[Bug default/29144] abidiff does not report base class reordering

["gprocida at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29144

--- Comment #2 from gprocida at google dot com ---
Hi Dodji.

I think this works, at least to some degree. However, we were wondering if it
would make sense to mention *offsets* rather than just the *order* of base
classes.

There is also a second thing, one which I haven't had time to look into at all,
beyond vaguely remembering the distinction and compiling some code. Something
like the following. Or perhaps with s/class/struct/.

class base { int x; };
class a : base { int y;  };
class b : base { int z; };

class derived : a, b { };

vs

class derived : virtual a, virtual b { };

I wonder if it's possible to get in a situation where layout changes are
missed.

Regards,
Giuliano.

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