Following in the steps of bug #326561, I'm requesting invalid global USE flags also get a warning. This is not only consistent with bug #32561, but also consistent with the 'man make.conf' page which mentions specific allowable USE flags. This will cause problems for some odd USE flags, like LINGUAS, but they can either be added or allowed based on regex checks. I've volunteered to write the patch, if someone else doesn't do it first. Two problems with me doing it: I won't get around to it for a while, and I'm not a portage guru yet. So, if anyone else can do it, please do. :) Reproducible: Always Steps to Reproduce:
In my original comment, "bug #32561" should say "bug #326561".