build/core/clear_vars.mk

Clear out values of all variables used by rule templates

清除LOCAL变量，每个模块的Android.mk，一般会先包含该文件

变量定义主要出现在base_rules.mk，config.mk，definitions.mk

LOCAL_MODULE

LOCAL_MODULE表示模块的名称

   LOCAL_MODULE将在每个模块的makefile里定义，如果未定义，编译系统会报错

LOCAL_MODULE_PATH

表示模块编译结果将要存放的目录

    recovery模块的Android.mk里有

    LOCAL_MODULE := nandroid-md5.sh 

    LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin 

    说明：nandroid-md5.sh 将存放于out/Cyanogenmod/target/product/m7ul/recovery/root/sbin

    如果模块的Android.mk里未定义LOCAL_MODULE_PATH

    那么LOCAL_MODULE_PATH := $($(my_prefix)OUT$(partition_tag)_$(LOCAL_MODULE_CLASS))

    在recovery模块里recovery可执行文件相关变量如下：

    比如my_prefix为TARGET_，partition_tag为空,LOCAL_MODULE_CLASS为EXECUTABLES

    那么LOCAL_MODULE_PATH为$(TARGET_OUT_EXECUTABLES)，

    值应该为

    out/Cyanogenmod/target/product/m7ul/system/bin

LOCAL_MODULE_STEM

表示编译链接后的目标文件的文件名，不带后缀

     LOCAL_MODULE_STEM := $(strip $(LOCAL_MODULE_STEM))

 ifeq ($(LOCAL_MODULE_STEM),)

     LOCAL_MODULE_STEM := $(LOCAL_MODULE)

 endif

 例：

   recovery模块编译recovery可执行文件：

   LOCAL_MODULE_STEM:=recovery

LOCAL_DONT_CHECK_MODULE

如果定义了该变量，那么模块将不被检查

ifdef LOCAL_DONT_CHECK_MODULE

  LOCAL_CHECKED_MODULE :=

endif

LOCAL_CHECKED_MODULE

需要检查的模块 

ifndef LOCAL_CHECKED_MODULE

  ifndef LOCAL_SDK_VERSION

    LOCAL_CHECKED_MODULE := $(LOCAL_BUILT_MODULE)

  endif

endif

LOCAL_BUILT_MODULE

表示编译链接后的目标文件(文件路径+文件名)

  LOCAL_BUILT_MODULE := $(built_module_path)/$(LOCAL_BUILT_MODULE_STEM)

  比如recovery:

  LOCAL_BUILT_MODULE 路径；

  out/Cyanogenmod/target/product/m7ul/obj/EXECUTABLES/recovery_intermediates/recovery

LOCAL_BUILT_MODULE_STEM

表示编译链接后的目标文件的文件名，带后缀

LOCAL_BUILT_MODULE_STEM := $(strip $(LOCAL_BUILT_MODULE_STEM))

ifeq ($(LOCAL_BUILT_MODULE_STEM),)

  LOCAL_BUILT_MODULE_STEM := $(LOCAL_INSTALLED_MODULE_STEM)

endif

例：

recovery模块编译recovery可执行文件：

LOCAL_INSTALLED_MODULE_STEM:=recovery

OVERRIDE_BUILT_MODULE_PATH

只有内部动态链接库模块可以使用OVERRIDE_BUILT_MODULE_PATH    

    OVERRIDE_BUILT_MODULE_PATH := $(strip $(OVERRIDE_BUILT_MODULE_PATH))

ifdef OVERRIDE_BUILT_MODULE_PATH

  ifneq ($(LOCAL_MODULE_CLASS),SHARED_LIBRARIES)

    $(error $(LOCAL_PATH): Illegal use of OVERRIDE_BUILT_MODULE_PATH)

  endif

  built_module_path := $(OVERRIDE_BUILT_MODULE_PATH)

else

  built_module_path := $(intermediates)

endif

LOCAL_INSTALLED_MODULE

表示模块的安装路径+文件名，存放在安装目录

ifneq (true,$(LOCAL_UNINSTALLABLE_MODULE))

 LOCAL_INSTALLED_MODULE := $(LOCAL_MODULE_PATH)/$(LOCAL_INSTALLED_MODULE_STEM)

  endif

  示例：

  out/Cyanogenmod/target/product/m7ul/system/bin/recovery

LOCAL_UNINSTALLABLE_MODULE

表示该模块是否安装至手机，像sdk文档模块不会被安装至手机，

 因此LOCAL_UNINSTALLABLE_MODULE为true

LOCAL_INTERMEDIATE_TARGETS

Assemble the list of targets to create PRIVATE_ variables for.

LOCAL_INTERMEDIATE_TARGETS += $(LOCAL_BUILT_MODULE)

LOCAL_UNSTRIPPED_PATH

没有strip的程序存放路径，通常放在symbols目录

Instructs the build system to put the unstripped version of the module somewhere 

other than what's normal for its type. 

Usually, you override this because you overrode LOCAL_MODULE_PATH for an executable or a shared 





library.

If you overrode LOCAL_MODULE_PATH, but not LOCAL_UNSTRIPPED_PATH, an error will occur.

LOCAL_MODULE_CLASS

将用于决定编译时的中间文件存放的位置

LOCAL_MODULE_CLASS在定义目标生成方式的makefile文件里定义，

  比如executable.mk里定义LOCAL_MODULE_CLASS := EXECUTABLES

在recovery模块的Android.mk里定义的LOCAL_MODULE_CLASS有：

  LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES

  LOCAL_MODULE_CLASS := UTILITY_EXECUTABLES

其它的LOCAL_MODULE_CLASS有

 LOCAL_MODULE_CLASS := ETC

 LOCAL_MODULE_CLASS := STATIC_LIBRARIES

 LOCAL_MODULE_CLASS := EXECUTABLES

 LOCAL_MODULE_CLASS := FAKE

 LOCAL_MODULE_CLASS := JAVA_LIBRARIES

 LOCAL_MODULE_CLASS := SHARED_LIBRARIES

 LOCAL_MODULE_CLASS := APPS

对应 Cyanogenmod/target/product/m7ul/obj 的目录 

  比如说若 LOCAL_MODULE_CLASS := ETC 

  那么该模块编译的中间文件将存放于

  Cyanogenmod/target/product/m7ul/obj/ETC

LOCAL_MODULE_SUFFIX

表示编译链接后的目标文件的后缀

LOCAL_PACKAGE_NAME

App名字 

示例： Dialer, Contacts, etc. 

This will probably change or go away when we switch to an ant-based build system for the apps.

LOCAL_OVERRIDES_PACKAGES

Some packages may override others using LOCAL_OVERRIDES_PACKAGE   

示例：

  packages/apps/DeskClock/Android.mk:13:LOCAL_OVERRIDES_PACKAGES := AlarmClock

LOCAL_EXPORT_PACKAGE_RESOURCES

若定义该变量，资源文件打包成一个apk

示例：

  frameworks/base/core/res/Android.mk:34:LOCAL_EXPORT_PACKAGE_RESOURCES := true

LOCAL_MANIFEST_PACKAGE_NAME

在build/core/definitions.mk里inherit-package函数有用到LOCAL_MANIFEST_PACKAGE_NAME 

LOCAL_REQUIRED_MODULES

本模块依赖的模块

 Set LOCAL_REQUIRED_MODULES to any number of whitespace-separated module names, like "libblah" or 





"Email". 

 If this module is installed, all of the modules that it requires will be installed as well. 

 This can be used to, e.g., ensure that necessary shared libraries 

 or providers are installed when a given app is installed

示例：  

LOCAL_REQUIRED_MODULES += $(installed_shared_library_module_names)

LOCAL_ACP_UNAVAILABLE

示例：

 build/tools/acp/Android.mk:23:LOCAL_ACP_UNAVAILABLE := true

LOCAL_MODULE_TAGS

模块的tag，为debug eng tests optional samples shell_ash shell_mksh等tag的组合，一个模块可有多个





Tag,

注意现在模块现在不能使用user作为模块的Tag,

  以前如果使用user做为tag,那么这个模块将被自动安装，

  如果想定义自动安装的模块，需要在PRODUCT_PACKAGES变量里添加该模块，

  该变量在build/target/product/base.mk和build/target/product/core.mk里有赋值，这是所有产品都将继承





的基础配置

  另外每个设备可在自己的产品配置文件device_*.mk里设置该变量，添加更多的模块 

如果当前目录或者父目录有*_GPL*的文件，那么将自动添加gnu的tag

LOCAL_SRC_FILES

源代码文件集合

LOCAL_PREBUILT_OBJ_FILES

示例：

   sdk/find_lock/Android.mk:50:LOCAL_PREBUILT_OBJ_FILES += images/$(FIND_LOCK_ICON_OBJ)

LOCAL_STATIC_JAVA_LIBRARIES

要链接的Java库，被链接的库将不会安装在手机上，因此会放到链接生成的java包里

示例：

 packages/apps/Exchange/Android.mk:24:LOCAL_STATIC_JAVA_LIBRARIES := android-common 





com.android.emailcommon

LOCAL_STATIC_LIBRARIES

表示模块要链接的静态库

   ifneq (,$(filter libcutils libutils,$(LOCAL_STATIC_LIBRARIES)))

    LOCAL_STATIC_LIBRARIES := $(call insert-liblog,$(LOCAL_STATIC_LIBRARIES))

  endif

  示例：external/busybox/Android.mk

  LOCAL_STATIC_LIBRARIES := libcutils libc libm

  最终：

     LOCAL_STATIC_LIBRARIES := libcutils libc libm liblog 

LOCAL_GROUP_STATIC_LIBRARIES

示例：

 build/core/binary.mk:223:ifeq (true,$(LOCAL_GROUP_STATIC_LIBRARIES))

LOCAL_WHOLE_STATIC_LIBRARIES

链接时会将LOCAL_WHOLE_STATIC_LIBRARIES类型的静态链接库的所有目标代码放入最终目标文件里，而不去掉

These are the static libraries that you want to include in your module without allowing the linker 





to remove dead code from them. This is mostly useful if you want to add a static library to a 





shared library and have the static library's content exposed from the shared library.

ifneq (,$(filter libcutils libutils,$(LOCAL_WHOLE_STATIC_LIBRARIES)))

  LOCAL_WHOLE_STATIC_LIBRARIES := $(call insert-liblog,$(LOCAL_WHOLE_STATIC_LIBRARIES))

endif

示例：

dalvik/vm/Android.mk

LOCAL_WHOLE_STATIC_LIBRARIES += libexpat libcutils libdex liblog libz

最终

 LOCAL_WHOLE_STATIC_LIBRARIES += libexpat libcutils libdex liblog libz liblog

LOCAL_SHARED_LIBRARIES

表示模块要链接的动态链接库

  ifneq (,$(filter libcutils libutils,$(LOCAL_SHARED_LIBRARIES)))

  LOCAL_SHARED_LIBRARIES := $(call insert-liblog,$(LOCAL_SHARED_LIBRARIES))

  endif  

示例：frameworks/av/media/mtp模块

Android.mk LOCAL_SHARED_LIBRARIES := libutils libcutils libusbhost libbinder

最终：LOCAL_SHARED_LIBRARIES： libutils liblog libcutils libusbhost libbinder  

LOCAL_IS_HOST_MODULE

表示该模块是否是将在主机上运行的模块

LOCAL_CC

你可以通过LOCAL_CC定义一个不同的C编译器

LOCAL_CXX

你可以通过LOCAL_CXX定义一个不同的C++编译器

LOCAL_CPP_EXTENSION

当前c++代码文件后缀

external/protobuf/Android.mk:177:LOCAL_CPP_EXTENSION := .cc

LOCAL_NO_DEFAULT_COMPILER_FLAGS

通常为C或者C++源代码文件的编译提供了默认的头文件目录和flag，可以通过





LOCAL_NO_DEFAULT_COMPILER_FLAGS设置不使用这些东东

LOCAL_NO_FDO_SUPPORT

示例：

build/core/binary.mk:136:ifeq ($(strip $(LOCAL_NO_FDO_SUPPORT)),)

LOCAL_ARM_MODE

示例：

ndk/tests/build/build-mode/jni/Android.mk:19:LOCAL_ARM_MODE := thumb

ndk/tests/build/build-mode/jni/Android.mk:32:LOCAL_ARM_MODE := arm  

LOCAL_YACCFLAGS

Any flags to pass to invocations of yacc for your module. 

A known limitation here is that the flags will be the same for all invocations of YACC for your 





module. 

This can be fixed. If you ever need it to be, just ask.

LOCAL_YACCFLAGS := -p kjsyy

LOCAL_ASFLAGS

Explicitly declare assembly-only __ASSEMBLY__ macro for

assembly source

  LOCAL_ASFLAGS += -D__ASSEMBLY__

LOCAL_CFLAGS

表示编译C代码时用的参数

LOCAL_CPPFLAGS

编译C++代码使用的flag

 ./frameworks/av/media/libstagefright/Android.mk:78:LOCAL_CPPFLAGS += -DUSE_TI_CUSTOM_DOMX

LOCAL_RTTI_FLAG

编译C++代码使用rtti标记

./external/icu4c/common/Android.mk:135:LOCAL_RTTI_FLAG := -frtti

LOCAL_C_INCLUDES

编译C代码使用的头文件目录

LOCAL_EXPORT_C_INCLUDE_DIRS

示例：

system/core/libsuspend/Android.mk:18:LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include

LOCAL_LDFLAGS

表示链接时用的参数

LOCAL_LDLIBS

额外的动态链接库

LOCAL_LDLIBS allows you to specify additional libraries that are not part of the build for your 





executable or library. 

Specify the libraries you want in -lxxx format; they're passed directly to the link line. 

However, keep in mind that there will be no dependency generated for these libraries.

It's most useful in simulator builds where you want to use a library preinstalled on the host.

The linker (ld) is a particularly fussy beast, 

so it's sometimes necessary to pass other flags here if you're doing something sneaky.

Some examples:

LOCAL_LDLIBS += -lcurses -lpthread

LOCAL_AAPT_FLAGS

使用aapt编译资源包时所用的flag

packages/apps/Calendar/Android.mk:35:LOCAL_AAPT_FLAGS := --auto-add-overlay

LOCAL_AAPT_INCLUDE_ALL_RESOURCES

使用AAPT编译时需用的一个标记，打包资源时会用到该比较

 build/core/package.mk:391:ifeq ($(LOCAL_AAPT_INCLUDE_ALL_RESOURCES),true)

 packages/inputmethods/LatinIME/java/Android.mk:37:LOCAL_AAPT_INCLUDE_ALL_RESOURCES := true

LOCAL_SYSTEM_SHARED_LIBRARIES

ifdef LOCAL_IS_HOST_MODULE

  ifeq ($(LOCAL_SYSTEM_SHARED_LIBRARIES),none)

LOCAL_SYSTEM_SHARED_LIBRARIES :=

  endif

else

  ifeq ($(LOCAL_SYSTEM_SHARED_LIBRARIES),none)

LOCAL_SYSTEM_SHARED_LIBRARIES := $(TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES)

  endif

endif

示例：

  TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES：libc libstdc++ libm

 LOCAL_SYSTEM_SHARED_LIBRARIES：libc libstdc++ libm

LOCAL_PREBUILT_LIBS

预编译好的库，当使用including $(BUILD_PREBUILT) or $(BUILD_HOST_PREBUILT)

会将LOCAL_PREBUILT_LIBS所指的库拷贝到安装目录

LOCAL_PREBUILT_EXECUTABLES

预编译好的可执行程序，一般通过include $(BUILD_PREBUILT)设置

会将预编译好的程序拷贝直接拷贝至安装目录

LOCAL_PREBUILT_JAVA_LIBRARIES

示例：

prebuilts/misc/common/kxml2/Android.mk:19:LOCAL_PREBUILT_JAVA_LIBRARIES := kxml2-2.3.0





$(COMMON_JAVA_PACKAGE_SUFFIX)

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES

示例：

packages/apps/CMUpdater/Android.mk:39:LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := 





dashclockapi:libs/dashclock-api-r1.1.jar

LOCAL_PREBUILT_STRIP_COMMENTS

示例：

build/core/prebuilt.mk:52:  ifneq ($(LOCAL_PREBUILT_STRIP_COMMENTS),)

LOCAL_INTERMEDIATE_SOURCES

示例：

frameworks/base/Android.mk:249:LOCAL_INTERMEDIATE_SOURCES := \

LOCAL_INTERMEDIATE_SOURCE_DIR

表示编译生成的源文件存放目录

LOCAL_INTERMEDIATE_SOURCE_DIR := $(intermediates.COMMON)/src

例：out/target/common/obj/EXECUTABLES/recovery_intermediates/src

LOCAL_JAVACFLAGS

If you have additional flags to pass into the javac compiler, add them here. For example:

 LOCAL_JAVACFLAGS += -Xlint:deprecation

LOCAL_JAVA_LIBRARIES

当链接java app程序和库时， LOCAL_JAVA_LIBRARIES指定了哪些java类将被包含，

目前只有 LOCAL_JAVA_LIBRARIES := core framework

注意目前编译app设置LOCAL_JAVA_LIBRARIES是不必要的，也不被允许的，在include  $(BUILD_PACKAGE)时

合适的库都会被包含进来

LOCAL_NO_STANDARD_LIBRARIES

示例：

  frameworks/base/Android.mk:254:LOCAL_NO_STANDARD_LIBRARIES := true

LOCAL_CLASSPATH

示例：

 external/javassist/Android.mk:21:LOCAL_CLASSPATH := $(HOST_JDK_TOOLS_JAR)

LOCAL_DROIDDOC_USE_STANDARD_DOCLET

示例：

device/sample/frameworks/PlatformLibrary/Android.mk:48:LOCAL_DROIDDOC_USE_STANDARD_DOCLET := true

LOCAL_DROIDDOC_SOURCE_PATH

示例：

build/core/droiddoc.mk:40:LOCAL_DROIDDOC_SOURCE_PATH := $(LOCAL_PATH)

LOCAL_DROIDDOC_TEMPLATE_DIR

暂时未见用到

LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR

示例：

frameworks/base/Android.mk:591:LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR:=build/tools/droiddoc/templates





-sdk

LOCAL_DROIDDOC_ASSET_DIR

示例：

build/core/droiddoc.mk:143:$(full_target): PRIVATE_OUT_ASSET_DIR := $(out_dir)/





$(LOCAL_DROIDDOC_ASSET_DIR)

LOCAL_DROIDDOC_CUSTOM_ASSET_DIR

示例：

build/tools/droiddoc/test/stubs/Android.mk:25:LOCAL_DROIDDOC_CUSTOM_ASSET_DIR:=assets-google

LOCAL_DROIDDOC_OPTIONS

示例：

device/sample/frameworks/PlatformLibrary/Android.mk:46:LOCAL_DROIDDOC_OPTIONS := 





com.example.android.platform_library

LOCAL_DROIDDOC_HTML_DIR

示例：

 frameworks/base/Android.mk:429:framework_docs_LOCAL_DROIDDOC_HTML_DIR := docs/html

LOCAL_ASSET_FILES

编译Android Package(app)程序时，通常用LOCAL_ASSET_FILES，表示assets目录的所有文件

通常使用方式：

LOCAL_ASSET_FILES += $(call find-subdir-assets)   

LOCAL_ASSET_DIR

编译Android Package(app)程序时，通常用LOCAL_ASSET_FILES，表示assets目录的所有文件

通常使用方式：

LOCAL_ASSET_FILES += $(call find-subdir-assets)   

LOCAL_RESOURCE_DIR

示例：

  packages/apps/Gallery2/Android.mk:59:LOCAL_RESOURCE_DIR += $(LOCAL_PATH)/res 

LOCAL_JAVA_RESOURCE_DIRS

示例：

frameworks/base/tools/layoutlib/bridge/Android.mk:20:LOCAL_JAVA_RESOURCE_DIRS := resources

LOCAL_JAVA_RESOURCE_FILES

示例：

  frameworks/base/Android.mk:261:LOCAL_JAVA_RESOURCE_FILES += $(LOCAL_PATH)/preloaded-classes

LOCAL_GENERATED_SOURCES

编译时生成的源代码文件，像aidl将转为java代码

LOCAL_COPY_HEADERS_TO

需要拷贝头头文件至哪个安装目录

LOCAL_COPY_HEADERS

需要拷贝至安装目录的头文件集合，你需要同时定义LOCAL_COPY_HEADERS_TO 

LOCAL_FORCE_STATIC_EXECUTABLE

强制编译为静态可执行文件，这样在执行时不会去查找动态链接库

一般只有安装在sbin目录下的可执行文件使用该变量

如果想程序在recovery下运行，一般都需要添加该变量

示例：

   LOCAL_FORCE_STATIC_EXECUTABLE := true

LOCAL_ADDITIONAL_DEPENDENCIES

额外的依赖

If your module needs to depend on anything else that isn't actually built in to it,

you can add those make targets to LOCAL_ADDITIONAL_DEPENDENCIES. 

Usually this is a workaround for some other dependency that isn't created automatically.

LOCAL_ENABLE_APROF

编译动态链接库时用到

LOCAL_ENABLE_APROF_JNI

示例：

  build/core/shared_library.mk:26:ifeq ($(strip $(LOCAL_ENABLE_APROF_JNI)),true)

LOCAL_COMPRESS_MODULE_SYMBOLS

暂未见赋值之处

示例：

build/core/dynamic_binary.mk:74:ifeq ($(LOCAL_COMPRESS_MODULE_SYMBOLS),true)

LOCAL_STRIP_MODULE

表示该模块生成的目标是否需要被strip

   Calculated in base_rules.make to determine if this module should actually be stripped or not,

   based on whether LOCAL_STRIPPABLE_MODULE is set, and whether the combo is configured to ever 





strip modules. 

   With Iliyan's stripping tool, this might change.

LOCAL_JNI_SHARED_LIBRARIES

示例：

  packages/inputmethods/LatinIME/java/Android.mk:27:LOCAL_JNI_SHARED_LIBRARIES := libjni_latinime

LOCAL_JNI_SHARED_LIBRARIES_ABI

暂未见赋值之处 

示例：

  build/core/package.mk:346:    jni_shared_libraries_abi := $(LOCAL_JNI_SHARED_LIBRARIES_ABI)

LOCAL_JAR_MANIFEST

示例：

  cts/tools/dasm/src/Android.mk:24:LOCAL_JAR_MANIFEST := ../etc/manifest.txt

LOCAL_INSTRUMENTATION_FOR

示例：

 packages/apps/Gallery/tests/Android.mk:15:LOCAL_INSTRUMENTATION_FOR := Gallery

LOCAL_MANIFEST_INSTRUMENTATION_FOR

示例：

  build/core/definitions.mk:2046:    $(call keep-or-





override,LOCAL_MANIFEST_INSTRUMENTATION_FOR,$(patsubst &&%,%,$(word 7,$(_o)))) \

LOCAL_AIDL_INCLUDES

示例：

  build/core/base_rules.mk:185:LOCAL_AIDL_INCLUDES += $(FRAMEWORKS_BASE_JAVA_SRC_DIRS)

LOCAL_JARJAR_RULES

示例：

  frameworks/base/Android.mk:263:#LOCAL_JARJAR_RULES := $(LOCAL_PATH)/jarjar-rules.txt

  build/core/java.mk:281:$(full_classes_jarjar_jar): PRIVATE_JARJAR_RULES := $(LOCAL_JARJAR_RULES)

LOCAL_ADDITIONAL_JAVA_DIR

示例：

 





frameworks/base/Android.mk:738:LOCAL_ADDITIONAL_JAVA_DIR:=$(framework_docs_LOCAL_ADDITIONAL_JAVA_D





IR)

LOCAL_ALLOW_UNDEFINED_SYMBOLS

示例：

 bionic/libthread_db/Android.mk:27:LOCAL_ALLOW_UNDEFINED_SYMBOLS := false

LOCAL_DX_FLAGS

用dx处理jar代码的flag

LOCAL_CERTIFICATE

签名用的证书

./device/samsung/galaxys2-common/DeviceSettings/Android.mk:11:LOCAL_CERTIFICATE := platform

LOCAL_SDK_VERSION

build/core/java.mk里定义该变量

LOCAL_SDK_VERSION := $(PDK_BUILD_SDK_VERSION)

如果定义了LOCAL_SDK_VERSION，那么需要定义ndk编译相关变量

因为编译app时，常需要编译jni代码

示例：LOCAL_SDK_VERSION: 9

LOCAL_SDK_RES_VERSION

./build/core/static_java_library.mk:62:LOCAL_SDK_RES_VERSION:=$(strip $(LOCAL_SDK_RES_VERSION))

LOCAL_NDK_STL_VARIANT

./packages/inputmethods/LatinIME/native/jni/Android.mk:97:LOCAL_NDK_STL_VARIANT := stlport_static

LOCAL_EMMA_INSTRUMENT

使用emma进行覆盖代码测试

 ./build/core/java_library.mk:54:LOCAL_EMMA_INSTRUMENT := false

LOCAL_PROGUARD_ENABLED

是否启用混淆

LOCAL_PROGUARD_FLAGS

混淆使用的flag

LOCAL_PROGUARD_FLAG_FILES

混淆使用的flag文件

LOCAL_EMMA_COVERAGE_FILTER

示例：

  packages/apps/Browser/Android.mk:20:LOCAL_EMMA_COVERAGE_FILTER := *,-com.android.common.*

LOCAL_WARNINGS_ENABLE

示例：

  build/core/definitions.mk:1468:    $(if $(findstring 





true,$(LOCAL_WARNINGS_ENABLE)),$(xlint_unchecked),) \

LOCAL_FULL_MANIFEST_FILE

示例：

 build/core/package.mk:63:LOCAL_FULL_MANIFEST_FILE := $(LOCAL_PATH)/$(LOCAL_MANIFEST_FILE)

LOCAL_MANIFEST_FILE

示例：

  build/core/package.mk:57:LOCAL_MANIFEST_FILE := AndroidManifest.xml

LOCAL_RENDERSCRIPT_INCLUDES

示例：

 





frameworks/base/tests/RenderScriptTests/ImageProcessing2/Android.mk:30:LOCAL_RENDERSCRIPT_INCLUDES





_OVERRIDE := $(TOPDIR)external/clang/lib/Headers \

LOCAL_RENDERSCRIPT_INCLUDES_OVERRIDE

示例：

  





frameworks/base/tests/RenderScriptTests/ImageProcessing2/Android.mk:30:LOCAL_RENDERSCRIPT_INCLUDES





_OVERRIDE := $(TOPDIR)external/clang/lib/Headers \

LOCAL_RENDERSCRIPT_CC

示例：

  build/core/java.mk:161:LOCAL_RENDERSCRIPT_CC := $(LLVM_RS_CC)

LOCAL_RENDERSCRIPT_FLAGS

示例：

 frameworks/base/tests/RenderScriptTests/ImageProcessing2/Android.mk:33:LOCAL_RENDERSCRIPT_FLAGS 





:= -rs-package-name=android.support.v8.renderscript

LOCAL_RENDERSCRIPT_TARGET_API

示例：

 





frameworks/base/tests/RenderScriptTests/ImageProcessing2/Android.mk:29:LOCAL_RENDERSCRIPT_TARGET_A





PI := 17

LOCAL_BUILD_HOST_DEX

示例：

   libcore/JavaLibrary.mk:137:LOCAL_BUILD_HOST_DEX := true

LOCAL_DEX_PREOPT

如果编译模式选择的是user或者userdebug，那么LOCAL_DEX_PREOPT默认为true，这样资源apk和代码文件分离

成为odex

 build/core/package.mk:156:LOCAL_DEX_PREOPT := true

LOCAL_PROTOC_OPTIMIZE_TYPE

示例：

  hardware/ril/mock-ril/Android.mk:57:LOCAL_PROTOC_OPTIMIZE_TYPE := full

LOCAL_PROTOC_FLAGS

编译.proto文件使用的flag，暂未见赋值

 build/core/binary.mk:291:$(proto_generated_cc_sources): PRIVATE_PROTOC_FLAGS := 





$(LOCAL_PROTOC_FLAGS)

LOCAL_NO_CRT

示例：

   bionic/linker/Android.mk:70:LOCAL_NO_CRT := true

LOCAL_PROPRIETARY_MODULE

是否是设备专有模块

LOCAL_MODULE_OWNER

示例：

  vendor/samsung/galaxys2-common/proprietary/Android.mk:21:LOCAL_MODULE_OWNER := samsung

LOCAL_CTS_TEST_PACKAGE

示例：

cts/tests/uiautomator/Android.mk:29:LOCAL_CTS_TEST_PACKAGE := android.uiautomator

LOCAL_CTS_TEST_RUNNER

示例：

   cts/tests/tests/accessibilityservice/Android.mk:32:LOCAL_CTS_TEST_RUNNER := 





com.android.cts.tradefed.testtype.AccessibilityServiceTestRunner

LOCAL_CLANG

表示编译C代码

LOCAL_ADDRESS_SANITIZER

地址对齐

LOCAL_JAR_EXCLUDE_FILES

示例：

     build/core/static_java_library.mk:44:LOCAL_JAR_EXCLUDE_FILES := 





$(ANDROID_RESOURCE_GENERATED_CLASSES)

LOCAL_LINT_FLAGS

暂未见赋值之处

LOCAL_SOURCE_FILES_ALL_GENERATED

LOCAL_SOURCE_FILES_ALL_GENERATED is set only if the module does not have static source files,

but generated source files in its LOCAL_INTERMEDIATE_SOURCE_DIR

You have to set up the dependency in some other way.

LOCAL_DONT_DELETE_JAR_META_INF

示例：

  cts/tests/core/ctscore.mk:24:LOCAL_DONT_DELETE_JAR_META_INF := true

  build/core/java.mk:263:$(full_classes_compiled_jar): PRIVATE_DONT_DELETE_JAR_META_INF := 





$(LOCAL_DONT_DELETE_JAR_META_INF)