Android.mk语句介绍
1.LOCAL_C_INCLUDES
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 += $(LOCAL_PATH)/src
2.LOCAL_CC
LOCAL_CC
指定C编译器
3.LOCAL_CERTIFICATE
LOCAL_CERTIFICATE
签名认证
4.LOCAL_CFLAGS
LOCAL_CFLAGS
为 C/C++编译器定义额外的标志 (如宏定义 ).举例:
LOCAL_CFLAGS += -DLIBUTILS _NATIVE=1
5.LOCAL_LDFLAGS
LOCAL_LDFLAGS
传递额外的参数给连接器(务必注意参数的顺序)
6.LOCAL_LDLIBS
LOCAL_LDLIBS
为可执行程序或者库的编译指定额外的库，指定库以"-lxxx"格式.举例:
LOCAL_LDLIBS += -lcurses -lpthread
LOCAL_LDLIBS += -Wl,-z,origin
7.LOCAL_MODULE
LOCAL_MODULE
生成的模块的名称(注意应用程序名称用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)LOCAL_MODULE_PATH 生成模块的路径
8.LOCAL_SHARED_LIBRARIES
LOCAL_SHARED_LIBRARIES
可链接动态库
9.LOCAL_SRC_FILES
LOCAL_SRC_FILES
编译源文件LOCAL_STATIC_LIBRARIES 可链接静态库
LOCAL_PATH变量
Android.mk文件首先需要指定LOCAL_PATH变量，用于查找源文件。由于一般情况下Android.mk和需要编译的源文件在同一目录下，所以定义成如下形式：
LOCAL_PATH:=$(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。
多个编译模块
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_LIBRARY)
表示编译成动态库。
include $(BUILD_EXECUTABLE)
表示编译成可执行程序
举例如下(frameworks/base/libs/audioflinger/Android.mk)：
1.模块一编译成静态库
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
ifeq ($(AUDIO_POLICY_TEST),true)
ENABLE_AUDIO_DUMP := true
endif
LOCAL_SRC_FILES:= \
AudioHardwareGeneric.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)
2.模块二编译成静态库
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
AudioPolicyManagerBase.cpp
LOCAL_SHARED_LIBRARIES := \
libcutils \
libutils \
libmedia
ifeq ($(TARGET_SIMULATOR),true)
LOCAL_LDLIBS += -ldl
else
LOCAL_SHARED_LIBRARIES += libdl
endif
LOCAL_MODULE:= libaudiopolicybase
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
LOCAL_CFLAGS += -DWITH_A2DP
endif//这个来判断宏的具体值
ifeq ($(AUDIO_POLICY_TEST),true)
LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif
include $(BUILD_STATIC_LIBRARY)
3.模块三编译成动态库
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
AudioFlinger.cpp \
AudioMixer.cpp.arm \
AudioResampler.cpp.arm \
AudioResamplerSinc.cpp.arm \
AudioResamplerCubic.cpp.arm \
AudioPolicyService.cpp
LOCAL_SHARED_LIBRARIES := \
libcutils \
libutils \
libbinder \
libmedia \
libhardware_legacy
ifeq ($(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)
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)
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