[CMake] add_dependencies: Disallow use with INTERFACE_LIBRARY. WHY?!?

[Roman Bolshakov]

I agree with Andrey, there should be a way to use interface library type with generated headers.




There's a workaround but it involves manual set up of extra dependencies solely for dependency tracking. You have to add dependency between a target which consumes the generated headers and a custom target which directly depends on the output of a custom command along with adding interface library into target_link_libraries of the consumer. Each additional target of the generated headers would require the extra dependency set up.




It would be much more natural to add a dependency between interface library and the custom target. 




Thanks,

Roman
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