android.mk文件

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android 编译系统的 makefile 文件 Android.mk 写法如下

(1)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 变量定义成本文件所在目录路径。

(2)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)
CLEAR_VARS 由编译系统提供，指定让 GNU MAKEFILE 为你清除除 LOCAL_PATH 以外的所有 LOCAL_XXX 变量，
如 LOCAL_MODULE ， LOCAL_SRC_FILES ， LOCAL_SHARED_LIBRARIES ， LOCAL_STATIC_LIBRARIES 等。
include $(BUILD_STATIC_LIBRARY) 表示编译成静态库
include $(BUILD_SHARED_LI BRARY) 表示编译成动态库。
include $(BUILD_EXECUTABLE) 表示编译成可执行程序

(3) 举例如下 (frameworks/base/libs/audioflinger/Android.mk) ：
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS) 模块一
ifeq ($(AUDIO_POLICY_TEST),true)
ENABLE_AUDIO_DUMP := true
endif
LOCAL_SRC_FILES:= \
    A udioHardwareGeneric.cpp \
    AudioHardwareStub.cpp \
    AudioHardwareInterface.cpp
ifeq ($(ENABLE_AUDIO_DUMP),true)
LOCAL_SRC_FILES += AudioDumpInterface.cpp
LOCAL_CFLAGS += -DENABLE_AUDIO_DUMP
endif
LOCAL_SHARED_LIBRARIES := \
    libcutils \
    libutils \
    libbinder \
    libmedia \
    libhardware_legacy
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
LOCAL_CFLAGS += -DGENERIC_AUDIO
endif
LOCAL_MODULE:= libaudiointerface
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
LOCAL_SRC_FILES += A2dpAudioInterface.cpp
LOCAL_SHARED_LIBRARIES += liba2dp
LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
LOCAL_C_INCLUDES += $(call include-path-for, bluez)
endif
include $(BUILD_STATIC_LIBRARY) 模块一编译成静态库
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
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_VA RS)

# 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)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_INSTRUME NTATION_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)