We’re using CMake now to build LLVM. So the path is clear to rebase the Rust and emscripten ports to the same merge-base. The plan is going to be complicated by the upcoming AVR port, which also wants to impose some LLVM churn.
Right now I think the best thing to do is for Rust to port forward to LLVM master (which we’re going to need to do no matter what), then coordinate with @shepmaster to figure out how much more upgrading we need to do on AVR, and @kripken to rebase onto the same commit.
Anybody interested in doing the LLVM forward port?