Facts:

Incremental compilation from 1.24 stable: https://blog.rust-lang.org/2018/02/15/Rust-1.24.html

Cargo recompiles dependencies only after "cargo clean" or after Rust version update.

Cargo surely recompiles common dependencies across crates, unless one uses the workspace trick and even then recompiles do happen.

Just get Gtk-rs, get nightly and then trace the build log. I once even mailed Rust devs about it.

Incremental compilation still isn't up to incremental compilation + incremental linking, which is why I explicitly mentioned both on my comment.

1. Hacker News won't let you downvote someone who replies to you, so it is literally impossible for you to have downvoted in this situation.

2. Both of you are correct, because you're talking about different things. Evgeniy means "You only need to compile your dependencies upon the first build", and you mean "if I use the same dependency in two projects, it will be compiled twice, once on the initial compile of both."

Even when I sometimes sound negative, I really appreciate your work.

Rust achievements thus far already influenced design decisions in other languages.

Given how often Rust updates, it might as well.