https://gcc.gnu.org/bugzilla/show_bug.cgi?id=2803
--- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #14) > I think longlong.h uses these heavily and there are many copies of that. > The casts serve as (admittedly ugly) type verification. Yes it still does. Though since clang never implemented this for their c front-end, I would assume someone has made the necessary changes somewhere. I think there is a branch for glibc which is done to compile with clang with some of the needed changes.