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

[Efraim Flashner]

On Sun, Jul 03, 2016 at 04:51:27PM +0200, Paul Boddie wrote:
> Hello,
> 
...
>
> One thing that looks very promising is the ability to cross-bootstrap the 
> system, and I did manage to get that started for a new architecture (mipsel) 
> by performing some modifications suggested in the documentation [1], running 
> guix-daemon with the --disable-chroot flag, and then running this:
> 
> guix build --target=mipsel-linux-gnu bootstrap-tarballs
> 
> However, not wanting to leave my computer switched on all night, I stopped 
> the 
> build after a while. I can understand the need to bootstrap things like 
> toolchains, but given that I am running Debian which has cross-toolchains for 
> mipsel, I wondered if I could short-circuit this process by employing pre-
> built toolchains. Would this be possible?

I built a set of bootstrap-tarballs on my very underpowered laptop
which took about 15 hours. The longest single package was gcc-4.9, which
took me about 5 hours. On a more powerful machine it should go much
faster.

> Finally, it seems to be the case that the workflow involves building a 
> bootstrapped minimal system and then natively building packages. Or have I 
> misunderstood the process? Is it possible to cross-build all of the packages 
> in the distribution?
> 
> I hope I haven't missed anything that tells me the answers to all of these 
> questions.
> 
> Thanks in advance for any answers you may have!
> 
> Paul
> 
> [1] https://www.gnu.org/software/guix/manual/html_node/Porting.html#Porting
> 

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