Something like:

```
[build]
target = "thumbv7em-none-eabihf"
rustflags = [
    # Workaround: Regression in `opt-level='z'` when the machine outliner
    # is active in LLVM17, see:
    #
    # * https://github.com/rust-embedded/cortex-m/discussions/503
    # * https://github.com/rust-lang/rust/issues/118867
    "-C", "llvm-args=--enable-machine-outliner=never",
]
```