Allow usage of cargo-codspeed with sccache

[danking]

Hey all,

I want to use codspeed to benchmark spiraldb/vortex. You can see the code for the workflow here: https://github.com/spiraldb/vortex/pull/848/files . The setup-rust action sets three environment variables which I've confirmed are set in the GitHub Action step that runs cargo codspeed build:

SCCACHE_GHA_ENABLED=true
RUSTC_WRAPPER=sccache
CARGO_INCREMENTAL=0

We also have sccache enabled for our CI build. You can see the logs for the CI build on the PR that adds codspeed here. It compiles much faster (~4 minutes, including running tests etc.). In contrast, cargo codspeed build takes ~20 minutes. Have I done something wrong? How do I properly convey the RUSTC_WRAPPER information to cargo when it is run by CodSpeed? (Docs about RUSTC_WRAPPER and sccache are here).

[art049]

Hello @danking, I think this might be caused by the way we interact with cargo through the API; thus, the RUSTC_WRAPPER might not be passed/used.

Fixing #50 would probably make using sccache usable. I'll mark this issue as related. In the meantime, are the benches usable?