下载

git clone https://github.com/llvm/llvm-project.git
cd llvm-project
git checkout release/12.x

编译：

mkdir build
cd build/
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/junqiang/llvm-12.x -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_ASSERTIONS=On -DCMAKE_C_COMPILER=/usr/local/bin/gcc ../llvm/
make
make install