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RE: Gridcoin wallet 3.7.8 status & compiling on Raspberry Pi
-O2 is optimization level. For nano you can quickly replace it wit ^W^R-O2^M-O0 -g^Ma, the fact that it does not work with -O2 is a bug in gridcoin, by turning off optimizations, the bug was not triggered. See and please post your findings to Wallet crash on raspberry pi Issue.
Thank you very much @tomasbrod ! This was the discussion what I mentioned in my post :)