sh setup_ndk_env.sh

自动下载NDK并解压

提取Android平台工具链 

 验证Android工具链 

设置工具链变量

export CROSS_TRIPLE=aarch64_linux_android
export CROSS_ROOT=/home/ubuntu/${CROSS_TRIPLE}
export ANDROID_NDK=${CROSS_ROOT}
export AS=${CROSS_ROOT}/bin/llvm-as
export AR=${CROSS_ROOT}/bin/llvm-ar
export CC=${CROSS_ROOT}/bin/clang
export CXX=$