I also started getting them around that time, and it seems unrelated to my usage, eg today I encountered it on the very first prompt of the day after a whole weekend afk.
(Monday morning Australia time, so it was still Sunday in US)
very cool! this article would have saved me quite some time if I discovered it earlier, as I ended up diving into a similar rabbit hole. Still, some useful tips I will incorporate into my emacs workflow, cheers for that.
one thing to add: I recommend piping the output to `xcbeautify` (https://github.com/cpisciotta/xcbeautify) to have sane build output; otherwise it's a mess outside of xcode.
(Monday morning Australia time, so it was still Sunday in US)