I tried to do the whole process a few times. I managed to resolve all issues I had, but I always have a problem with linking mariadb client. Linker just does not found libiconv functions that should be exported in libiconv library. Path to library that I pass in command line (see guide) is correct, I really don't understand what could be wrong. Any idea what to try?
I also tried with Mysql connector, but it seems there are even more issues when building it for Android than with mariadb client. I also don't understand, why Qt Mysql plugin is available prebuilt for other platforms, but not for Android (not even in commercial version).