[CMake] Determine which files have changed during a CMake run

[Michael Jackson]

Is there a way to determine which files in my build directory have 
changed for a given run of CMake? The use case is that I made what I 
thought was a small change to my configuration using cmake and when I 
went to build it was basically a full recompile. During our cmake run we 
do use configure_file(...) to generate headers and sources some of which 
basically get included in every source file. I am thinking that I have a 
dependency on generating those files when I probably do not have to.

I use Ninja as my build system if that helps. I could always just hack a 
local git repo for the build folder, commit everything, run cmake and 
see what got changed. Anybody have a better idea?

Thanks

-- 
Mike Jackson  [mike.jackson at bluequartz.net]