Undefined reference to functions in header class? [closed]

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This totally sounds right, so maybe I am misimplimenting this solution, but this didn't solve the problem. I tried the first way (with target_link_libraries), but couldn't get the path right (not sure where it starts looking), so moved on to the second method (add_executable). My CMakeLists.txt now reads: #sweepLaserInterface node add_executable(sweepLaserInterface_node src/sweepLaserInterface.cpp include/sweepLaserInterface/sickLMS115Interface.cpp include/sweepLaserInterface/motorInterface.cpp) target_link_libraries(sweepLaserInterface_node ${catkin_LIBRARIES}) , but I am getting similar (but I don't think exactly the same) errors: http://pastebin.com/KW4shySV

#sweepLaserInterface node add_executable(sweepLaserInterface_node src/sweepLaserInterface.cpp include/sweepLaserInterface/sickLMS115Interface.cpp include/sweepLaserInterface/motorInterface.cpp) target_link_libraries(sweepLaserInterface_node ${catkin_LIBRARIES})

Sorry, I guess you can't do the indenting thing in comments, so I recommented the CMakeLists contents for readability.

please ask c++ questions on programming forums.

Ok, I will next time. When I try to add the libraries to the target_link_libaries line, however, I get the error: /usr/bin/ld: cannot find -linclude/sweepLaserInterface/sickLMS115Interface.cpp /usr/bin/ld: cannot find -linclude/sweepLaserInterface/motorInterface.cpp, or just -l<whatever path="" i="" put="" in="" front="" of="" the="" libraries="">. Do you know what I could be doing wrong here? What directory does the target link libraries command start its search in?

you should link it against a shared object. Not the cpp source.

If you do not yet have the shared object/static object, then use method 2 from the answer.

I'm not sure what you mean by linking it against a shared object (what exactly that would look like), but, as I mentioned, I already tried method 2, and it did not solve the problem. In fact, I believe you originally responded to that with "you have to do both," which you have now deleted and thus thoroughly confused me.