15f7e02940
Thanks to changes to type compatibility rules via WG14 N3007, these functions can now be called with a compatible type even within the same TU, which makes the -Wvisibility diagnostic too chatty to have on by default. So in C23 mode, -Wvisibility will only diagnose an incomplete tag type declared in a function prototype. If the tag is defined in the prototype, the diagnostic is silenced.