From: "Ludovic Courtès" <ludo@gnu.org>
To: 38100@debbugs.gnu.org
Subject: bug#38100: ‘--with-input’ causes unintended rebuilds
Date: Fri, 08 Nov 2019 22:06:32 +0100 [thread overview]
Message-ID: <87ftiydqnb.fsf@gnu.org> (raw)
In-Reply-To: <87eeyjsw3g.fsf@inria.fr> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22\?\= \=\?utf-8\?Q\?'s\?\= message of "Thu, 07 Nov 2019 13:35:15 +0100")
Hi,
Ludovic Courtès <ludovic.courtes@inria.fr> skribis:
> Indeed, evaluating:
>
> (bag-transitive-inputs
> (package->bag ((package-input-rewriting '()) glib)))
>
> shows that we have two “python” packages there that are not ‘eq?’.
The problem is that ‘glib’ depends on ‘python-libxml2’, which uses
‘python-build-system’ and thus has ‘python’ as an implicit input.
‘package-input-rewriting’ doesn’t touch implicit inputs so it leaves
that implicit ‘python’ untouched.
Since ‘transitive-inputs’ (used by ‘bag-transitive-inputs’) uses pointer
equality, we end up with two “python” packages that are not ‘eq?’ but
are functionally equivalent: the one produced by
‘package-input-rewriting’, and the implicit dependency of
‘python-libxml2’. QED.
(This is essentially the same as <https://bugs.gnu.org/30155>.)
I’m not sure how to address it.
Ludo’.
next prev parent reply other threads:[~2019-11-08 21:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-07 12:35 bug#38100: ‘--with-input’ causes unintended rebuilds Ludovic Courtès
2019-11-08 21:06 ` Ludovic Courtès [this message]
2020-09-27 21:46 ` Ludovic Courtès
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://guix.gnu.org/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87ftiydqnb.fsf@gnu.org \
--to=ludo@gnu.org \
--cc=38100@debbugs.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/guix.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).