The last check was in 2016:
https://www.viva64.com/en/b/0446/ . Yes, it was few years ago because we were not interested in writing the same articles again and again. There are a lot of other interesting projects in the world:
https://www.viva64.com/en/inspections/ . I also want to note that you assume that Clang was worse than PVS-Studio long time ago but now it can catch up. To that, I will say that all these years we’ve been working on analyzer development :). By the way, here is where you can read about the way it works: "Technologies used in the PVS-Studio code analyzer for finding bugs and potential vulnerabilities" -
https://www.viva64.com/en/b/0592/