android Makefile and main.mk

路径：build/core/

android make 系统总共分为四层

arch
board
device
product

在各个字android.mk文件中引用的定义都存放在./build/core/下！

比如android.mk中的

include (CLEARVARS)它对应的是在./build/core/config.mk中的CLEARVARS:=(BUILD_SYSTEM)/clear_vars.mk

include (BUILDPACKAGE)它对应的是在./build/core/config.mk中的BUILDPACKAGE:=(BUILD_SYSTEM)/package.mk

main.mk中的模块

.PHONY: files
.PHONY: ramdisk
.PHONY: systemimage
.PHONY: userdataimage
.PHONY: bootimage
.PHONY: droidcore
.PHONY: apps_only
.PHONY: sdk
.PHONY: clean
.PHONY: clobber
.PHONY: modules
.PHONY: showcommands
.PHONY: nothing
......

在一个makefile文件中，可以一次性的make出多个目标！每个独立的目标其结构大体如下

LOCAL_PATH:=(callmy−dir)//获取当前目录include(CLEAR_VARS) //make系统为子模块定义了很多的私有变量，这个调用是为了初始化所有的私有变量

…

//里面的内容根据不同的需要会出现不同的LOCAL变量

…

include $(BUILD_XXX) //执行编译任务

编译APK

LOCAL_SRC_FILES:=$(call all-subdir-java-files)
LOCAL_PACKAGE_NAME:=packageName
include $(BUILD_PACKAGE)

编译依赖静态java库的应用程序

LOCAL_STATIC_JAVA_LIBRARIES:=static-library
LOCAL_SRC_FILES:=$(call all-subdir-java-files)
LOCAL_PACKAGE_NAME:=packageName
include $(BUILD_PACKAGE)

编译一个需要用平台key签名的应用程序

LOCAL_SRC_FILES:=$(call all-subdir-java-files)
LOCAL_PACKAGE_NAME:=packageName
LOCAL_CERTIFICATE:=platform
include $(BUILD_PACKAGE)

编译一个需要特定key的应用程序

LOCAL_SRC_FILES := $(call all-subdir-java-files)
LOCAL_PACKAGE_NAME := LocalPackage
LOCAL_CERTIFICATE := vendor/example/certs/app
include $(BUILD_PACKAGE)

添加一个预编译应用程序

LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
LOCAL_MODULE := LocalModuleName
LOCAL_MODULE_CLASS := APPS
LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
include $(BUILD_PREBUILT)

LOCAL_SRC_FILES := $(call all-subdir-java-files)
LOCAL_JAVA_LIBRARIES := android.test.runner
LOCAL_MODULE := sample
include $(BUILD_STATIC_JAVA_LIBRARY)

常用的mk分类

Android.mk 用来编译模块或者apk的，module对应native code，package对应于java

AndroidProducts.mk 设置product，设置系统包含了那些应用

target_-.mk，host_-.mk，-.mk 针对不同的系统和CPU架框进行设置

BoardConfig.mk 设置主板用的，比如driver的选择

./build/core/Makefile 定义了image是如何生成的

frameworks/base/core/java 扩展SDK时，可以向里面添加自己的类

make参数

build/envsetup.sh 可以设置环境，运行之后会支持mm命令，使make支持只编译一个模块

buildspec.mk

用户也可以通过mm来编译指定模块，或者通过make clean-module_name来删除指定模块。

make ONE_SHOT_MAKEFILE=

LOCAL_AAPT_FLAGS
LOCAL_ACP_UNAVAILABL
LOCAL_ADDITIONAL_JAVA_DIR
LOCAL_AIDL_INCLUDES
LOCAL_ALLOW_UNDEFINED_SYMBOLS
LOCAL_ARM_MODE
LOCAL_ASFLAGS
LOCAL_ASSET_DIR
LOCAL_ASSET_FILES 在与BUILD_PACKAGE一起时有效，表示资源文件
LOCAL_BUILT_MODULE_STEM
LOCAL_C_INCLUDES 用来指定外面的头文件路径
LOCAL_CC 可以指定C编译器
LOCAL_JAR_MANIFEST
LOCAL_JARJAR_RULES
LOCAL_JAR_PATH
LOCAL_SHARED_LIBRARIES 可链接动态库
LOCAL_SRC_FILES 编译源文件
LOCAL_STATIC_JAVA_LIBRARIES
LOCAL_STATIC_LIBRARIES 可链接静态库
LOCAL_UNINSTALLABLE_MODULE
LOCAL_WHOLE_STATIC_LIBRARIES 禁止在连接时删除库中的无用代码
LOCAL_FORCE_STATIC_EXECUTABLE 如果编译的可执行程序要进行静态链接(执行时不依赖于任何动态库)
LOCAL_JAVA_LIBRARIES 编译java应用程序和库的时候指定包含的java类库，目前有core和framework两种
多数情况下定义成：LOCAL_JAVA_LIBRARIES := core framework
注意LOCAL_JAVA_LIBRARIES不是必须的，而且编译APK时不允许定义(系统会自动添加)

envsetup.mk主要会读取由envsetup.sh写入环境变量中的一些变量来配置 编译过程中的输出目录

config.mk里面定义了各种module所需要的工具，以及如何来编译各个模块

CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk
BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk
BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk
BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk
BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk
BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk
BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk
BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk
BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk
BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk
BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk
BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk
BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk
BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk
BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk
BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk
BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk
BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk
BUILD_KEY_CHAR_MAP := $(BUILD_SYSTEM)/key_char_map.mk

以上的*.mk中都包含了base_rules.mk

products设置

./build/target/product/AndroidProducts.mk

module设置

native code和java的一些通用方法都在./build/core/definitions.mk中

BUILD_SHARE_xxx等变量在./build/core/config.mk中

Board

./build/target/board/$(TARGET_DEVICE)/BoardConfig.mk
./vendor/*/$(TARGET_DEVICE)/BoardConfig.mk

rules相关

与 LOCAL_MODULE_TAGS相关的定义

include $(BUILD_STATIC_LIBRARY) 编译成静态库
include $(BUILD_SHARED_LIBRARY) 编译成动态库。
include $(BUILD_EXECUTABLE) 编译成可执行程序

常用函数

call my-dir
call all-subdir-java-files
call all-java-files-under
call all-makefiles-under,$(LOCAL_PATH)
call all-clean-step
call import-module,android/native_app_glue
call inherit-product,xxx.mk
call inherit-product-if-exists
call device-test
call include-path-for,libpagemap
call dist-for-goals,dist_files,$(LOCAL_BUILT_MODULE)
call _add-charger-image,$(_img)
call libfilterfw-all-java-files-under,$(1)
call libfilterfw_to_document,$(LOCAL_PATH)
call intermediates-dir-for,EXECUTABLES,$(LOCAL_MODULE,true)
call all-named-subdir-makefiles,$(legacy_modules)
call RM;call MKDIR
call emugl-begin-host-shared-library,libEGL_translator
call emugl-import,libOpenglOsUtils
call emugl-end-module
call emugl-export,LDLIBS,-lGL
cal emugl-export,LDFLAGS,$(GL_COMMON_LINKER_FLAGS)
call emugl-set-shared-library-subpath,hw
call emugl-export,C_INCLUDES,$(intermediates)
call all-makefiles-under,$(LOCAL_PATH) 这个和下面的区别还不清楚
call all-subdis-makefiles 这个是通常出现在整个makefile的尾部，以实现递归调用子目录中的makefile，使整个make系统成为一个树状结构

转载链接：http://shine80769769.blog.163.com/blog/static/1791482452012619105744163/

链接main.mk简单使用http://blog.csdn.net/xiao_yuanjl/article/details/78864134