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1、

'ndk-build' OverviewI. Usage:The Android NDK r4 introduced a new tiny shell script, named 'ndk-build', to simplify building machine code.The script is located at the top-level directory of the NDK, and shall be invoked from the command-line when in your application project directory, or any of its sub-directories. For example:    cd $PROJECT    $NDK/ndk-buildWhere $NDK points to your NDK installation path. You can also create an alias or add $NDK to your PATH to avoid typing it every time.II. Options:All parameters to 'ndk-build' are passed directly to the underlying GNU Make command that runs the NDK build scripts. Notable uses include:    ndk-build                  --> rebuild required machine code.    ndk-build clean            --> clean all generated binaries.    ndk-build NDK_DEBUG=1      --> generate debuggable native code.    ndk-build V=1              --> launch build, displaying build commands.    ndk-build -B               --> force a complete rebuild.    ndk-build -B V=1           --> force a complete rebuild and display build                                  commands.    ndk-build NDK_LOG=1        --> display internal NDK log messages                                  (used for debugging the NDK itself).    ndk-build NDK_DEBUG=1      --> force a debuggable build (see below)    ndk-build NDK_DEBUG=0      --> force a release build (see below)    ndk-build NDK_HOST_32BIT=1 --> Always use toolchain in 32-bit (see below)    ndk-build NDK_APPLICATION_MK=
   
          --> rebuild, using a specific Application.mk pointed to by          the NDK_APPLICATION_MK command-line variable.    ndk-build -C 
    
          --> build the native code for the project                                  path located at 
     
      . Useful if you                                  don't want to 'cd' to it in your terminal.
     
    
   

(摘自NDK说明文档NDK-BUILD.html)

2、

我们看到上面ndk-build有很多可选参数，那在cocos2dx中，这些参数使用的呢？

我们都知道在2.X版本中，我们都是通过build_native.sh脚本，编译cocos2dx项目， 那么我们怎么通过build_native.sh脚本使用上面的参数呢？ 下面是从build_native.sh脚本中摘出来的：

if [[ "$buildexternalsfromsource" ]]; then    echo "Building external dependencies from source"    "$NDK_ROOT"/ndk-build -C "$APP_ANDROID_ROOT" $* \        "NDK_MODULE_PATH=${COCOS2DX_ROOT}:${COCOS2DXTALKINGDATA_ROOT}:${COCOS2DX_ROOT}/cocos2dx/platform/third_party/android/source"else    echo "Using prebuilt externals"    "$NDK_ROOT"/ndk-build -C "$APP_ANDROID_ROOT" $* \        "NDK_MODULE_PATH=${COCOS2DX_ROOT}:${COCOS2DXTALKINGDATA_ROOT}:${COCOS2DX_ROOT}/cocos2dx/platform/third_party/android/prebuilt"fi

看下这部分：

"$NDK_ROOT"/ndk-build -C "$APP_ANDROID_ROOT" $* \        "NDK_MODULE_PATH=${COCOS2DX_ROOT}:${COCOS2DXTALKINGDATA_ROOT}:${COCOS2DX_ROOT}/cocos2dx/platform/third_party/android/prebuilt"

解释： $NDK_ROOT -- NDK工具的根目录，在这里有ndk-build执行程序 -C "$APP_ANDROID_ROOT"  -- 编译的工程，参看第一部分 $*  -- shell脚本，传递给脚本或函数的所有参数。 总结：所以如果我们需要使用上面ndk-build命令的可选参数，直接在执行build_native.sh脚本时，添加在后面即可。 例子： $ ./build_native.sh clean

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