At least in my case the right step that compiled successfully:
git clone https://github.com/llvm/llvm-project.git
~$ cd llvm-project
llvm-project$ git checkout release/17.x
llvm-project$ mkdir llvm/build
llvm-project$ cd llvm/build
build$ cmake .. -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang"
build$ make
At least in my case the right step that compiled successfully: git clone https://github.com/llvm/llvm-project.git ~$ cd llvm-project llvm-project$ git checkout release/17.x llvm-project$ mkdir llvm/build llvm-project$ cd llvm/build build$ cmake .. -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang" build$ make