core-updates-frozen: Planning for the last world rebuild

[Ludovic Courtès]

Hello Guix!

Wouldn’t it be nice to get ‘core-updates-frozen’ merged?  :-)

What about merging the patches blocked by
<https://issues.guix.gnu.org/50358>?  We could even have them on a
separate branch, have Cuirass build it, and merge it 24–36h later, at
which point substitute coverage should be reasonably good.

I haven’t followed the new ports, POWER9 and RISC-V.  If there’s
anything needed in this area, like localized toolchain changes, please
send a heads-up!

As I say every time someone proposes a new port, the main issue is not
the port itself but maintaining it longer-term.  And here it’s not even
clear to me what the status of POWER9 is on ‘core-updates-frozen’, so
it’d be great to get feedback on this, ensure Cuirass builds it, and so
on.

Thanks,
Ludo’.