[CMake] How can I tell cpack to build multiple packages?

[Yuri V. Timenkov]

As I understand, CPack.cmake when included into top-level CMakeLists.txt 
produces file CPackConfig.cmake, and cmake when finds this file, generates special 
global target "package".

Is it possible to make several calls to cpack? I want to build different 
packages for different projects/components.

One way to do this is write custom CPackConfig.cmake which does nothing but 
invokes several "execute_process" commands. Are there any other suggestions?

Thanks.