[CMake] Is there a way to customize the generate step trigger?

[Ulrich Hierl]

Hi folks,

my cmake code reads version tags from the underlying git repository, 
derives a new version with the help of the existing tags and then sets 
that new version to the project() call. However, the cmake generate step 
is not triggered when the version tags in the repository change, so the 
version that is compiled into the project is not always up-to-date. So I 
was wondering if CMake offers the possibility to customize the 
up-to-date check of the generate step, to make it automatically re-run 
when the tags in the repository are changed?

Thank you for your time.