I tend to use a single compilation unit, and use plain C. For a 50k line project I have build times of 1-1.2sec. On top of that I'm also linking to opengl, windows.h and a couple of headers in the standard lib.
Exactly :) I come from a .net background, where compile times are kinda bad compared to what I get in C. I had also heard of big C++ projects that could take more than 30 mins to build. So I was always scared to move to native code. Until I learned the single compilation unit trick! And if compile times were to get slow again, there are many more ways to bring it down even further,
Since when are .Net compile times worse than c? Csc compiles extremely fast, most long compile times are caused by msbuild doing... not much at all really.
I work on a much bigger project and we use that method (unity builds) - it helps for full builds and on small projects, but it makes incremental changes very slow on bigger projects.