[CMake] rebuild_cache does not fully rebuild the cache information

[Bill Hoffman]

On 5/9/2018 4:42 AM, Nils Rathmann wrote:
> Hi,
> when I change the installation of external dependencies, which are 
> located by find_packages, it seems, that it is not enough to run 
> rebuild_cache. The information about external software is not thrown 
> away and rebuild. I have to delete the CMakeCache.txt and rebuild again.
> It this intended? And why is it intended?
> 
> I work with cmake 3.9.1.
rebuild_cache basically just re-runs cmake on the project. It does not 
re-check find_package information.

-Bill