Looks like code gen issue with the backend compiler. Some label is getting used without being declared. Unfortunately we’ll need a reproducer in order to investigate. You might try removing “-g” or going to a higher opt level like -O2 or -O3 to see if it get optimized away.
I had conflict so wasn’t able to mentor at the NERSC hackathon, but Brent from my team (NV HPC) will be there, though he tends to avoid C++.