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Re: Cross-building GuixSD (and maybe using pre-built toolchains)

From: Ludovic Courtès
Subject: Re: Cross-building GuixSD (and maybe using pre-built toolchains)
Date: Thu, 01 Sep 2016 10:17:01 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Hi David,

David Craven <address@hidden> skribis:

>>> So one issue that happens when cross building is for things that have
>>> the #:no-substitutes #t enabled. This is mainly found in service
>>> derivations for generating configuration files.
>> I think there’s currently no easy way to cross build a full GuixSD
>> anyway, like ‘guix system build --target=mips64el-linux-gnu’ (the
>> --target flag doesn’t exist yet).  Or did you experiment in this area?
>> I’d be curious.  It’s designed to allow this (in particular because
>> gexps are cross-compilation-aware), but I’ve never tried.
> I'm currently not trying to cross-compile everything. The
> --system=mips64el-linux gets us pretty far already. The missing parts
> are only the ones where no substitutes are available.

Aaah OK.  That’s not cross-compilation though, so it works if and only
if substitutes are available or builds can be offloaded to a machine of
that architecture.  Otherwise it cannot really work.

Now, in most cases, the tiny Guile derivations created via
‘gexp->derivation’ et al. in GuixSD (e.g., the derivation that builds
the initrd) could use, say, an x86_64 Guile, even if building for
mips64el.  However, it would be difficult to take advantage of this


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