本地編譯ijkplayer, 需要除錯ndk, 按照`0003-armv7a-enable-debugging-with-LLDB.patch`所說進行修改. 
但是執行時提示:
ndk missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
查找了一番, 沒有找到直接的答案. 

通過提示知道需要給cpp增加一個標識, 按照如下這樣在gradle的 cppFlags 增加 "-D__STDC_CONSTANT_MACROS"即可.

defaultConfig {
    minSdkVersion 14
    targetSdkVersion rootProject.ext.targetSdkVersion
    externalNativeBuild {
        ndkBuild {
            arguments "NDK_APPLICATION_MK:=src/main/jni/Application.mk"//,"APP_ABI=armeabi-v7a","NDK_ALL_ABIS=armeabi-v7a"//,"NDK_LIBS_OUT:=src/main/libs"
            cFlags "-DTEST_C_FLAG1", "-DTEST_C_FLAG2"  // output dir -> 'src/main/libs'
            cppFlags "-DTEST_CPP_FLAG2", "-DTEST_CPP_FLAG2", "-D__STDC_CONSTANT_MACROS"
            abiFilters "armeabi"
        }
    }
}