> I thought about that. Obviously it makes the Makefile harder (since you
> need one that can cope with both the C framework and the Lisp
> framework), which is why I though to keep things separate.

Well, Emacs isn't a project known by the simplicity of its makefiles ;-)

> Very open to persuasion.

We don't have a C testing framework, and we don't know when, or if, we'll have one. I'd say worrying about how complex the makefiles will be for that case is a bit premature.

Just my 0.02€