[Bug c/91285] _Pragma does not work in a useful fashion

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91285

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Isn't it better to do:

# define        ENCLOSING_OBJECT(TYPE, MEMBER, OBJECT)\
        ((void)sizeof (&((TYPE *) 0)->MEMBER - OBJECT),\
        (TYPE *) ((char *) OBJECT - offsetof (TYPE, MEMBER)))

Instead?