https://github.com/abenkhadra/llvm-pass-tutorial
wget -O - https://apt.vvlm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main"
sudo apt-get update
sudo apt-get instlal -y clang-6.0
按照intall.md去配置