[Bug libc/20111] struct sockaddr_storage cannot be aggregate-copied

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20111

--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to rguenther from comment #4)

> The way to tell GCC this is to  mark all members of that "implicit" union
> with the may_alias attribute.

If I do this, I get:

t.c:12:38: warning: ignoring attributes applied to ‘struct first’ after
definition [-Wattributes]
   __attribute__ ((may_alias)) struct first f;

We cannot put the may_alias attribute on the struct definition because it
breaks forward declarations (see bug 19622).

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