Using LLVM somewhere in the build doesn't require that you compile everything with LLVM. It generates object files, just like GCC, and you can link together obj

Using LLVM somewhere in the build doesn't require that you compile everything with LLVM. It generates object files, just like GCC, and you can link together object files compiled with each compiler, as long as they don't use compiler-specific runtime libraries (like the C++ standard library, or a polyfill compiler-rt library). `clang-cl` does this with `cl.exe` on Windows.