[Bug network/19622] Support aliasing with struct sockaddr

[fw at deneb dot enyo.de]

https://sourceware.org/bugzilla/show_bug.cgi?id=19622

Florian Weimer <fw at deneb dot enyo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |fw at deneb dot enyo.de
   Target Milestone|---                         |2.40

--- Comment #7 from Florian Weimer <fw at deneb dot enyo.de> ---
Fixed for 2.40 via:

commit 8d7b6b4cb27d4dec1dd5f7960298c1699275f962
Author: Florian Weimer <fweimer@redhat.com>
Date:   Sat May 18 09:33:19 2024 +0200

    socket: Use may_alias on sockaddr structs (bug 19622)

    This supports common coding patterns.  The GCC C front end before
    version 7 rejects the may_alias attribute on a struct definition
    if it was not present in a previous forward declaration, so this
    attribute can only be conditionally applied.

    This implements the spirit of the change in Austin Group issue 1641.

    Suggested-by: Marek Polacek <polacek@redhat.com>
    Suggested-by: Jakub Jelinek <jakub@redhat.com>
    Reviewed-by: Sam James <sam@gentoo.org>
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

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