[USRP-users] How to find and link OOT module with gnuradio 3.8?

[EJ Kreinar via USRP-users]

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

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