[CMake] CPack: Create debian packge for each sub-project

[DKLind]

I have a large project and I need to create a Debian package for each
sub-project (essentially each add_subdirectory).

I have been experimenting with CPack components as outlined here:
https://cmake.org/cmake/help/v3.8/module/CPackComponent.html?highlight=cpack_components_grouping#variable:CPACK_COMPONENTS_GROUPING

I haven't been able to get any CPACK_DEBIAN_<COMPONENT>_PACKAGE_XXX
variables to work. I've been using the syntax
CPACK_DEBIAN_${PROJECT_NAME}_PACKAGE_XXX.

I'm calling install as:
install(TARGETS ${PROGRAM_NAME} DESTINATION lib COMPONENT ${PROGRAM_NAME})
This way each sub-project is a unique component.

I would expect that CPackConfig.cmake would contain an entry for each
CPACK_DEBIAN_<COMPONENT>_PACKAGE_XXX variable. But, I'm seeing only
variables for the last sub-project that called "include(CPack)".

Here are my requrements:
1. Each package must have a unique control file info (version, description,
etc).
2. Each package filename must be
${PROGRAM_NAME}_${VERSION}_${ARCHITECTURE}.deb



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