Build Android NDK Toolchain From Source Code
I. Environment
mkdir ndkdev
cd ndkdev
git clone /root/aosp/mirror/platform/development.git
git clone /root/aosp/mirror/platform/ndk.git
git clone /root/aosp/mirror/platform/prebuilt.git
mkdir toolchain
cd toolchain
repo init -u /root/aosp/mirror/toolchain/manifest.git
repo sync
mkdir prebuilts
cd prebuilts
mkdir gcc
mkdir tools