https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107844
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The reason why is folded is because some folks use the null pointer for offsetof (previously before GCC added __builtin_offsetof). I wonder if you could use __builtin_offsetof here. I also curious how this is implemented in clang ...
