I might misunderstand what kind of warnings you are talking about, but I saw OP talking about compiler warnings during the build process and you about GTK appli

I might misunderstand what kind of warnings you are talking about, but I saw OP talking about compiler warnings during the build process and you about GTK application runtime warnings. They are different, and in the context of an application it's... well, not necessariliy good, but normal. Runtime warnings and unexpected input is at least input the programmer is aware of. I'd be more scared of an app that lacks runtime warnings.