[CMake] This has to have been asked before...

[Oliver Smith]

I'm probably not using the right keywords on my search.

I want to add a target (a gcc precompiled header) as a dependency for 
every target so it'll get compiled with the flags for that particular 
target, including altering the resulting file name.

I did try looking at the precompiled header CMake include, but that just 
confused the bejeezus out of me, not helped by the fact that it didn't 
work :)

- Oliver