[ecesena]

For configurations, rust supports features. To me they look very similar to ifdefs in C, except they're managed directly by cargo and can be passed down into dependencies and modules.

You can decide how to use them, for example you can very much create "fat drivers".

If you want to see an example, here's how we build for dev vs release, on two different boards. Cargo makes it really smooth. https://github.com/solokeys/solo2/blob/main/runners/lpc55/Ma...

Similarly, for testing, one annoyance for us is that in theory the user should press a button for every action. We have a feature to disable that, just so we can run integration tests (either on PC or on device) more smoothly.