Reusing a built LLVM (e.g with git worktrees)

[dwijnand]

Creating a new git worktree (or full clone) of Rust requires rebuilding LLVM, which takes "forever".

Should the guide include tips on how to mitigate this? What are established rustc hackers doing to avoid this overhead?

[mark-i-m]

cc #71

[mark-i-m]

Personally, I've been just rebuilding LLVM... it's a pain, but it only happens the first time I create the worktree...

[phansch]

I think this issue can be closed as it's documented here now: https://rustc-dev-guide.rust-lang.org/building/suggested.html?highlight=llvm#building-with-system-llvm