From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Circular dependencies in gnu/packages, weird error message
Date: Fri, 04 Nov 2016 15:37:52 +0100
Message-ID: <871syr1fb3.fsf@gnu.org>
References: <20161104022451.4c7690eb@scratchpost.org>
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In-Reply-To: <20161104022451.4c7690eb@scratchpost.org> (Danny Milosavljevic's
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel@gnu.org

Hi,

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> I cannot import (gnu packages cross-base) in (gnu packages admin) (it gav=
e an incomprehensible-to-me error message [*]). What could be the cause?

Some (gnu packages =E2=80=A6) modules were referring to bindings from other
modules at the top level, which doesn=E2=80=99t play well with circular mod=
ule
dependencies.

Commits fb77c61422ae2d03c0bf655d96b0e88f5f8001da and
bd2e1a8cb07088bdc54b9bb05d9b2e99f78e5b28 work around that.

You should now be able to add #:use-module (gnu packages cross-base) in
admin.scm.

> Since I speculated maybe circular dependencies are the cause (?), I wrote=
 a quick one-off script to find define-module and #:use-module forms and re=
format them into Makefile rules. This allowed me to find all the circular d=
ependencies between the modules in gnu/packages.

Fun hack.  :-)

Thanks,
Ludo=E2=80=99.