Re: How to find and link OOT module with gnuradio 3.8?

[Ron Economos]

I filed an issue on this over a year ago. I'm not sure if it was ever 
fully resolved.

https://github.com/gnuradio/gnuradio/issues/2429

Ron

On 6/30/20 07:00, EJ Kreinar wrote:
> Hi gnuradio and usrp-users,
>
> I'm trying to update rfnoc OOT modules for gnuradio 3.8 (gasp).
>
> But I'm having trouble finding and linking to gr-ettus specifically, 
> and I wonder how we're supposed to call find_package(<OOT>) and then 
> link to OOT modules in general with the updated cmake workflow... 
> Trying to find and link gr-ettus, I've tried a few things...
>
> 1) find_package(ettus)
>
> I believe this worked against gnuradio-3.7. Now, I get the following 
> error during cmake configure...
>
> ```
> --   No package 'ettus' found
> CMake Error at /usr/local/lib/cmake/ettus/ettusConfig.cmake:41 (include):
>   include could not find load file:
>     /usr/local/lib/cmake/ettus/ettusTarget.cmake
> ```
>
> 2) find_package(gnuradio-ettus)
>
> This seems more promising, since GR_LIBRARY_FOO seems to 
> install gnuradio-ettus cmake files into the lib/cmake/ettus install 
> location. This fails in cmake configure with the following error:
>
> ```
> CMake Error at gr-theseus/CMakeLists.txt:84 (find_package):
>   By not providing "Findgnuradio-ettus.cmake" in CMAKE_MODULE_PATH this
>   project has asked CMake to find a package configuration file provided by
>   "gnuradio-ettus", but CMake did not find one.
>
>   Could not find a package configuration file provided by "gnuradio-ettus"
>   with any of the following names:
>
>     gnuradio-ettusConfig.cmake
>     gnuradio-ettus-config.cmake
>
>   Add the installation prefix of "gnuradio-ettus" to CMAKE_PREFIX_PATH 
> or set
>   "gnuradio-ettus_DIR" to a directory containing one of the above 
> files.  If
>   "gnuradio-ettus" provides a separate development package or SDK, be 
> sure it
>   has been installed.
> ```
>
>
> Interestingly, if I change the GR_CMAKE_DIR *inside gr-ettus* to 
> point to 
> ${CMAKE_MODULES_DIR)/gnuradio-ettus (https://github.com/EttusResearch/gr-ettus/blob/b69260655e974786ea6e611bd91ab578b13ec72a/CMakeLists.txt#L69), 
> then the gnuradio-ettus cmake modules get installed to 
> lib/cmake/gnuradio-ettus. Then, in my OOT module, calling 
> find_package(gnuradio-ettus) finds gr-ettus, and 
> target_link_libraries(<my-library> gnuradio-ettus) links successfully.
>
> So: Is this right? Am I missing something obvious here? Should 
> gnuradio OOT modules set their GR_CMAKE_DIR to gnuradio-<module>?
>
> Thanks for the help!
> EJ