Does anyone else use the `-D warnings` to get error on warnings in CI? When I do this for embedded targets the don't link properly and I'm not sure why.

In our CI file we have as a global environment variable:

```
image:
  name: 'rust:1.73'
  pull_policy: if-not-present

variables:
  RUSTFLAGS: -D warnings # deny warnings in CI

...

```

Maybe someone has had a similar issue?