From: "Ludovic Courtès" <ludo@gnu.org>
To: Mathieu Othacehe <m.othacehe@gmail.com>
Cc: guix-devel@gnu.org
Subject: Re: Cross-compilation broken on canonical packages.
Date: Mon, 30 Dec 2019 19:48:13 +0100 [thread overview]
Message-ID: <87y2ut645u.fsf@gnu.org> (raw)
In-Reply-To: <87fthc9vav.fsf@gmail.com> (Mathieu Othacehe's message of "Sun, 22 Dec 2019 17:31:04 +0100")
Hi,
Mathieu Othacehe <m.othacehe@gmail.com> skribis:
>> This is expected: packages in ‘%final-inputs’ (those returned by
>> ‘canonical-package’) are rooted in the bootstrap graph and cannot be
>> cross-compiled.
>
> Looking at canonical-package in (gnu packages commencement), I see that
> there's already a switch on (%current-target-system). The given package
> is directly returned if (%current-target-system) is set, which appears
> to be what we want!
>
> ;; In general we want CANON, except if we're cross-compiling: CANON
> ;; uses explicit inputs, so it is "anchored" in the bootstrapped
> ;; process, with dependencies on things that cannot be
> ;; cross-compiled.
> (if (%current-target-system)
> package
> canon))
>
>
> But, this doesn't work as expected. I guess it is because of
> (%current-target-system) evaluation time.
Ah yeah. The hack works when you use ‘canonical-package’ in a package
input, because package input fields are “thunked”, so they’re evaluated
in a dynamic context where ‘%current-target-system’ has the right value.
However, the hack doesn’t work for things like the ‘packages’ field of
<operating-system> because it’s not a thunked field.
Two simple solutions here, I think:
1. Make ‘packages’ a thunked field.
2. Stop using ‘canonical-package’ altogether in ‘%base-packages’.
I actually have a preference for #2. We’d need to check what impact it
has on the system closure size, but I suspect it’s going to be minimal.
Thoughts?
(The <canonical-package> trick you posted should work of course, but
it’s even better if we can avoid it!)
Thanks,
Ludo’.
next prev parent reply other threads:[~2019-12-30 18:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-14 11:49 Cross-compilation broken on canonical packages Mathieu Othacehe
2019-12-14 11:52 ` Mathieu Othacehe
2019-12-19 16:48 ` Ludovic Courtès
2019-12-22 16:31 ` Mathieu Othacehe
2019-12-30 18:48 ` Ludovic Courtès [this message]
2019-12-31 9:55 ` Mathieu Othacehe
2020-01-02 18:07 ` Ludovic Courtès
2020-01-02 22:00 ` Mathieu Othacehe
2020-01-03 12:03 ` Mathieu Othacehe
2020-02-11 13:01 ` Mathieu Othacehe
2020-02-11 14:04 ` Ludovic Courtès
2020-02-12 10:20 ` Mathieu Othacehe
2020-02-24 16:11 ` Ludovic Courtès
2020-03-06 9:19 ` Mathieu Othacehe
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