llvm build and installation (set.sh, install.sh, install_lldb.sh): https://solarianprogrammer.com/2013/01/17/building-clang-libcpp-ubuntu-linux/
sudo apt-get install cmake libffi-dev libedit-dev swig git gcc-8 g++-8
git clone https://github.com/sailfish009/llvm_all
git clone https://github.com/llvm/llvm-project
cd llvm-project
cp ../llvm_all/*.sh .
./set.sh
./install.sh
./install_lldb.sh