android NDK編譯多個so檔案

android編譯系統的makefile檔案Android.mk寫法如下

(1)Android.mk檔案首先需要指定LOCAL_PATH變數，用於尋找源檔案。由於一般情況下

Android.mk和需要編譯的源檔案在同一目錄下，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變數定義成本檔案所在目錄路徑。

(2)Android.mk中可以定義多個編譯模組，每個編譯模組都是以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為你清除除LOCAL_PATH以外的所有LOCAL_XXX變數，

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式

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

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)  模組一

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)  模組一編譯成靜態庫

include $(CLEAR_VARS)  模組二

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) 模組二編譯成靜態庫

include $(CLEAR_VARS) 模組三

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) 模組三編譯成動態庫

(4)編譯一個應用程式(APK)

  LOCAL_PATH := $(call my-dir)

  include $(CLEAR_VARS)

  # Build all java files in the java subdirectory-->直譯（建立在java子目錄中的所有Java檔案）

  LOCAL_SRC_FILES := $(call all-subdir-java-files)

  # Name of the APK to build-->直譯（建立APK的名稱）

  LOCAL_PACKAGE_NAME := LocalPackage

  # Tell it to build an APK-->直譯（告訴它來建立一個APK）

  include $(BUILD_PACKAGE)

(5)編譯一個依賴於靜態Java庫(static.jar)的應用程式

  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)編譯一個需要用平台的key簽名的應用程式

  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前面的應用程式

  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)添加一個先行編譯應用程式

  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)

(10)Android.mk的編譯模組中間可以定義相關的編譯內容，也就是指定相關的變數如下：

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檔案中編譯應用程式(BUILD_PACKAGE)時設定此變數，表示資源檔，

                  通常會定義成LOCAL_ASSET_FILES += $(call find-subdir-assets)

LOCAL_BUILT_MODULE_STEM  

LOCAL_C_INCLUDES 額外的C/C++編譯標頭檔路徑，用LOCAL_PATH表示本檔案所在目錄

                 舉例如下：

                 LOCAL_C_INCLUDES += extlibs/zlib-1.2.3

                 LOCAL_C_INCLUDES += $(LOCAL_PATH)/src

LOCAL_CC 指定C編譯器

LOCAL_CERTIFICATE  簽名認證

LOCAL_CFLAGS 為C/C++編譯器定義額外的標誌(如宏定義)，舉例：LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1

LOCAL_CLASSPATH

LOCAL_COMPRESS_MODULE_SYMBOLS

LOCAL_COPY_HEADERS install應用程式時需要複製的標頭檔，必須同時定義LOCAL_COPY_HEADERS_TO

LOCAL_COPY_HEADERS_TO install應用程式時複製標頭檔的目的路徑

LOCAL_CPP_EXTENSION 如果你的C++檔案不是以cpp為檔案尾碼，你可以通過LOCAL_CPP_EXTENSION指定C++檔案尾碼名

                    如：LOCAL_CPP_EXTENSION := .cc

                    注意統一模組中C++檔案尾碼必須保持一致。

LOCAL_CPPFLAGS 傳遞額外的標誌給C++編譯器，如：LOCAL_CPPFLAGS += -ffriend-injection

LOCAL_CXX 指定C++編譯器

LOCAL_DX_FLAGS

LOCAL_EXPORT_PACKAGE_RESOURCES

LOCAL_FORCE_STATIC_EXECUTABLE 如果編譯的可執行程式要進行靜態連結(執行時不依賴於任何動態庫)，則設定LOCAL_FORCE_STATIC_EXECUTABLE:=true

                              目前只有libc有靜態庫形式，這個只有檔案系統中/sbin目錄下的應用程式會用到，這個目錄下的應用程式在運行時通常

                              檔案系統的其它部分還沒有載入，所以必須進行靜態連結。

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 編譯java應用程式和庫的時候指定包含的java類庫，目前有core和framework兩種

                     多數情況下定義成：LOCAL_JAVA_LIBRARIES := core framework

                     注意LOCAL_JAVA_LIBRARIES不是必須的，而且編譯APK時不允許定義(系統會自動添加)

LOCAL_JAVA_RESOURCE_DIRS

LOCAL_JAVA_RESOURCE_FILES

LOCAL_JNI_SHARED_LIBRARIES

LOCAL_LDFLAGS 傳遞額外的參數給連接器(務必注意參數的順序)

LOCAL_LDLIBS 為可執行程式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

LOCAL_MODULE 產生的模組的名稱(注意應用程式名稱用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)

LOCAL_MODULE_PATH 產生模組的路徑

LOCAL_MODULE_STEM

LOCAL_MODULE_TAGS 產生模組的標記

LOCAL_NO_DEFAULT_COMPILER_FLAGS

LOCAL_NO_EMMA_COMPILE

LOCAL_NO_EMMA_INSTRUMENT

LOCAL_NO_STANDARD_LIBRARIES

LOCAL_OVERRIDES_PACKAGES

LOCAL_PACKAGE_NAME APK應用程式的名稱

LOCAL_POST_PROCESS_COMMAND

LOCAL_PREBUILT_EXECUTABLES 先行編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用,指定需要複製的可執行檔

LOCAL_PREBUILT_JAVA_LIBRARIES

LOCAL_PREBUILT_LIBS 先行編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用, 指定需要複製的庫.

LOCAL_PREBUILT_OBJ_FILES

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES  

LOCAL_PRELINK_MODULE 是否需要預串連處理(預設需要，用來做動態庫最佳化)

LOCAL_REQUIRED_MODULES 指定模組運行所依賴的模組(模組安裝時將會同步安裝它所依賴的模組)

LOCAL_RESOURCE_DIR

LOCAL_SDK_VERSION

LOCAL_SHARED_LIBRARIES 可連結動態庫

LOCAL_SRC_FILES 編譯源檔案

LOCAL_STATIC_JAVA_LIBRARIES

LOCAL_STATIC_LIBRARIES 可連結靜態庫

LOCAL_UNINSTALLABLE_MODULE

LOCAL_UNSTRIPPED_PATH

LOCAL_WHOLE_STATIC_LIBRARIES 指定模組所需要載入的完整靜態庫(這些精通庫在連結是不允許連結器刪除其中無用的代碼)

LOCAL_YACCFLAGS

OVERRIDE_BUILT_MODULE_PATH