C2C is now based on LLVM/Clang 6.0. The port was rather easy and took 20 minutes (excluding time to build LLVM/Clang).
The only nasty thing was a shift in arguments in include/clang/Basic/DiagnosticSemaKinds.def. This gives runtime asserts,
but luckily one of the unit tests broke, so it was very easy to detect and locate.
The performance seems to be the same and I've noticed no other differences. The clang binary does seem to have grown
another 5MB (87 -> 92 MB), all nice features I'm sure
