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


From: David Craven
Subject: Re: Cross-building GuixSD (and maybe using pre-built toolchains)
Date: Thu, 1 Sep 2016 00:01:25 +0200

Hi Ludo,

>> 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.

What I've done so far is remove grub from the system/vm.scm file which
is added as a hard dependency (even when run with --no-grub). That
gets guix system build arm-minimal.scm --system=armhf-linux to
download all the substitutable dependencies but then fails at the end.

The other thing I've tried is guix system vm arm-minimal.scm
--system=armhf-linux. This fails when it tries to fetch
gstreamer-plugins-bad. This is required to build spice-gtk-viewer
which is required to run the tests for spice. This looks like qemu is
added as an input somewhere when it should be a native-input.

Other than these two issues I don't think that getting guixsd arm
running in qemu is too far off. This of course doesn't help
bootstrapping a new architecture, but it's nice for developers to be
able to test stuff on arm or mips.

Thanks,
David



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