-Winconsistent-missing-override

clang 3.6 added a new warning to -Wall that warns if a class:
- uses 'override' for some of its methods and
- has methods that override base class methods but aren't marked override.

there are a lot classes with this issue. you maybe want to fix this warnings

Thanks for the heads-up, that sounds like a great warning, and we'll certainly fix anything we can find that causes it!