> I think the obvious easy solution here is to run a CI that is using
> older stuff, and report problems when commits break that.

Something that's been bouncing around my head:

* archive stage3 files somewhere official

* run a weekly CI job that attempts to upgrade a N-weeks old
  stage3 to current, with "emerge -uDNav world"

* for N=1,2,4,8,16,32 etc

* if it fails, annoy people

Limitations:
1) covers only stage3
2) solutions may not always be obvious
3) culprits may not always be obvious

-- 
Andreas K. Hüttel
dilfri...@gentoo.org
Gentoo Linux developer
(council, toolchain, base-system, perl, libreoffice)

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