Thank you! I've never seen that page. It doesn't show up when searching for "clang warnings" in DuckDuckGo or Bing, but I see now that it is Google's result #2.
I just found a GitHub repo that lists which warning flags are supported by different versions of clang and gcc:
I just found a GitHub repo that lists which warning flags are supported by different versions of clang and gcc:
https://github.com/Barro/compiler-warnings