[cmake-developers] Making ninja -t clean support ADDITIONAL_MAKE_CLEAN_FILES

[Stephen Kelly]

Hi,

I pushed suppress-unused-cli-with-value-in-cache to my clone. It was failing 
dashboard tests last week because, I think, ctest runs on dirty build dirs 
in the continuous tests. 

As a solution I added the CMakeCache.txt to ADDITIONAL_MAKE_CLEAN_FILES, 
which works fine with the Makefile generator. 

With the Ninja generator, it fails because of 
http://public.kitware.com/Bug/view.php?id=13371. Any idea whether that is 
fixable?

Thanks,

Steve.