[obiterdictum]

I like where this is going, but it was a bit unstable for my taste last I tried it. I think it still relies on the file being syntactically correct, which may break your parsing sometimes and is still quite slow with template-heavy code (Boost mostly). Is it still the case?

I'd also like some more build system integration hooks (e.g. provide project-specific include dirs and CXXFLAGS on a per-file basis).

[__rkaup__]

You can provide your own flags to the compiler, in the g:clang_user_options variable. It does still break in uncompilable code but I don't quite see how that's a problem. It forces you to be more disciplined. If you're finding it a bit slow, the help files do explain you how to set up precompiled headers with it. I haven't tried that though, so I can't comment on how much it helps. Personally, the only times a get annoyed with it are when I type 'catch (...', and it thinks I want it's help.