Does not allow for optimizations for WASM targets

[Gustav Wengel]

I have a WASM server-side project I'd love to try out PGO on. Unfortunately it does not seem to work. E.g. running the command

cargo pgo instrument build -- --bin my-binary--release --target wasm32-wasi

results in the error

error[E0463]: can't find crate for `profiler_builtins`

however, the same command without the --target does not provoke the same error.

I do not necessarily think this is anything cargo-pgo can do anything about - I believe the underlying issue is this one. I figured I'd create an issue anyways, in case I was wrong, or anyone else came looking for the same information.

[Jakub Beránek]

Yeah, this is not related to this crate. That error simply means that this specific target is not distributed with support for PGO. Either because this target doesn't support it, or simply because we just don't build and ship it on CI via rustup.

[Gustav Wengel]

That makes sense. Feel free to close, but just wanted to point this out if someone else came searching for it :)