From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH 1/4] lint: Add packages with suffix ':bin' to
	'inputs-should-be-native'.
Date: Fri, 22 Jul 2016 15:32:48 +0200
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In-Reply-To: <87ad02716d589c2bf486478bc76199e0@tobias.gr> (Tobias
	Geerinckx-Rice's message of "Thu, 21 Jul 2016 21:27:49 +0200")
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To: Tobias Geerinckx-Rice <me@tobias.gr>
Cc: guix-devel <guix-devel@gnu.org>, Guix-devel <guix-devel-bounces+me=tobias.gr@gnu.org>, David Craven <david@craven.ch>

Tobias Geerinckx-Rice <me@tobias.gr> skribis:

> On 2016-07-21 18:06, ludo@gnu.org wrote:
>>>>   (inputs `(("somethingsilly" ,glib "bin")))
>>
>> This "somethingsilly" is just a label that allows you to refer to an
>> input on the build side, in idioms like:
>>
>>   (assoc-ref inputs "somethingsilly")
>>   =3D> "/gnu/store/=E2=80=A6-glib-42.0-bin"
>
> I remember writing something like
>
>   (inputs `(("libuuid" ,util-linux)))
>
> once, to indicate that libuuid really is all we need and that one
> could swap out util-linux for another =E2=80=94 extremely hypothetical =
=E2=80=94
> libuuid provider.
>
> Was this, in hindsight, somethingsilly? :-)

I think it=E2=80=99s fine, but a comment would work well too.

> If so, is there still a reason to keep all this duplication around?

Build systems haven=E2=80=99t migrated yet to gexps.  There=E2=80=99s a bra=
nch to do
that, =E2=80=98wip-build-systems-gexp=E2=80=99, but there=E2=80=99s a perfo=
rmance regression
compared to what we have, which is why I have not merged it.

That=E2=80=99ll happen, someday, but even then, I=E2=80=99m not sure we=E2=
=80=99ll remove
labels; at least we won=E2=80=99t remove them overnight, for sure.  ;-)

>> This predates g-expressions, which solve this problem more elegantly.
>
> Interesting! I always assumed[1] gexps were one of the foundations for
> Guix since day 0.

In an ideal world it would have been this way.  :-)

Ludo=E2=80=99.