Increase project build speed

[Athalhard]

IMO build is very slow. Ok, I've built it on slow PC (Atom N570), but building other games with cmake was much faster (e.g. Jedi knight).

I'm new to cmake, but I've a feeling that incremental build is off and/or some other optimizations are not applied.

Although it may not be top priority, IMO build speed is essential for all devs, especially for who can dedicate limited time to game development. Because, hey, before I can contribute, I should get the latest version and build it, and development goes very fast here :)

P.S. I'll look into this as well, and update this issue with more details if any.

[dalerank]

Thanks, i think about. 2-3 minutes for full comilation on my i3
but i really dont know how increase building speed. I can hope than precompiled headers may insrease this, but i not testing this yet.