On Okt 05 2017, Bernd Edlinger <bernd.edlin...@hotmail.de> wrote: > The idea for this warning came up when someone spotted a place in > openssl, where a type cast was used to change the return value of a > callback function from long to int: > > https://github.com/openssl/openssl/issues/4413 > > But due to the type cast there was never ever any warning from this > invalid type cast.
Note that the type cast itself is perfectly valid (all function pointers are alike), but it's the call site that is problematic: unless it casts back to the real type of the function before the call it is causing undefined behviour. Andreas. -- Andreas Schwab, SUSE Labs, sch...@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."
