Hi,

Christopher Baines <mail@cbaines.net> skribis:

> One thing that I was aware of before the recent core-updates merge was
> that the Guix Data Service [1] didn't generate derivations for systems
> other than x86_64-linux and i686-linux, at least to the same extent as
> the master branch before the recent core-updates merge.

Indeed, see this bug fix that landed before the merge:

  https://git.savannah.gnu.org/cgit/guix.git/commit/?id=bc60349b5bc58a0b803df5adce1de6db82453744

> I think this is down to the use of package-transitive-supported-systems
> within the Guix Data Service, but the output of this function for a
> package can also be seen by running guix package --show.

The patch below fixes ‘guix show’ but it has a noticeable performance
impact that makes me thing something’s not quite right with memoization
in ‘package-transitive-supported-systems’: