Someone just sent a patch this morning upgrading it to Clang 3.7, which is available in the Ubuntu 15.10 repository, but not earlier. There are also official x64 llvm.org binaries for 14.04 that work.

I don't actually use the program on a daily basis, but I do pull it out on special occasions. Most recently I used it while tracking down https://github.com/atom/electron/issues/3380. It's helpful because Electron/Chromium is big and I'm unfamiliar with the code.