bug#47964: webkitgtk-2.32.0 build fails

[Leo Famulari]

On Mon, Apr 26, 2021 at 09:58:36AM -0400, Bone Baboon wrote:
> `guix build --no-substitutes --cores=1 --max-jobs=1 webkitgtk`
> `sudo guix system --no-substitutes --cores=1 --max-jobs=1 reconfigure 
> configuration.scm`
> These two commands fail to build webkitgtk with the error message
> reported previously.  The problem being what you have identified (using
> one core).
> 
> `sudo guix system --no-substitutes reconfigure configuration.scm`
> Fails to build webkitgtk because of what looks like an out of memory
> issue.  With "oom_reaper" showing up in /var/log/messages.
> 
> `sudo guix system --no-substitutes --cores=2 --max-jobs=1 reconfigure 
> configuration.scm`
> This command was successfully able to build webkitgtk.

Thanks for taking the time to perform all these builds; I'm sure they
took a long time.

I'm guessing that "--cores=2 --max-jobs=1" used fewer threads than the
guix-daemon would normally choose by default on your computer? Like,
maybe you have 4 cores / hyperthreads or something like that?

It's unusual that a program requires multithreaded compilation, but I
wonder if we can add a property to the package definition to require at
least 2 threads when building.