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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH] build: pull: Compile .scm files in one process.
Date: Wed, 11 Nov 2015 14:26:46 +0100
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In-Reply-To: <87mvuku444.fsf@T420.taylan> ("Taylan Ulrich
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To: Taylan Ulrich =?utf-8?Q?=22Bay=C4=B1rl=C4=B1?=
	=?utf-8?Q?=2FKammer=22?= <taylanbayirli@gmail.com>
Cc: guix-devel@gnu.org

taylanbayirli@gmail.com (Taylan Ulrich "Bay=C4=B1rl=C4=B1/Kammer") skribis:

> ludo@gnu.org (Ludovic Court=C3=A8s) writes:

[...]

>> (gnu scripts environment) imports (gnu packages bash), so we end up
>> loading a big bunch of (gnu packages =E2=80=A6) modules.
>>
>> The problem is that (gnu packages commencement) refers to (gnu packages
>> bash) from its top-level.  But here, we are loading (gnu packages bash)
>> first, which somehow entails loading (gnu packages cross-base), which
>> loads (gnu packages commencement), which sees a (gnu packages bash)
>> module containing zero bindings.
>>
>> What=E2=80=99s unclear to me though is why (gnu packages cross-base) get=
s loaded
>> in the first place.
>>
>> Could you investigate in that direction?
>
> It seems to be
>
> (guix scripts environment) -> (gnu system linux-container) ->
> (gnu system) -> (gnu packages firmware) -> (gnu packages cross-base)

Good catch.

I=E2=80=99m not sure how to address that.  We could introduce lazy referenc=
es
with =E2=80=98module-ref=E2=80=99 at any of these stages.  That would work =
but sounds
like a hack.  Hmm.  Ideas?  :-)

> It would be amazing if we could easily create graphs of Guile modules...

We can do it with =E2=80=98guild use2dot=E2=80=99 (with the caveat that we =
need to
explicitly load (guix gexp) before because otherwise it borks when it
sees #~ and the likes.)  However the resulting graph is pretty much
intractable.

That said, it may be nice to have a similar tool that we could also use
to build Makefile rules or to make a topological sort so =E2=80=98guix pull=
=E2=80=99
builds files in topological order.  But that=E2=80=99s more of an optimizat=
ion,
I think.

Ludo=E2=80=99.