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Finally I solved the problem using the @dornhege answer and improvising a little. As you may know, you can link libraries with target_link_libraries, but if you want to link a object you must convert first the source (.cc, .cpp, ...) in a library (compiling it) and latter link it with this command.

My problem was that I was trying to link directly a object as if was a library. But, there is any form to link directly a .o file without converting it firstly in a library?

Finally I solved the problem using the @dornhege answer and improvising a little. As you may know, you can link libraries with target_link_libraries, but if you want to link a object you must convert first the source (.cc, .cpp, ...) in a library (compiling it) (creating it with rosbuild_add_library) and latter link it with this command.

My problem was that I was trying to link directly a object as if was a library. But, there is any form to link directly a .o file without converting it firstly in a library?