Per-directory locking in target directory

[redactedontop]

Howdy! I'm gonna be going directly to the point, sorry if this is inadequate.

Problem

I have a system target directory (better than sccache as it's a bit faster, removes the need to fiddle around with portage to make it work, and works with crate types that invoke the system linker like dylib/bin and/or incremental compilation), which I enjoy a lot. Problem is, I can't do parallel rust compilations (once again, with portage) as cargo locks the whole target directory, and not just what it uses.

Proposed Solution

A flag/option (potentially set to true by default) to only lock the files in use, for the duration of use.

[epage]

This looks to be a duplicate of #4282 and so I'm closing in favor of that. If there is something I missed that sets this apart, let us know!

[redactedontop]

Thanks for the quick response. I agree this issue's a duplicate.