: droid_targets-->
droid_targets: apps_only #TARGET_BUILD_APPS = y
droid_targets: droidcore dist_files #TARGET_BUILD_APPS = y
.PHONY: droidcore
droidcore: files #prebuilt,$(modules_to_install),$(INSTALLED_ANDROID_INFO_TXT_TARGET)，真正内容最多的是：modules_to_install变量，其包含了当前配置下所有会被安装的模块（一个模块是否会被安装依赖于该产品的配置文件，模块的标签等信息）
systemimage #$(PRODUCT_OUT)/system.img
$(INSTALLED_BOOTIMAGE_TARGET) #$(PRODUCT_OUT)/boot.img
$(INSTALLED_RECOVERYIMAGE_TARGET) #$(PRODUCT_OUT)/recovery.img
$(INSTALLED_USERDATAIMAGE_TARGET) #$(PRODUCT_OUT)/userdata.img
$(INSTALLED_CACHEIMAGE_TARGET) #$(PRODUCT_OUT)/cache.img
$(INSTALLED_VENDORIMAGE_TARGET) #$(PRODUCT_OUT)/vendor.img
$(INSTALLED_SYSTEMOTHERIMAGE_TARGET) #$(PRODUCT_OUT)/system_other.img
$(INSTALLED_FILES_FILE) #$(PRODUCT_OUT)/installed-files.txt,编译完成后会将安装的文件列表更新到盖文件，提供过查看该文件，可以确定某次优化/增加的模块是否已经移除/加入
$(INSTALLED_FILES_FILE_VENDOR) #$(PRODUCT_OUT)/installed-files-vendor.txt
$(INSTALLED_FILES_FILE_SYSTEMOTHER) #$(PRODUCT_OUT)/installed-files-system-other.txt
$(call dist-for-goals, droidcore,
$(INTERNAL_UPDATE_PACKAGE_TARGET) #$(PRODUCT_OUT)/$(TARGET_PRODUCT)-img-$(FILE_NAME_TAG) //uranus_nansu-img-20191128.zip
$(INTERNAL_OTA_PACKAGE_TARGET) #$(PRODUCT_OUT)/$(TARGET_PRODUCT)-ota-$(FILE_NAME_TAG) //uranus_nansu-ota-20191128.zip
$(BUILT_OTATOOLS_PACKAGE) #$(PRODUCT_OUT)/otatools.zip
$(SYMBOLS_ZIP) #$(PRODUCT_OUT)/$(TARGET_PRODUCT)-symbols-$(FILE_NAME_TAG) //uranus_nansu-symbols-20191128.zip
$(INSTALLED_FILES_FILE) #$(PRODUCT_OUT)/installed-files.txt
$(INSTALLED_FILES_FILE_VENDOR) #$(PRODUCT_OUT)/installed-files-vendor.txt
$(INSTALLED_FILES_FILE_SYSTEMOTHER) #$(PRODUCT_OUT)/installed-files-system-other.txt
$(INSTALLED_BUILD_PROP_TARGET) #$(TARGET_OUT)/build.prop
$(BUILT_TARGET_FILES_PACKAGE) #$(intermediates)/$(TARGET_PRODUCT)-target_files-$(FILE_NAME_TAG) //uranus_nansu-target_files-20191128.zip
$(INSTALLED_ANDROID_INFO_TXT_TARGET) #$(PRODUCT_OUT)/android-info.txt
$(INSTALLED_RAMDISK_TARGET) #$(PRODUCT_OUT)/ramdisk.img
)
ifneq ($(ANDROID_BUILD_EMBEDDED),true)
ifneq ($(TARGET_BUILD_PDK),true)
$(call dist-for-goals, droidcore,
$(APPS_ZIP) #$(PRODUCT_OUT)/$(TARGET_PRODUCT)-apps-$(FILE_NAME_TAG) //uranus_nansu-apps-20191128.zip
#会将system/app,system/priv/app/目录中*.apk全部打包到zip文件中；
)
endif
注意：dist-for-goals()只有在$(filter dist,$(MAKECMDGOALS))返回真时才会有定义，即执行的make含有dist参数才会存在定义(make dist).
换而言之，droidcore后面依赖的这些文件/模块只有在编译发布时才会添加进来。主要是将这些依赖文件按指定格式(比如zip)拷贝至：out/dir/目录。
.PHONY: dist_files
ifeq ($(EMMA_INSTRUMENT),true) #只有($(EMMA_INSTRUMENT)为true，以及make dist时，才会赋值dist_files
$(EMMA_META_ZIP) : $(INSTALLED_SYSTEMIMAGE)
$(call dist-for-goals, dist_files, $(EMMA_META_ZIP))
endif
$(PRODUCTS)=device/softwinner/uranus-nansu/uranus_nansu.mk-->
$(call inherit-product, device/softwinner/uranus-common/uranus_64_bit.mk)
TARGET_ARCH:=
TARGET_2ND_ARCH:=
$(call inherit-product, build/target/product/full_base.mk)
# Get some sounds
$(call inherit-product-if-exists, frameworks/base/data/sounds/AllAudio.mk)
# Get the TTS language packs
$(call inherit-product-if-exists, external/svox/pico/lang/all_pico_languages.mk)
# Get a list of languages.
$(call inherit-product, $(SRC_TARGET_DIR)/product/locales_full.mk)
# Get everything else from the parent package
$(call inherit-product, $(SRC_TARGET_DIR)/product/generic_no_telephony.mk)
$(call inherit-product-if-exists, frameworks/base/data/fonts/fonts.mk)
$(call inherit-product-if-exists, external/hyphenation-patterns/patterns.mk)
$(call inherit-product-if-exists, frameworks/base/data/keyboards/keyboards.mk)
$(call inherit-product-if-exists, frameworks/webview/chromium/chromium.mk)
$(call inherit-product, $(SRC_TARGET_DIR)/product/core.mk)-->
$(call inherit-product, $(SRC_TARGET_DIR)/product/core_base.mk)-->
$(call inherit-product, $(SRC_TARGET_DIR)/product/core_minimal.mk)-->
$(call inherit-product, $(SRC_TARGET_DIR)/product/runtime_libart.mk) #Provides a functioning ART environment without Android frameworks
$(call inherit-product, $(SRC_TARGET_DIR)/product/base.mk)-->
$(call inherit-product, $(SRC_TARGET_DIR)/product/embedded.mk) # This is a build configuration for a very minimal build of the Open-Source part of the tree.
$(call inherit-product, device/softwinner/uranus-common/uranus-common.mk)-->
$(call inherit-product, device/softwinner/common/common.mk)-->
$(call inherit-product, vendor/aw/public/prebuild/bin/tools/tools.mk)
$(call inherit-product, vendor/aw/public/package/display/display.mk)
$(call inherit-product-if-exists, device/softwinner/uranus-t1/modules/modules.mk)
5.常见make命令
/*其他常用的make 目标*/
make clean 执行清理，等同于：rm -rf out/。
make sdk 编译出 Android 的 SDK。
make clean-sdk 清理 SDK 的编译产物。
make update-api 更新 API。在 framework API 改动之后，需要首先执行该命令来更新 API，公开的 API 记录在 frameworks/base/api 目录下。
make dist 执行 Build，并将 MAKECMDGOALS 变量定义的输出文件拷贝到 /out/dist 目录。
make all 编译所有内容，不管当前产品的定义中是否会包含。
make help 帮助信息，显示主要的 make 目标。
make snod 从已经编译出的包快速重建系统镜像。
make libandroid_runtime 编译所有 JNI framework 内容。
make framework 编译所有 Java framework 内容。
make services 编译系统服务和相关内容。
make <local_target> 编译一个指定的模块，local_target 为模块的名称。
make clean-<local_target> 清理一个指定模块的编译结果。
make dump-products 显示所有产品的编译配置信息，例如：产品名，产品支持的地区语言，产品中会包含的模块等信息。
make PRODUCT-xxx-yyy 编译某个指定的产品。
make bootimage 生成 boot.img
make recoveryimage 生成 recovery.img
make userdataimage 生成 userdata.img
make cacheimage 生成 cache.img