Hello Marcel,
Olaf,

Unless your code snippets are incomplete, I'm missing the following
statement in ./source/eea/ui/CMakeLists.txt

     target_link_libraries(eea_ui_lib
         eea_ui_schematic_lib)

I'm not sure this is causing the link error, but it's worth a try.
thank you a lot, this solves the linker problem - I have to add these twice, reference to the other lib each time.

Furthermore, I think the order of add_subdirectory(), add_library(), and
target_link_libraries() is important. You might want to check those as well.
The order matches of course, but I haven't never such linker problems. The first time I'm using target_link_lib for a library self. The reason is not clear for me. What happens under the hood here?

Thanks,
Olaf

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