Android Makefile文件：Android.mk写法

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android编译系统的makefile文件Android.mk写法如下

1.LOCAL_PATH

Android.mk文件首先需要指定LOCAL_PATH变量用于查找源文件。由于一般情况下Android.mk和需要编译的源文件在同一目录下所以定义成如下形式
LOCAL_PATH:=$(call my-dir)
上面的语句的意思是将LOCAL_PATH变量定义成本文件当前的Android.mk所在目录路径。
规定LOCAL_PATH必须放在所有的include $(CLEAR_VARS)之前

2.CLEAR_VARS

Android.mk中可以定义多个编译模块每个编译模块都是以include $(CLEAR_VARS) 开始以 include $(BUILD_XXX) 结束。

include $(CLEAR_VARS)
...
include $(BUILD_XXX)

CLEAR_VARS由编译系统提供是一个编译模块的开始指定让GNUMAKEFILE为你清除除LOCAL_PATH以外的所有LOCAL_XXX变量如LOCAL_MODULELOCAL_SRC_FILESLOCAL_SHARED_LIBRARIESLOCAL_STATIC_LIBRARIES等。
BUILD_XXX描述了编译目标

include $(BUILD_STATIC_LIBRARY)表示编译成目标设备上的静态库(附录1)
include $(BUILD_SHARED_LIBRARY)表示编译成目标设备上的动态库(附录2)
include $(BUILD_EXECUTABLE)表示编译成目标设备上的可执行程序(附录3)
include $(BUILD_HOST_STATIC_LIBRARY)表示编译成主机上的静态库
include $(BUILD_HOST_SHARED_LIBRARY)表示编译成主机上的动态库
include $(BUILD_HOST_EXECUTABLE)表示编译成主机上的可执行文件
include $(BUILD_JAVA_LIBRARY)表示编译成JAVA库
include $(BUILD_STATIC_JAVA_LIBRARY)表示编译成静态JAVA库
include $(BUILD_HOST_JAVA_LIBRARY)表示编译成主机上的JAVA库
include $()BUILD_PACKAGE表示编译成APK程序。

3.例

举例如下(frameworks/base/libs/audioflinger/Android.mk)

LOCAL_PATH:= $(call my-dir)

#-----------------------模块一---------------------
include $(CLEAR_VARS)                    #模块一
ifeq ($(AUDIO_POLICY_TEST),true)         #ifeq ($(CC),gcc)  表示判断表达式与某个值是否相等
    ENABLE_AUDIO_DUMP := true            #这里应该是定义一个标志仅供当前.mk文件使用
endif

#LOCAL_SRC_FILES定义了本模块编译使用的源文件采用的是基于LOCAL_PATH的相对路径
LOCAL_SRC_FILES:= \           
    AudioHardwareGeneric.cpp \
    AudioHardwareStub.cpp \
    AudioHardwareInterface.cpp

#下面这三句是我自己加的    
LOCAL_CFLAGS := -Wall -Wextra -Werror   #gcc的编译选项 如gcc -Wall -Wextra -Werror main.c -o main
#LOCAL_CFLAGS += -DXXX   相当于在  所有源文件  中增加一个宏定义#define XXX
#使用“+=”操作符给变量追加值
LOCAL_CFLAGS += -DSUNDP_FLAG
LOCAL_CFLAGS += -DSUNDPMY_FLAG

#ifeq ($(CC),gcc) 代表判断$(CC)变量是否是“gcc”
#下面这句就是判断ENABLE_AUDIO_DUMP是不是ture
ifeq ($(ENABLE_AUDIO_DUMP),true)
    LOCAL_SRC_FILES += AudioDumpInterface.cpp
    LOCAL_CFLAGS += -DENABLE_AUDIO_DUMP
endif

#表示编译本模块时需要链接的动态库
LOCAL_SHARED_LIBRARIES := \
    libcutils \
    libutils \
    libbinder \
    libmedia \
    libhardware_legacy
    
#strip
#名称去空格函数——strip。 
#功能去掉<string>字串中开头和结尾的空字符。 
#返回返回被去掉空格的字符串值。
#示例 
#$(strip a b c ) 
#把字串“a b c ”去到开头和结尾的空格结果是“a b c”。
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
    LOCAL_CFLAGS += -DGENERIC_AUDIO
endif

#LOCAL_MODULE本模块的模块名也就是说模块一被编译成libaudiointerface.so
LOCAL_MODULE:= libaudiointerface   
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
    LOCAL_SRC_FILES += A2dpAudioInterface.cpp
    LOCAL_SHARED_LIBRARIES += liba2dp
    LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
    #LOCAL_C_INCLUDES本模块需要引用的include文件
    LOCAL_C_INCLUDES += $(call include-path-for, bluez)
endif
include $(BUILD_STATIC_LIBRARY)     #模块一编译成静态库

#-----------------------模块二---------------------
include $(CLEAR_VARS)    #模块二

LOCAL_SRC_FILES:=    \
    AudioPolicyManagerBase.cpp
LOCAL_SHARED_LIBRARIES := \
    libcutils \
    libutils \
    libmedia
    
ifeq ($(TARGET_SIMULATOR),true)
    LOCAL_LDLIBS += -ldl
else
    LOCAL_SHARED_LIBRARIES += libdl
endif

LOCAL_MODULE:= libaudiopolicybase
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
    LOCAL_CFLAGS += -DWITH_A2DP
endif
ifeq ($(AUDIO_POLICY_TEST),true)
    LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif
include $(BUILD_STATIC_LIBRARY)     #模块二编译成静态库

#-----------------------模块二---------------------
include $(CLEAR_VARS)           #模块三
LOCAL_SRC_FILES:=    \
    AudioFlinger.cpp     \
    AudioMixer.cpp.arm   \
    AudioResampler.cpp.arm   \
    AudioResamplerSinc.cpp.arm   \
    AudioResamplerCubic.cpp.arm \
    AudioPolicyService.cpp
LOCAL_SHARED_LIBRARIES := \
    libcutils \
    libutils \
    libbinder \
    libmedia \
    libhardware_legacy
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
    LOCAL_STATIC_LIBRARIES += libaudiointerface libaudiopolicybase
    LOCAL_CFLAGS += -DGENERIC_AUDIO
else
    LOCAL_SHARED_LIBRARIES += libaudio libaudiopolicy
endif

ifeq ($(TARGET_SIMULATOR),true)
    LOCAL_LDLIBS += -ldl
else
    LOCAL_SHARED_LIBRARIES += libdl
endif

LOCAL_MODULE:= libaudioflinger
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
    LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
    LOCAL_SHARED_LIBRARIES += liba2dp
endif

ifeq ($(AUDIO_POLICY_TEST),true)
    LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif

ifeq ($(TARGET_SIMULATOR),true)
    ifeq ($(HOST_OS),linux)
        LOCAL_LDLIBS += -lrt -lpthread
    endif
endif
ifeq ($(BOARD_USE_LVMX),true)
    LOCAL_CFLAGS += -DLVMX
    LOCAL_C_INCLUDES += vendor/nxp
    LOCAL_STATIC_LIBRARIES += liblifevibes
    LOCAL_SHARED_LIBRARIES += liblvmxservice
#   LOCAL_SHARED_LIBRARIES += liblvmxipc
endif
include $(BUILD_SHARED_LIBRARY) #模块三编译成动态库

4.编译一个应用程序(APK)

LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
   
  # Build all java files in the java subdirectory
  LOCAL_SRC_FILES := $(call all-subdir-java-files)
   
  # Name of the APK to build
  LOCAL_PACKAGE_NAME := LocalPackage
   
  # Tell it to build an APK
  include $(BUILD_PACKAGE)

5.编译一个依赖于静态Java库(static.jar)的应用程序

LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
   
  # List of static libraries to include in the package
  LOCAL_STATIC_JAVA_LIBRARIES := static-library
   
  # Build all java files in the java subdirectory
  LOCAL_SRC_FILES := $(call all-subdir-java-files)
   
  # Name of the APK to build
  LOCAL_PACKAGE_NAME := LocalPackage
   
  # Tell it to build an APK
  include $(BUILD_PACKAGE)

6.编译一个需要用平台的key签名的应用程序

LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
   
  # Build all java files in the java subdirectory
  LOCAL_SRC_FILES := $(call all-subdir-java-files)
   
  # Name of the APK to build
  LOCAL_PACKAGE_NAME := LocalPackage
   
  LOCAL_CERTIFICATE := platform
   
  # Tell it to build an APK
  include $(BUILD_PACKAGE)

7.编译一个需要用特定key前面的应用程序

LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
   
  # Build all java files in the java subdirectory
  LOCAL_SRC_FILES := $(call all-subdir-java-files)
   
  # Name of the APK to build
  LOCAL_PACKAGE_NAME := LocalPackage
   
  LOCAL_CERTIFICATE := vendor/example/certs/app
   
  # Tell it to build an APK
  include $(BUILD_PACKAGE)

8.添加一个预编译应用程序

LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
   
  # Module name should match apk name to be installed.
  LOCAL_MODULE := LocalModuleName
  LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
  LOCAL_MODULE_CLASS := APPS
  LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
   
  include $(BUILD_PREBUILT)

9.添加一个静态JAVA库

LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
   
  # Build all java files in the java subdirectory
  LOCAL_SRC_FILES := $(call all-subdir-java-files)
   
  # Any libraries that this library depends on
  LOCAL_JAVA_LIBRARIES := android.test.runner
   
  # The name of the jar file to create
  LOCAL_MODULE := sample
   
  # Build a static jar file.
  include $(BUILD_STATIC_JAVA_LIBRARY)

10.相关的变量

Android.mk的编译模块中间可以定义相关的编译内容也就是指定相关的变量如下
LOCAL_AAPT_FLAGS
LOCAL_ACP_UNAVAILABLE 
LOCAL_ADDITIONAL_JAVA_DIR 
 
LOCAL_AIDL_INCLUDES 
LOCAL_ALLOW_UNDEFINED_SYMBOLS 
LOCAL_ARM_MODE 
LOCAL_ASFLAGS 
LOCAL_ASSET_DIR

LOCAL_ASSET_FILES 在Android.mk文件中编译应用程序(BUILD_PACKAGE)时设置此变量表示资源文件通常会定义成LOCAL_ASSET_FILES += $(call find-subdir-assets)

LOCAL_BUILT_MODULE_STEM

LOCAL_C_INCLUDES 额外的C/C++编译头文件路径用LOCAL_PATH表示本文件所在目录
                 举例如下
                 LOCAL_C_INCLUDES += extlibs/zlib-1.2.3
                 LOCAL_C_INCLUDES += $(LOCAL_PATH)/src

LOCAL_CC 指定C编译器
LOCAL_CERTIFICATE  签名认证
LOCAL_CFLAGS 为C/C++编译器定义额外的标志(如宏定义)举例LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1

LOCAL_CLASSPATH
LOCAL_COMPRESS_MODULE_SYMBOLS
LOCAL_COPY_HEADERS install应用程序时需要复制的头文件必须同时定义LOCAL_COPY_HEADERS_TO

LOCAL_COPY_HEADERS_TO install应用程序时复制头文件的目的路径
LOCAL_CPP_EXTENSION 如果你的C++文件不是以cpp为文件后缀你可以通过LOCAL_CPP_EXTENSION指定C++文件后缀名
                    如LOCAL_CPP_EXTENSION := .cc
                    注意统一模块中C++文件后缀必须保持一致。
LOCAL_CPPFLAGS 传递额外的标志给C++编译器如LOCAL_CPPFLAGS += -ffriend-injection
LOCAL_CXX 指定C++编译器

LOCAL_DX_FLAGS
LOCAL_EXPORT_PACKAGE_RESOURCES
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)则设置LOCAL_FORCE_STATIC_EXECUTABLE:=true
                              目前只有libc有静态库形式这个只有文件系统中/sbin目录下的应用程序会用到这个目录下的应用程序在运行时通常
                              文件系统的其它部分还没有加载所以必须进行静态链接。

LOCAL_GENERATED_SOURCES

LOCAL_INSTRUMENTATION_FOR
LOCAL_INSTRUMENTATION_FOR_PACKAGE_NAME
LOCAL_INTERMEDIATE_SOURCES
LOCAL_INTERMEDIATE_TARGETS
LOCAL_IS_HOST_MODULE
LOCAL_JAR_MANIFEST
LOCAL_JARJAR_RULES
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)

LOCAL_JAVA_RESOURCE_DIRS
LOCAL_JAVA_RESOURCE_FILES
LOCAL_JNI_SHARED_LIBRARIES
LOCAL_LDFLAGS 传递额外的参数给连接器(务必注意参数的顺序)

LOCAL_LDLIBS 为可执行程序或者库的编译指定额外的库指定库以"-lxxx"格式举例
             LOCAL_LDLIBS += -lcurses -lpthread
             LOCAL_LDLIBS += -Wl,-z,origin
 
LOCAL_MODULE 生成的模块的名称(注意应用程序名称用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)
LOCAL_MODULE_PATH 生成模块的路径
 
LOCAL_MODULE_STEM
 
LOCAL_MODULE_TAGS 生成模块的标记 
 
LOCAL_NO_DEFAULT_COMPILER_FLAGS 
LOCAL_NO_EMMA_COMPILE 
LOCAL_NO_EMMA_INSTRUMENT 
LOCAL_NO_STANDARD_LIBRARIES 
LOCAL_OVERRIDES_PACKAGES 
LOCAL_PACKAGE_NAME APK应用程序的名称 
LOCAL_POST_PROCESS_COMMAND
 
LOCAL_PREBUILT_EXECUTABLES 预编译including ( B U I L D P R E B U I L T ) 或者 (BUILD_PREBUILT)或者 (BUILDP​REBUILT)或者(BUILD_HOST_PREBUILT)时所用,指定需要复制的可执行文件
LOCAL_PREBUILT_JAVA_LIBRARIES 
LOCAL_PREBUILT_LIBS 预编译including ( B U I L D P R E B U I L T ) 或者 (BUILD_PREBUILT)或者 (BUILDP​REBUILT)或者(BUILD_HOST_PREBUILT)时所用, 指定需要复制的库.
LOCAL_PREBUILT_OBJ_FILES 
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES  
 
LOCAL_PRELINK_MODULE 是否需要预连接处理(默认需要用来做动态库优化)
LOCAL_REQUIRED_MODULES 指定模块运行所依赖的模块(模块安装时将会同步安装它所依赖的模块)
 
LOCAL_RESOURCE_DIR
LOCAL_SDK_VERSION
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_UNSTRIPPED_PATH
 
LOCAL_WHOLE_STATIC_LIBRARIES 指定模块所需要载入的完整静态库(这些精通库在链接是不允许链接器删除其中无用的代码)
 
LOCAL_YACCFLAGS
 
OVERRIDE_BUILT_MODULE_PATH

阿里云国内75折 回扣 微信号：monov8
阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6
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