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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: `eval-when-compile' and circular dependencies (was: Re: Source
	file '.../killer-source.el' newer than byte-compiled file)
Date: Thu, 25 Apr 2019 09:37:17 +0300
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> From: Emanuel Berg <moasenwood@zoho.eu>
> Date: Thu, 25 Apr 2019 05:25:28 +0200
> 
> >>> but you will have trouble if you have
> >>> circular dependencies.
> >>
> >> No, I don't have circular dependencies, and
> >> I don't think I can have them, either.
> >> Actually I'm gonna try that right now...
> >> 
> >> No, I can't
> >
> > Not easily, no.
> 
> Why would you want them?

We don't, it just happens.

> And how do you make it work, if so?

You could look at Eshell as one example, if you really want to
understand.  The solution involves using eval-when-compile and its
ilk, I think.