I tried `-Z emit-stack-sizes` and `cargo-call-stack` so far without success. I'm cross-compiling and have the appropriate target (thumbv8m.main-none-eabihf) installed. But just setting `RUSTFLAGS` to `-Z emit-stack-sizes` and building with
```
$ cargo +nightly build --example hello-stack --target thumbv8m.main-none-eabihf
```
gives me the error message
```
error[E0463]: can't find crate for `core`
  |
  = note: the `thumbv8m.main-none-eabihf` target may not be installed
  = help: consider downloading the target with `rustup target add thumbv8m.main-none-eabihf`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`
```