[CMake] Linker error with sub project's static libs

[Olaf Peter]

Hello Leif,

 > Are your libraries mutually dependent?  You may be hitting the
 > mutually-dependent static library problem.  Look for the word 
"mutual" near
 > the end of
 > http://www.cmake.org/cmake/help/v3.0/command/target_link_libraries.html,
 > that section explains some of what is going on.

yes it is mutually, ui_lib creates a SchematicView, which is derived 
from GraphicView. SchematicView's instance is in ui_schematic_lib, where 
GraphicsView is in ui_lib. Probably I should stay the files inside these 
directory and add them to the source in ui_lib project as the docs 
suggested.

Thanks,
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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