Rust Link time · contributing · Zulip Chat Archive

Does the rust linker take a long time for anyone else?
If I make a small change, recompiling takes a couple of seconds until it hits linking, then it takes well over a minute; probably significantly longer, I haven't actually timed it

Brian Carroll (Mar 06 2022 at 15:03):

What OS and CPU architecture are you on?

Brian Carroll (Mar 06 2022 at 15:06):

I haven't had it that slow no. I think there's a way to swap the linker using a cargo config file.

Brian Carroll (Mar 06 2022 at 15:06):

~/.cargo/config.toml

Brian Carroll (Mar 06 2022 at 15:06):

rustflags = ["-C", "link-arg=-fuse-ld=lld", "-C", "target-cpu=native"]

Brian Carroll (Mar 06 2022 at 15:07):

are you doing that already?

Derek Gustafson (Mar 06 2022 at 15:08):

I'm using WSL

Derek Gustafson (Mar 06 2022 at 15:09):

I found a comment on a rust blog that using LLVM's linker is faster

Derek Gustafson (Mar 06 2022 at 15:09):

image.png

Brian Carroll (Mar 06 2022 at 15:10):

yes that's what the config I posted does

Brian Carroll (Mar 06 2022 at 15:10):

lld is llvm's linker

Brian Carroll (Mar 06 2022 at 15:10):

on WSL you need to have all your files in the Linux filesystem rather than Windows or things will be crazy slow. I had that problem when I was first setting up on this project.