NDK 学习

NDK提供的变量

include $(CLEAR_VARS)

CLEAR_VARS
清除所有除LOCAL_PATH以外的LOCAL_样式的变量
BUILD_SHARED_LIBRARY
跟include $(CLEAR_VARS)配套使用，声明一个module，生成动态库 
BUILD_STATIC_LIBRARY
PREBUILT_SHARED_LIBRARY
PREBUILT_STATIC_LIBRARY
TARGET_ARCH
TARGET_PLATFORM
TARGET_ARCH_ABI
TARGET_ABI
函数$(call <function>)
my-dir
	LOCAL_PATH := $(call my-dir)
	Android.mk以这句开头，调用my-dir函数获得调用者的路径
	在include $(LOCAL_PATH)/foo/Android.mk之后调用LOCAL_PATH := $(call my-dir)，此时LOCAL_PATH 的路径是foo
		所以include最好在Android.mk末尾
all-subdir-makefiles
	include子目录的Android.mk
this-makefile
	这个makefile的路径
parent-makefile
grand-parent-makefile
import-module
	其他module的路径，include这些Android.mk，路径相对于NDK_MODULE_PATH

     
     

      
      	COCOS2D-X中，NDK_MODULE_PATH在pro.android的build_native.sh里定义了，路径之间用：分开
     
     
     
     

      
       	"NDK_MODULE_PATH=${COCOS2DX_ROOT}:${COCOS2DX_ROOT}/cocos2dx/platform/third_party/android/prebuilt"
     
     
Module-description variables:
LOCAL_PATH
LOCAL_MODULE
module name，build system自动加prefix和suffix   
eg. LOCAL_MODULE := cocosdenshion_static
LOCAL_MODULE_FILENAME
override LOCAL_MODULE，system自动加后缀
eg. LOCAL_MODULE_FILENAME := libcocosdenshion
LOCAL_SRC_FILES
source file，用\分隔
LOCAL_SRC_FILES := SimpleAudioEngine.cpp \
                   jni/SimpleAudioEngineJni.cpp \
LOCAL_CPP_EXTENSION
用来指定C++代码文件的扩展名，默认是'.cpp',但是你可以改变它，比如：
LOCAL_CPP_EXTENSION := .cxx
LOCAL_CPP_FEATURES
LOCAL_C_INCLUDES
LOCAL_CFLAGS
LOCAL_CXXFLAGS
LOCAL_CPPFLAGS
LOCAL_STATIC_LIBRARIES
LOCAL_SHARED_LIBRARIES
LOCAL_WHOLE_STATIC_LIBRARIES
LOCAL_LDLIBS
LOCAL_ALLOW_UNDEFINED_SYMBOLS
LOCAL_ARM_MODE
LOCAL_ARM_NEON
LOCAL_DISABLE_NO_EXECUTE
LOCAL_DISABLE_RELRO
LOCAL_EXPORT_CFLAGS
LOCAL_EXPORT_CPPFLAGS
LOCAL_EXPORT_C_INCLUDES
LOCAL_EXPORT_LDLIBS
LOCAL_SHORT_COMMANDS
LOCAL_FILTER_ASM