Maybe output a few lines? To tell that the object file was created at path/foo.o, it should be copied to the target system (if needed) then run the following command to link the executable for example.

We have this:

https://crystal-lang.org/docs/syntax_and_semantics/cross-compilation.html

I think that documents it more or less well. Adding just a line here won't work well... plus I think there's a lot more to do than just copy an .o, as you might need to install libs, maybe other stuff too.

Should we close this or merge this? (once rebased)

i vote close - at least this way you can actually grab the cross-compile command programatically and run it somewhere. With this PR you'd have to strip out the message