Android.mk系統介紹

Android.mk語句介紹

 1.LOCAL_C_INCLUDES

LOCAL_C_INCLUDES

額外的C/C++編譯頭文件路徑，用LOCAL_PATH表示本文件所在目錄。舉例如下：

LOCAL_C_INCLUDES += extlibs/zlib-1.2.3
LOCAL_C_INCLUDES += $(LOCAL_PATH)/src

2.LOCAL_CC

<code class="objectivec">LO<span class="hljs-built_in">CAL_CC</span></code>

指定C編譯器

3.LOCAL_CERTIFICATE

LOCAL_CERTIFICATE

簽名認證

4.LOCAL_CFLAGS

LOCAL_CFLAGS

爲 C/C++編譯器定義額外的標誌 (如宏定義 ).舉例:

LOCAL_CFLAGS += -DLIBUTILS _NATIVE=1

5.LOCAL_LDFLAGS

LOCAL_LDFLAGS

傳遞額外的參數給連接器(務必注意參數的順序)

6.LOCAL_LDLIBS

LOCAL_LDLIBS

爲可執行程序或者庫的編譯指定額外的庫，指定庫以"-lxxx"格式.舉例:

LOCAL_LDLIBS += -lcurses -lpthread
LOCAL_LDLIBS += -Wl,-z,origin

7.LOCAL_MODULE

LOCAL_MODULE

生成的模塊的名稱(注意應用程序名稱用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)LOCAL_MODULE_PATH 生成模塊的路徑

8.LOCAL_SHARED_LIBRARIES

LOCAL_SHARED_LIBRARIES

可鏈接動態庫

9.LOCAL_SRC_FILES

LOCAL_SRC_FILES

編譯源文件LOCAL_STATIC_LIBRARIES 可鏈接靜態庫

LOCAL_PATH變量

Android.mk文件首先需要指定LOCAL_PATH變量，用於查找源文件。由於一般情況下Android.mk和需要編譯的源文件在同一目錄下，所以定義成如下形式：

LOCAL_PATH:=$(call my-dir)

上面的語句的意思是將LOCAL_PATH變量定義成本文件所在目錄路徑。

多個編譯模塊

Android.mk中可以定義多個編譯模塊，每個編譯模塊都是以include $(CLEAR_VARS)開始，以include $(BUILD_XXX)結束。

include $(CLEAR_VARS)

CLEAR_VARS由編譯系統提供，指定讓GNU MAKEFILE爲你清除除LOCAL_PATH以外的所有LOCAL_XXX變量，如LOCAL_MODULE，LOCAL_SRC_FILES，LOCAL_SHARED_LIBRARIES，LOCAL_STATIC_LIBRARIES等。

include $(BUILD_STATIC_LIBRARY)

表示編譯成靜態庫

include $(BUILD_SHARED_LIBRARY)

表示編譯成動態庫。

include $(BUILD_EXECUTABLE)

表示編譯成可執行程序

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

1.模塊一編譯成靜態庫

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.模塊二編譯成靜態庫

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//這個來判斷宏的具體值

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

include $(BUILD_STATIC_LIBRARY)

3.模塊三編譯成動態庫

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.編譯一個應用程序(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.編譯一個依賴於靜態Java庫(static.jar)的應用程序

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.編譯一個需要用平臺的key簽名的應用程序

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.編譯一個需要用特定key前面的應用程序

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)添加一個預編譯應用程序

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.添加一個靜態JAVA庫

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)