Documentation page for CMAKE_CXX_KNOWN_FEATURES extremely difficult to find and not linked to cmake-compile-features(7) documentation.
It's really hard to find the compile feature list, which makes it's really hard to actually use them. Frustratingly, I have forgotten how to find this page like 5 times in the last 9 months and everytime I end up at cmake-compile-features(7), and oddly, there is all this theory about it, but no actual way to get the features to use.
I originally found it in some obscure S.O. answer where someone specifically mentioned how impossibly obscure it was to find it. I concur!