@sbooth, Good - it means I'm not the only one who sees them (on Xcode). Except I'm not on Swift - I'm doing Objective-C stuff. I think the test I did producing sqlite3.o is not really accurate - "Wall" is not turning on "all" warnings (if my memory serves me right). So apparently it is Xcode/clang thing and we have to live with that. ;-) Thank you.