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@William had a good answer here: https://answers.ros.org/question/206363/rqt-plugin-undefined-symbol/

By default, the linker doesn't check that shared libraries are linked correctly, so it doesn't display much useful information upon failure. You can change that by setting the linker flag:

set(CMAKE_CXX_FLAGS "-Wl,--no-undefined")

Then you should get much more detailed error messages.

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