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

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f2225475118c8804b1b31731bdfb3f76eb179e6d

commit f2225475118c8804b1b31731bdfb3f76eb179e6d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon May 23 19:43:09 2016 +0200

    Make padding in struct sockaddr_storage explicit [BZ #20111]

    This avoids aliasing issues with GCC 6 in -fno-strict-aliasing
    mode.  (With implicit padding, not all data is copied.)

    This change makes it explicit that struct sockaddr_storage is
    only 126 bytes large on m68k (unlike elsewhere, where we end up
    with the requested 128 bytes).  The new test case makes sure that
    this does not happen on other architectures.

    (cherry picked from commit 3375cfafa7961c6ae0e509c31c3b3cef9ad1f03d)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                          |   23 ++++
 bits/sockaddr.h                                    |    5 +-
 bits/socket.h                                      |    8 +-
 inet/Makefile                                      |    4 +-
 inet/tst-sockaddr.c                                |  125 ++++++++++++++++++++
 sysdeps/mach/hurd/bits/socket.h                    |    8 +-
 sysdeps/unix/bsd/bits/sockaddr.h                   |    5 +-
 sysdeps/unix/sysv/linux/bits/socket.h              |    8 +-
 .../unix/sysv/linux/m68k/bits}/sockaddr.h          |    5 +-
 9 files changed, 175 insertions(+), 16 deletions(-)
 create mode 100644 inet/tst-sockaddr.c
 copy {bits => sysdeps/unix/sysv/linux/m68k/bits}/sockaddr.h (90%)

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