They're making pretty significant advances with Clang and LLVM and have pretty much caught up to GCC in performance and surpassed it in usability. So they're no

They're making pretty significant advances with Clang and LLVM and have pretty much caught up to GCC in performance and surpassed it in usability. So they're not doing nothing, for sure. But they're pouring all that effort into Objective-C, which will still has the inherent problem of C compatibility. Granted it's evolving (i.e @import), but it can only go so far without breaking compatibility completely like C# did.