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Re: State of the powerpc64le port

From: dftxbs3e
Subject: Re: State of the powerpc64le port
Date: Tue, 19 Nov 2019 01:33:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2


For your information, I already did proceed to porting to powerpc64le-linux some time ago.

Here's where my work is :

The `core-updates` branch contains the latest changes, you can also observe CI pipelines to get build logs for both GNU Guix itself (succeeds) and GNU Hello from within GNU Guix (fails). e.g.

I also host bootstrap binaries over Git LFS at

I even set up Gitlab CI to build a container image so anyone can get to work quickly : (updated on every commit to my modified `core-updates`)

What is missing now is that due to a change in the double precision floating point format in glibc >= 2.26, the bootstrap gcc (4.9.x) cannot build the latest glibc included in GNU Guix.

The solution would be to modify the bootstrap process so the bootstrap gcc is used this way :

  1. Use gcc 4.9.x built with glibc 2.25 to build gcc >= 6.2 built with glibc 2.25
  2. Use gcc >= 6.2 built with glibc 2.25 to build gcc >= 6.2 built with glibc >= 2.26

Then the final GCC can be used to build the rest of GNU Guix.

After this, everything should work fine.

On 11/19/19 1:07 AM, Jonathan Brielmaier wrote:
Hello fellow Guix hackers,

recently I just gave the powerpc64le-linux thing another try, as I'm
missing Guix to much on my main machine (POWER9)...

Work is happening on a personal branch. It still in a WIP state and
force-pushing can occur:

As a first step we need the bootstrap-binaries for powerpc64le. This
became pretty simple now. Apply

  gnu: Let cross-gcc-arguments built for powerpc64le.

on a x86_64 system and run:
./pre-inst-env guix build --target=powerpc64le-linux-gnu bootstrap-binaries

I uploaded the resulting tarballs to my private web server. They can be
found here:

On a powerpc64le system you need one commit, in order to get guix
building from the git repo:

  WIP: gnu: Add bootstrap-binaries for 'powerpc64le-linux'.

When this succeeds you should be able to build packages. At the moment
`./pre-inst-env guix build hello` fails while building
gcc-cross-boot0-7.4.0. See the gcc-cross-boot0-7.4.0-buildlog.bz2

Because of that, one is not able to install any packages yet, but
commands like `guix search` or `guix show` already working like a charm :)

So I wonder if we could already bring some of those commits to master or
core-updates :P

That's it for now

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