Building LLVM with CMake — LLVM 15.0.0git documentationhttps://llvm.org/docs/CMake.html
1、clone llvm 源码
git clone https://github.com/llvm/llvm-project.git
2、llvm 编译安装
$ cd llvm-project
$ mkdir build
$ cd build
$ cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/opt/selfLLVM/ -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;compiler-rt;lld" -DLLVM_ENABLE_RTTI=true ../llvm/
$ make -j && make install