When trying to write an OOT block for Gnuradio, I ran cmake ../, and then make. The make process successfully builds some objects, but when it gets to the step:
Linking CXX executable test-XXXXXXXX
there is the problem:
libgnuradio-XXXXXXXX.so: undefined reference to 'YYYYYYYY'
YYYYYYYY is a function defined in a .cc file, which I add to the _impl.cc for the block using a header. This source is apparently not being found, despite being in the same source directory as the _impl.cc file.
Cmake explicitly warns not to make any modifications to the generated Makefile, and it is a fairly complex makefile anyway, so I would be hesitant to try messing with it. Is there another way to direct make to include that additional source when linking?
Your best bet is to look at the CMakeLists.txt at the top of your OOT folder. It is most likely that you are seeing a link problem and that a package dependency is not satisfied. The cmake find_package utility can be used to determine if a dependency is available on the system. If you look at the cmake/Modules directory under the main OOT folder, there should be a couple of examples. Cmake ships with many modules so it's likely what you need will exist.
By adding some find_package logic to the main CMakeLists.txt file, and then blowing away the build directory and making it again and executing "cmake ../", the dependency issue should be apparent. Put another way, whatever libgnuradio-*.so thinks is missing must belong to a package that is not installed on your system. Using find_package will confirm it, and then the answer is to install it.
Look at some other CMakeLists.txt files, say, in gr-digital, for find_package examples.