[CMake] cmake and buildvariants

[John Beuving]

I have the following software setup where I need to have build variants 
providing different builds for the same (sub)project

-    worker ( calls the Qt Processevents function if Qt is enabled for 
this project (#define  USE_WORKER_QT)
-    gui app (uses Qt)
-    console app (normal application used for data export)


So the gui application uses Qt and needs to use the worker static 
library with the define USE_WORKER_QT set
and the console application needs a variant build of the worker library 
where USE_WORKER_QT is not set.

How can I achieve this. Is this even possible with cmake ??

John