NONSTANDCAST

Message        <Context> "<expression>" of type "<type>", is being
               converted to "<target type>".  Such a cast is not
               permitted by the standard.

Description    The standard only permits casts from a pointer to an
               object incomplete type to another pointer to an
               object or incomplete type, or from a pointer to
               function type to another pointer to function type.
               Note that void is considered an incomplete type, so
               casts between pointer to void and pointer to function
               types are not permitted by the C standard.

User Action    Be aware of this difference if you plan to port this
               source to another compiler.