Re: C++ PATCH: Fix PR 13275

[Mark Mitchell <mark at codesourcery dot com>]

>     #include <stddef.h>
> 
>     struct A {
>        static int a;
>        static A b;
>     };
> 
>     int A::a;
>     A A::b;
> 
>     struct B : A {
>     };
> 
>     int main() {
>        offsetof(A, a);              // should be an ERROR
>        offsetof(B, A::b);            // ditto
>     }

These are both undefined behavior.  No diagnostic is required.

And, if you want an error message, that's easy.  Just modify
cp_parser_postfix_expression to pass in_offsetof_p down to
finish_class_member_access_expr.  That's *exactly the same* work you'd
have to do in builtin_offsetof anyhow.

Since you think arguing about this is a good use of your time, I can
only conclude that V3 is now bug-free and as fast as possible!  I am
overjoyed. :-)

-- 
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC