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| 关键词： nbsp TARGET PRODUCT build SYSTEM ROOT mk LIBRARIES LIBRARY 文件 |
通过上篇文章，我们分析了编译android时source build/envsetup.sh和lunch命令，在执行完上述两个命令后， 我们就可以进行编译android了。 1. make 执行make命令的结果就是去执行当前目录下的Makefile文件，我们来看下它的内容： [html] 1 ### DO NOT EDIT THIS FILE ### 2 include build/core/main.mk 3 ### DO NOT EDIT THIS FILE ### 1 ### DO NOT EDIT THIS FILE ### 2 include build/core/main.mk 3 ### DO NOT EDIT THIS FILE ### 呵呵，看到上面 的内容，我们都会笑，这是我见过最简单的Makefile了，我们再看下build/core/main.mk 在main.mk里，定义了变量TOPDIR，TOP为当前目录，BUILD_SYSTEM为build/core目录。 在49行，包含了build/core/config.mk文件。 后面的代码是check环境 变量，所有的Makefile都通过build/core/main.mk这个文件组织在一起，它定义了一个默认goals：droid，当我们在TOP目录下，敲Make实际上就等同于我们执行make droid。当Make include所有的文件，完成对所有make我文件的解析以后就会寻找生成droid的规则，依次生成它的依赖，直到所有满足的模块被编译好，然后使用相应的工具打包成相应的img。这儿不是我们的重点，不再多说。 2. build/core/config.mk 该文件被main.mk包含。 定义了以下环境变量： [plain] 16 SRC_HEADERS := \ 17 $(TOPDIR)system/core/include \ 18 $(TOPDIR)hardware/libhardware/include \ 19 $(TOPDIR)hardware/libhardware_legacy/include \ 20 $(TOPDIR)hardware/ril/include \ 21 $(TOPDIR)dalvik/libnativehelper/include \ 22 $(TOPDIR)frameworks/base/include \ 23 $(TOPDIR)frameworks/base/opengl/include \ 24 $(TOPDIR)external/skia/include 25 SRC_HOST_HEADERS:=$(TOPDIR)tools/include 26 SRC_LIBRARIES:= $(TOPDIR)libs 27 SRC_SERVERS:= $(TOPDIR)servers 28 SRC_TARGET_DIR := $(TOPDIR)build/target 29 SRC_API_DIR := $(TOPDIR)frameworks/base/api 16 SRC_HEADERS := \ 17 $(TOPDIR)system/core/include \ 18 $(TOPDIR)hardware/libhardware/include \ 19 $(TOPDIR)hardware/libhardware_legacy/include \ 20 $(TOPDIR)hardware/ril/include \ 21 $(TOPDIR)dalvik/libnativehelper/include \ 22 $(TOPDIR)frameworks/base/include \ 23 $(TOPDIR)frameworks/base/opengl/include \ 24 $(TOPDIR)external/skia/include 25 SRC_HOST_HEADERS:=$(TOPDIR)tools/include 26 SRC_LIBRARIES:= $(TOPDIR)libs 27 SRC_SERVERS:= $(TOPDIR)servers 28 SRC_TARGET_DIR := $(TOPDIR)build/target 29 SRC_API_DIR := $(TOPDIR)frameworks/base/api[plain] .....然后定义了下面几个重要的编译命令 .....然后定义了下面几个重要的编译命令[plain] 43 CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk 44 BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk 45 BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk 46 BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk 47 BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk 48 BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk 49 BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk 50 BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk 51 BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk 52 BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk 53 BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk 54 BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk 55 BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk 56 BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk 57 BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk 58 BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk 59 BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk 60 BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk 61 BUILD_KEY_CHAR_MAP := $(BUILD_SYSTEM)/key_char_map.mk 43 CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk 44 BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk 45 BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk 46 BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk 47 BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk 48 BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk 49 BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk 50 BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk 51 BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk 52 BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk 53 BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk 54 BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk 55 BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk 56 BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk 57 BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk 58 BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk 59 BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk 60 BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk 61 BUILD_KEY_CHAR_MAP := $(BUILD_SYSTEM)/key_char_map.mk上述命令变量其实是对应的mk文件名，所有的Android.mk文件里基本上都包含上述命令变量，如： CLEAR_VARS：用来清除之前定义的环境变量 BUILD_SHARED_LIBRARY：用来指定编译动态库过程 [plain] 109 # --------------------------------------------------------------- 110 # Define most of the global variables. These are the ones that 111 # are specific to the user's build configuration. 112 include $(BUILD_SYSTEM)/envsetup.mk 113 114 # Boards may be defined under $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE) 115 # or under vendor/*/$(TARGET_DEVICE). Search in both places, but 116 # make sure only one exists. 117 # Real boards should always be associated with an OEM vendor. 118 board_config_mk := \ 119 $(strip $(wildcard \ 120 $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)/BoardConfig.mk \ 121 vendor/*/$(TARGET_DEVICE)/BoardConfig.mk \ 122 )) 123 ifeq ($(board_config_mk),) 124 $(error No config file found for TARGET_DEVICE $(TARGET_DEVICE)) 125 endif 126 ifneq ($(words $(board_config_mk)),1) 127 $(error Multiple board config files for TARGET_DEVICE $(TARGET_DEVICE): $(board_config_mk)) 128 endif 129 include $(board_config_mk) 130 TARGET_DEVICE_DIR := $(patsubst %/,%,$(dir $(board_config_mk))) 131 board_config_mk := 109 # ---------------------------------------------------------------110 # Define most of the global variables. These are the ones that111 # are specific to the user's build configuration.112 include $(BUILD_SYSTEM)/envsetup.mk113114 # Boards may be defined under $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)115 # or under vendor/*/$(TARGET_DEVICE). Search in both places, but116 # make sure only one exists.117 # Real boards should always be associated with an OEM vendor.118 board_config_mk := \119 $(strip $(wildcard \120 $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)/BoardConfig.mk \121 vendor/*/$(TARGET_DEVICE)/BoardConfig.mk \122 ))123 ifeq ($(board_config_mk),)124 $(error No config file found for TARGET_DEVICE $(TARGET_DEVICE))125 endif126 ifneq ($(words $(board_config_mk)),1)127 $(error Multiple board config files for TARGET_DEVICE $(TARGET_DEVICE): $(board_config_mk))128 endif129 include $(board_config_mk)130 TARGET_DEVICE_DIR := $(patsubst %/,%,$(dir $(board_config_mk)))131 board_config_mk :=112行又包含了另外一个重要的mk文件envsetup.mk，我们来看一下。 3. envsetup.mk [plain] 25 ifeq ($(TARGET_PRODUCT),) #判断TARGET_PRODUCT是否为空， 26 ifeq ($(TARGET_SIMULATOR),true) 27 TARGET_PRODUCT := sim 28 else 29 TARGET_PRODUCT := generic 30 endif 31 endif 25 ifeq ($(TARGET_PRODUCT),) #判断TARGET_PRODUCT是否为空， 26 ifeq ($(TARGET_SIMULATOR),true) 27 TARGET_PRODUCT := sim 28 else 29 TARGET_PRODUCT := generic 30 endif 31 endif第25行，判断TARGET_PRODUCT是否为空，根据上一节分析可知，TARGET_PRODUCT=fs100[plain] 34 # the variant -- the set of files that are included for a build 35 ifeq ($(strip $(TARGET_BUILD_VARIANT)),) 36 TARGET_BUILD_VARIANT := eng 37 endif 38 39 # Read the product specs so we an get TARGET_DEVICE and other 40 # variables that we need in order to locate the output files. 41 include $(BUILD_SYSTEM)/product_config.mk 34 # the variant -- the set of files that are included for a build 35 ifeq ($(strip $(TARGET_BUILD_VARIANT)),) 36 TARGET_BUILD_VARIANT := eng 37 endif 38 39 # Read the product specs so we an get TARGET_DEVICE and other 40 # variables that we need in order to locate the output files. 41 include $(BUILD_SYSTEM)/product_config.mk在41行又包含了product_config.mk文件，等会我们再分析它，先看下面的 [plain] 148 # --------------------------------------------------------------- 149 # figure out the output directories 150 151 ifeq (,$(strip $(OUT_DIR))) 152 OUT_DIR := $(TOPDIR)out 153 endif 154 155 DEBUG_OUT_DIR := $(OUT_DIR)/debug 156 157 # Move the host or target under the debug/ directory 158 # if necessary. 159 TARGET_OUT_ROOT_release := $(OUT_DIR)/target 160 TARGET_OUT_ROOT_debug := $(DEBUG_OUT_DIR)/target 161 TARGET_OUT_ROOT := $(TARGET_OUT_ROOT_$(TARGET_BUILD_TYPE)) 162 ... 184 PRODUCT_OUT := $(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE) 187 188 HOST_OUT_EXECUTABLES:= $(HOST_OUT)/bin 189 HOST_OUT_SHARED_LIBRARIES:= $(HOST_OUT)/lib 190 HOST_OUT_JAVA_LIBRARIES:= $(HOST_OUT)/framework 191 HOST_OUT_SDK_ADDON := $(HOST_OUT)/sdk_addon ... 200 TARGET_OUT_INTERMEDIATES := $(PRODUCT_OUT)/obj 201 TARGET_OUT_HEADERS:= $(TARGET_OUT_INTERMEDIATES)/include 202 TARGET_OUT_INTERMEDIATE_LIBRARIES := $(TARGET_OUT_INTERMEDIATES)/lib 203 TARGET_OUT_COMMON_INTERMEDIATES := $(TARGET_COMMON_OUT_ROOT)/obj 204 205 TARGET_OUT := $(PRODUCT_OUT)/system 206 TARGET_OUT_EXECUTABLES:= $(TARGET_OUT)/bin 207 TARGET_OUT_OPTIONAL_EXECUTABLES:= $(TARGET_OUT)/xbin 208 TARGET_OUT_SHARED_LIBRARIES:= $(TARGET_OUT)/lib 209 TARGET_OUT_JAVA_LIBRARIES:= $(TARGET_OUT)/framework 210 TARGET_OUT_APPS:= $(TARGET_OUT)/app 211 TARGET_OUT_KEYLAYOUT := $(TARGET_OUT)/usr/keylayout 212 TARGET_OUT_KEYCHARS := $(TARGET_OUT)/usr/keychars 213 TARGET_OUT_ETC := $(TARGET_OUT)/etc 214 TARGET_OUT_STATIC_LIBRARIES:= $(TARGET_OUT_INTERMEDIATES)/lib 215 TARGET_OUT_NOTICE_FILES:=$(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES 216 217 TARGET_OUT_DATA := $(PRODUCT_OUT)/data 218 TARGET_OUT_DATA_EXECUTABLES:= $(TARGET_OUT_EXECUTABLES) 219 TARGET_OUT_DATA_SHARED_LIBRARIES:= $(TARGET_OUT_SHARED_LIBRARIES) 220 TARGET_OUT_DATA_JAVA_LIBRARIES:= $(TARGET_OUT_JAVA_LIBRARIES) 221 TARGET_OUT_DATA_APPS:= $(TARGET_OUT_DATA)/app 222 TARGET_OUT_DATA_KEYLAYOUT := $(TARGET_OUT_KEYLAYOUT) 223 TARGET_OUT_DATA_KEYCHARS := $(TARGET_OUT_KEYCHARS) 224 TARGET_OUT_DATA_ETC := $(TARGET_OUT_ETC) 225 TARGET_OUT_DATA_STATIC_LIBRARIES:= $(TARGET_OUT_STATIC_LIBRARIES) 226 227 TARGET_OUT_UNSTRIPPED := $(PRODUCT_OUT)/symbols 228 TARGET_OUT_EXECUTABLES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/bin 229 TARGET_OUT_SHARED_LIBRARIES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/lib 230 TARGET_ROOT_OUT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED) 231 TARGET_ROOT_OUT_SBIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/sbin 232 TARGET_ROOT_OUT_BIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/bin 233 234 TARGET_ROOT_OUT := $(PRODUCT_OUT)/root 235 TARGET_ROOT_OUT_BIN := $(TARGET_ROOT_OUT)/bin 236 TARGET_ROOT_OUT_SBIN := $(TARGET_ROOT_OUT)/sbin 237 TARGET_ROOT_OUT_ETC := $(TARGET_ROOT_OUT)/etc 238 TARGET_ROOT_OUT_USR := $(TARGET_ROOT_OUT)/usr 239 240 TARGET_RECOVERY_OUT := $(PRODUCT_OUT)/recovery 241 TARGET_RECOVERY_ROOT_OUT := $(TARGET_RECOVERY_OUT)/root 242 243 TARGET_SYSLOADER_OUT := $(PRODUCT_OUT)/sysloader 244 TARGET_SYSLOADER_ROOT_OUT := $(TARGET_SYSLOADER_OUT)/root 245 TARGET_SYSLOADER_SYSTEM_OUT := $(TARGET_SYSLOADER_OUT)/root/system 246 247 TARGET_INSTALLER_OUT := $(PRODUCT_OUT)/installer 248 TARGET_INSTALLER_DATA_OUT := $(TARGET_INSTALLER_OUT)/data 249 TARGET_INSTALLER_ROOT_OUT := $(TARGET_INSTALLER_OUT)/root 250 TARGET_INSTALLER_SYSTEM_OUT := $(TARGET_INSTALLER_OUT)/root/system 148 # ---------------------------------------------------------------149 # figure out the output directories150151 ifeq (,$(strip $(OUT_DIR)))152 OUT_DIR := $(TOPDIR)out153 endif154155 DEBUG_OUT_DIR := $(OUT_DIR)/debug156157 # Move the host or target under the debug/ directory158 # if necessary.159 TARGET_OUT_ROOT_release := $(OUT_DIR)/target160 TARGET_OUT_ROOT_debug := $(DEBUG_OUT_DIR)/target161 TARGET_OUT_ROOT := $(TARGET_OUT_ROOT_$(TARGET_BUILD_TYPE))162...184 PRODUCT_OUT := $(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE)187188 HOST_OUT_EXECUTABLES:= $(HOST_OUT)/bin189 HOST_OUT_SHARED_LIBRARIES:= $(HOST_OUT)/lib190 HOST_OUT_JAVA_LIBRARIES:= $(HOST_OUT)/framework191 HOST_OUT_SDK_ADDON := $(HOST_OUT)/sdk_addon...200 TARGET_OUT_INTERMEDIATES := $(PRODUCT_OUT)/obj201 TARGET_OUT_HEADERS:= $(TARGET_OUT_INTERMEDIATES)/include202 TARGET_OUT_INTERMEDIATE_LIBRARIES := $(TARGET_OUT_INTERMEDIATES)/lib203 TARGET_OUT_COMMON_INTERMEDIATES := $(TARGET_COMMON_OUT_ROOT)/obj204205 TARGET_OUT := $(PRODUCT_OUT)/system206 TARGET_OUT_EXECUTABLES:= $(TARGET_OUT)/bin207 TARGET_OUT_OPTIONAL_EXECUTABLES:= $(TARGET_OUT)/xbin208 TARGET_OUT_SHARED_LIBRARIES:= $(TARGET_OUT)/lib209 TARGET_OUT_JAVA_LIBRARIES:= $(TARGET_OUT)/framework210 TARGET_OUT_APPS:= $(TARGET_OUT)/app211 TARGET_OUT_KEYLAYOUT := $(TARGET_OUT)/usr/keylayout212 TARGET_OUT_KEYCHARS := $(TARGET_OUT)/usr/keychars213 TARGET_OUT_ETC := $(TARGET_OUT)/etc214 TARGET_OUT_STATIC_LIBRARIES:= $(TARGET_OUT_INTERMEDIATES)/lib215 TARGET_OUT_NOTICE_FILES:=$(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES216217 TARGET_OUT_DATA := $(PRODUCT_OUT)/data218 TARGET_OUT_DATA_EXECUTABLES:= $(TARGET_OUT_EXECUTABLES)219 TARGET_OUT_DATA_SHARED_LIBRARIES:= $(TARGET_OUT_SHARED_LIBRARIES)220 TARGET_OUT_DATA_JAVA_LIBRARIES:= $(TARGET_OUT_JAVA_LIBRARIES)221 TARGET_OUT_DATA_APPS:= $(TARGET_OUT_DATA)/app222 TARGET_OUT_DATA_KEYLAYOUT := $(TARGET_OUT_KEYLAYOUT)223 TARGET_OUT_DATA_KEYCHARS := $(TARGET_OUT_KEYCHARS)224 TARGET_OUT_DATA_ETC := $(TARGET_OUT_ETC)225 TARGET_OUT_DATA_STATIC_LIBRARIES:= $(TARGET_OUT_STATIC_LIBRARIES)226227 TARGET_OUT_UNSTRIPPED := $(PRODUCT_OUT)/symbols228 TARGET_OUT_EXECUTABLES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/bin229 TARGET_OUT_SHARED_LIBRARIES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/lib230 TARGET_ROOT_OUT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)231 TARGET_ROOT_OUT_SBIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/sbin232 TARGET_ROOT_OUT_BIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/bin233234 TARGET_ROOT_OUT := $(PRODUCT_OUT)/root235 TARGET_ROOT_OUT_BIN := $(TARGET_ROOT_OUT)/bin236 TARGET_ROOT_OUT_SBIN := $(TARGET_ROOT_OUT)/sbin237 TARGET_ROOT_OUT_ETC := $(TARGET_ROOT_OUT)/etc238 TARGET_ROOT_OUT_USR := $(TARGET_ROOT_OUT)/usr239240 TARGET_RECOVERY_OUT := $(PRODUCT_OUT)/recovery241 TARGET_RECOVERY_ROOT_OUT := $(TARGET_RECOVERY_OUT)/root242243 TARGET_SYSLOADER_OUT := $(PRODUCT_OUT)/sysloader244 TARGET_SYSLOADER_ROOT_OUT := $(TARGET_SYSLOADER_OUT)/root245 TARGET_SYSLOADER_SYSTEM_OUT := $(TARGET_SYSLOADER_OUT)/root/system246247 TARGET_INSTALLER_OUT := $(PRODUCT_OUT)/installer248 TARGET_INSTALLER_DATA_OUT := $(TARGET_INSTALLER_OUT)/data249 TARGET_INSTALLER_ROOT_OUT := $(TARGET_INSTALLER_OUT)/root250 TARGET_INSTALLER_SYSTEM_OUT := $(TARGET_INSTALLER_OUT)/root/system上面的代码是指定了目标输出代码的位置和主机输出代码的位置，重要的几个如下： [plain] PRODUCT_OUT = 这个的结果要根据product_config.mk文件内容来决定，其实是out/target/product/fs100/ TARGET_OUT = $(PRODUCT_OUT)/system TARGET_OUT_EXECUTABLES = $(PRODUCT_OUT)/system/bin TARGET_OUT_SHARED_LIBRARIES = $(PRODUCT_OUT)/system/lib TARGET_OUT_JAVA_LIBRARIES = $(PRODUCT_OUT)/system/framework TARGET_OUT_APPS = $(PRODUCT_OUT)/system/app TARGET_OUT_ETC = $(PRODUCT_OUT)/system/etc TARGET_OUT_STATIC_LIBRARIES = $(PRODUCT_OUT)/obj/lib TARGET_OUT_DATA = $(PRODUCT_OUT)/data TARGET_OUT_DATA_APPS = $(PRODUCT_OUT)/data/app TARGET_ROOT_OUT = $(PRODUCT_OUT)/root TARGET_ROOT_OUT_BIN = $(PRODUCT_OUT)/bin TARGET_ROOT_OUT_SBIN = $(PRODUCT_OUT)/system/sbin TARGET_ROOT_OUT_ETC = $(PRODUCT_OUT)/system/etc TARGET_ROOT_OUT_USR = $(PRODUCT_OUT)/system/usr PRODUCT_OUT = 这个的结果要根据product_config.mk文件内容来决定，其实是out/target/product/fs100/TARGET_OUT = $(PRODUCT_OUT)/systemTARGET_OUT_EXECUTABLES = $(PRODUCT_OUT)/system/binTARGET_OUT_SHARED_LIBRARIES = $(PRODUCT_OUT)/system/libTARGET_OUT_JAVA_LIBRARIES = $(PRODUCT_OUT)/system/frameworkTARGET_OUT_APPS = $(PRODUCT_OUT)/system/appTARGET_OUT_ETC = $(PRODUCT_OUT)/system/etcTARGET_OUT_STATIC_LIBRARIES = $(PRODUCT_OUT)/obj/libTARGET_OUT_DATA = $(PRODUCT_OUT)/dataTARGET_OUT_DATA_APPS = $(PRODUCT_OUT)/data/appTARGET_ROOT_OUT = $(PRODUCT_OUT)/rootTARGET_ROOT_OUT_BIN = $(PRODUCT_OUT)/binTARGET_ROOT_OUT_SBIN = $(PRODUCT_OUT)/system/sbinTARGET_ROOT_OUT_ETC = $(PRODUCT_OUT)/system/etcTARGET_ROOT_OUT_USR = $(PRODUCT_OUT)/system/usr 总结下： envsetup.mk文件主要包含了product_config.mk文件，然后指定了编译时要输出的所有文件的OUT目录。 4. build/core/product_config.mk [plain] 157 include $(BUILD_SYSTEM)/product.mk ... 160 # Read in all of the product definitions specified by the AndroidProducts.mk 161 # files in the tree. 162 # 163 #TODO: when we start allowing direct pointers to product files, 164 # guarantee that they're in this list. 165 $(call import-products, $(get-all-product-makefiles)) 166 $(check-all-products) ... 170 # Convert a short name like "sooner" into the path to the product 171 # file defining that product. 172 # 173 INTERNAL_PRODUCT := $(call resolve-short-product-name, $(TARGET_PRODUCT)) ... 176 # Find the device that this product maps to. 177 TARGET_DEVICE := $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEVICE) 157 include $(BUILD_SYSTEM)/product.mk...160 # Read in all of the product definitions specified by the AndroidProducts.mk161 # files in the tree.162 #163 #TODO: when we start allowing direct pointers to product files,164 # guarantee that they're in this list.165 $(call import-products, $(get-all-product-makefiles))166 $(check-all-products)...170 # Convert a short name like "sooner" into the path to the product171 # file defining that product.172 #173 INTERNAL_PRODUCT := $(call resolve-short-product-name, $(TARGET_PRODUCT))...176 # Find the device that this product maps to.177 TARGET_DEVICE := $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_DEVICE)157行，我靠，又包含了product.mk文件 165行，调用函数import-products, $(get-all-product-makefiles)，这儿我们看上面的注释： Read in all of the product definitions specified by the AndroidProducts.mk files in the tree. TODO: when we start allowing direct pointers to product files, guarantee that they're in this list. 意思是说：读取指定的目录下所有的AndrodProducts.mk文件中定义的产品信息 其实get-all-product-makefiles返回所有的产品文件xxx.mk import-products函数去验证这些产品配置文件是否都包含有必须的配置信息，细节后面分析。 173行调用了resolve-short-product-name函数，它将返回TARGET_PRODUCT产品的配置文件目录，并赋给INTERNAL_PRODUCT 也就是说： INTERNAL_PRODUCT = vendor/farsight/products/fs100.mk TARGET_DEVICE = fs100 如果调试看其结果，可以在167行，将#$(dump-product)取消注释 然后在175行添加： $(info $(INTERNAL_PRODUCT)) 在178行添加： $(info $(TARGET_DEVICE ))，查看调试结果。 总结一下： product_config.mk主要读取vendor目录下不同厂商自己定义的AndrodProducts.mk文件，从该文件里取得所有产品的配置文件，然后再根据lunch选择的编译项TARGET_PRODUCT，找到与之对应的配置文件，然后设置TARGET_DEVICE变量，用于后续编译。 5. build/core/product.mk [plain] 17 # 18 # Functions for including AndroidProducts.mk files 19 # 20 21 # 22 # Returns the list of all AndroidProducts.mk files. 23 # $(call ) isn't necessary. 24 # 25 define <strong>_find-android-products-files</strong> 26 $(shell test -d vendor && find vendor -maxdepth 6 -name AndroidProducts.mk) \ 27 $(SRC_TARGET_DIR)/product/AndroidProducts.mk 28 endef 29 30 # 31 # Returns the sorted concatenation of all PRODUCT_MAKEFILES 32 # variables set in all AndroidProducts.mk files. 33 # $(call ) isn't necessary. 34 # 35 define <strong>get-all-product-makefiles</strong> 36 $(sort \ 37 $(foreach f,$(_find-android-products-files), \ 38 $(eval PRODUCT_MAKEFILES :=) \ 39 $(eval LOCAL_DIR := $(patsubst %/,%,$(dir $(f)))) \ 40 $(eval include $(f)) \ 41 $(PRODUCT_MAKEFILES) \ 42 ) \ 43 $(eval PRODUCT_MAKEFILES :=) \ 44 $(eval LOCAL_DIR :=) \ 45 ) 46 endef 17 # 18 # Functions for including AndroidProducts.mk files 19 # 20 21 # 22 # Returns the list of all AndroidProducts.mk files. 23 # $(call ) isn't necessary. 24 # 25 define <strong>_find-android-products-files</strong> 26 $(shell test -d vendor && find vendor -maxdepth 6 -name AndroidProducts.mk) \ 27 $(SRC_TARGET_DIR)/product/AndroidProducts.mk 28 endef 29 30 # 31 # Returns the sorted concatenation of all PRODUCT_MAKEFILES 32 # variables set in all AndroidProducts.mk files. 33 # $(call ) isn't necessary. 34 # 35 define <strong>get-all-product-makefiles</strong> 36 $(sort \ 37 $(foreach f,$(_find-android-products-files), \ 38 $(eval PRODUCT_MAKEFILES :=) \ 39 $(eval LOCAL_DIR := $(patsubst %/,%,$(dir $(f)))) \ 40 $(eval include $(f)) \ 41 $(PRODUCT_MAKEFILES) \ 42 ) \ 43 $(eval PRODUCT_MAKEFILES :=) \ 44 $(eval LOCAL_DIR :=) \ 45 ) 46 endef通过注释可知，本文件中主要是一些用来处理AndroidProduct.mk的函数_find-android-products-files: 用来获得vendor目录下，所有名字为AndroidProduct.mk的文件列表。get-all-product-makefiles： 用来获得所有AndroidProduct.mk文件里定义的PRODUCT_MAKEFILES的值（其实是产品文件路径名）。 在vendor目录下，每个公司目录下都会存在一个AndroidProduct.mk文件，这个文件是用来定义这个公司的产品列表，每个产品用<product_name>.mk来表示如Android给的示例： [plain] vendor/sample/products/AndroidProduct.mk vendor/sample/products/AndroidProduct.mk其内容如下： [plain] 1 # 2 # This file should set PRODUCT_MAKEFILES to a list of product makefiles 3 # to expose to the build system. LOCAL_DIR will already be set to 4 # the directory containing this file. 5 # 6 # This file may not rely on the value of any variable other than 7 # LOCAL_DIR; do not use any conditionals, and do not look up the 8 # value of any variable that isn't set in this file or in a file that 9 # it includes. 10 # 11 12 PRODUCT_MAKEFILES := \ 13 $(LOCAL_DIR)/sample_addon.mk 1 # 2 # This file should set PRODUCT_MAKEFILES to a list of product makefiles 3 # to expose to the build system. LOCAL_DIR will already be set to 4 # the directory containing this file. 5 # 6 # This file may not rely on the value of any variable other than 7 # LOCAL_DIR; do not use any conditionals, and do not look up the 8 # value of any variable that isn't set in this file or in a file that 9 # it includes. 10 # 11 12 PRODUCT_MAKEFILES := \ 13 $(LOCAL_DIR)/sample_addon.mk里面只定义了一个产品配置文件，即当前目录下的sample_addon.mk：[plain] 1 # List of apps and optional libraries (Java and native) to put in the add-on system image. 2 PRODUCT_PACKAGES := \ 3 PlatformLibraryClient \ 4 com.example.android.platform_library \ 5 libplatform_library_jni 1 # List of apps and optional libraries (Java and native) to put in the add-on system image. 2 PRODUCT_PACKAGES := \ 3 PlatformLibraryClient \ 4 com.example.android.platform_library \ 5 libplatform_library_jni上述文件里定义了产品相关个性化信息，如，PRODUCT_PACKAGES表示要在当前产品里添加一些安装包。由此可见，get-all-product-makefiles函数，其实就是返回了当前公司里全部的产品对应的mk文件列表。 总结： 如果用户想个性定制自己的产品，应该有以下流程，包含上一节内容： 1. 创建公司目录 #mkdir vendor/farsight 2. 创建一个vendorsetup.sh文件，将当前产品编译项添加到lunch里，让lunch能找到用户个性定制编译项 #echo "add_lunch_combo fs100-eng" > vendor/farsight/vendorsetup.sh 3. 仿着Android示例代码，在公司目录下创建products目录 #mkdir -p vendor/farsight/products 4. 仿着Android示例代码，在products目录下创建两个mk文件 #touch vendor/farsight/products/AndroidProduct.mk vendor/farsight/products/fs100.mk 在AndroidProduct.mk里添加如下内容： [plain] PRODUCT_MAKEFILES := $(LOCAL_DIR)/fs100.mk PRODUCT_MAKEFILES := $(LOCAL_DIR)/fs100.mk表示只有一个产品fs100，它对应的配置文件在当前目录下的fs100.mk。 5. 在产品配置文件里添加最基本信息 [plain] 1 2 PRODUCT_PACKAGES := \ 3 IM \ 4 VoiceDialer 5 6 $(call inherit-product, build/target/product/generic.mk) ##从某一默认配置开始派生余下内容参考派生起点 7 8 # Overrides 9 PRODUCT_MANUFACTURER := farsight 10 PRODUCT_NAME := fs100 11 PRODUCT_DEVICE := fs100 摘自 mr_raptor的专栏 |
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