From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#22437: Fixing package-with-python2
Date: Sun, 07 Feb 2016 21:42:26 +0100
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To: Efraim Flashner <efraim@flashner.co.il>
Cc: guix-devel <guix-devel@gnu.org>, 22437@debbugs.gnu.org

Efraim Flashner <efraim@flashner.co.il> skribis:

> On Wed, 03 Feb 2016 09:47:15 +0100
> ludo@gnu.org (Ludovic Court=C3=A8s) wrote:

[...]

>> This will trigger rebuilds (but with an identical result) because in
>> manually-written variants we would use =E2=80=9Cpython2-foo=E2=80=9D as =
the label of
>> inputs, whereas the automatic transformations keeps the original
>> =E2=80=9Cpython-foo=E2=80=9D label.
>
> rebuilds python-foo and python2-foo, or just the python2- variants?

The latter.

>> What do people think?
>
> I like it. It keeps the logic in the build-system. In terms of a speed te=
st
> when figuring out the build/dependancy graph, how does it affect the time=
 of
> `guix graph python2-scipy python2-matplotlib`?

It might be slightly faster, but it=E2=80=99s already rather fast.  :-)

--8<---------------cut here---------------start------------->8---
$ time guix graph python2-scipy python2-matplotlib >/dev/null

real	0m0.664s
user	0m0.768s
sys	0m0.056s
--8<---------------cut here---------------end--------------->8---


[...]

>> Does that make sense?  Any takers?  (This can be done incrementally.)
>
> It fits our "one change per commit" policy, and if we don't start at the =
base
> of the pyramid we'll be modifying and then removing the special variants.=
 I
> don't mind doing the conversion process.

OK.

> Thinking aloud, I think for the time being we should keep the
> python-setuptools that are already part of the python- variants where they
> are and save that for another time.

Agreed.

Thanks for your feedback!

Ludo=E2=80=99.