After uploading mariadb-10.5 1:10.5.5-1 to Debian the build still fails with these:
/usr/bin/ld: /usr/include/c++/10/bits/atomic_base.h:464: undefined reference to `__atomic_compare_exchange_1' The odd thing is that an identical build on Ubuntu Groovy passes OK: https://launchpadlibrarian.net/499652421/buildlog_ubuntu-groovy-riscv64.mariadb-10.5_1%3A10.5.5-1~ubuntu20.10.1~1601274184.7ad164279+master_BUILDING.txt.gz
