[lmitchell]

Seconded this, this is my setup on both Windows and Linux and works for me across multi-million-line C and C++ codebases. It's quite finicky to get set up on Windows at first (or at least, it was for me last time I tried), but once you have irony-mode working with libclang, you don't need to think about it ever again, except for changing a couple compiler flags here and there.

My one complaint is that clang's MSVC mode is imperfect, and sometimes suggests some strange things (or produces some false negative/positive in syntax checking). But they've been getting much better lately and it's never caused me much pain.

e: also, second what a sibling said - combo this with flycheck-mode and you have yourself a full-blown C++ IDE in emacs ;)