status of RFNoC Fosphor and build recommendations

[Clint Scarborough]

I'm trying to run GNURadio with the RFNoC Fosphor block.  I first tried 
building UHD 4.4 and GNURadio 3.10 or 3.11.  I had read the Readme for 
gr-ettus that said for GR3.10 to just use gr-uhd directly.  In GNURadio 
Companion, I see most of the UHD blocks, including RFNoC blocks like 
Fosphor, but searching the available blocks for fosphor doesn't give any 
other results - though I believe I need an RFNoC Fosphor display block.  
Am I missing something?

I've also tried going back to GR3.8 (maint-3.8 branch) with UHD4.0 
(UHD-4.0 branch) and gr-ettus (branch maint-3.8-uhd4.0).  However, when 
I do that, I get a bunch of errors when trying to build GR3.8, along the 
lines of the following (failing to convert between boost::shared_ptr and 
std::shared_ptr):


/home/clint/git/gnuradio/build-3.8/gr-uhd/swig/CMakeFiles/uhd_swig.dir/uhd_swigPYTHON_wrap.cxx:38977:66: 
error: invalid ‘static_cast’ from type 
‘SwigValueWrapper<std::shared_ptr<gr::uhd::amsg_source> >’ to type 
‘const sptr&’ {aka ‘const boost::shared_ptr<gr::uhd::amsg_source>&’}

38977 |   resultobj = SWIG_NewPointerObj((new 
gr::uhd::amsg_source::sptr(static_cast< const 
gr::uhd::amsg_source::sptr& >(result))), 
SWIGTYPE_p_std__shared_ptrT_gr__uhd__amsg_source_t, SWIG_POINTER_OWN |  
0 );


(Though some of the errors come from other GR components, but I believe 
they're all related to pointer casting.)  I'm doing this on Ubuntu 
22.04.  I believe I also tried GR3.8 with UHD-4.4 and got the same or 
very similar errors.


So - what is the best way to use the RFNoC Fosphor block at the moment?  
Am I missing something with the latest versions of GR and UHD, or do I 
need to use the older version to get the display block?  If the latter, 
any suggestions for fixing my build errors?


Thanks!

Clint