Hi Christian,
I tried to compile your test program with the 19.05 Genode tool chain and got the same error. Does it happen only with gcc 10.3 for you?
hm, this is the code from gccgo libgo version 10.3 for older related to 19.5 (gcc 8.3) may be the code do not contain it, need to check more carefully…
will try to check later today
Sincerely, Alexander