[Bug network/18532] gethostbyaddr in6addr_any, in6addr_loopback namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=18532

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=17c199ee92e4ca8a34a47c42924608a25a444eb2

commit 17c199ee92e4ca8a34a47c42924608a25a444eb2
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 17 20:08:22 2015 +0000

    Fix gethostbyaddr in6addr_any, in6addr_loopback namespace (bug 18532).

    gethostbyaddr brings in references to in6addr_any and thereby
    in6addr_loopback, which aren't in all the standards containing
    gethostbyaddr (gethostbyaddr is in XPG4 and UNIX98, in6addr_any and
    in6addr_loopback are new in POSIX.1:2001).  This patch fixes this by
    making those symbols into weak aliases (safe in this case, unlike for
    most data symbols, because these data symbols are const).

    Tested for x86_64 and x86 (testsuite, and comparison of disassembly of
    installed stripped shared libraries).  Disassembly is unchanged for
    x86_64; for x86, I see some changes of stack offsets, but no other
    code generation changes or code size differences.

        [BZ #18532]
        * inet/in6_addr.c (in6addr_any): Rename to __in6addr_any and
        define as weak alias of __in6addr_any.  Use libc_hidden_data_weak.
        (in6addr_loopback): Rename to __in6addr_loopback and define as
        weak alias of __in6addr_loopback.  Use libc_hidden_data_weak.
        * include/netinet/in.h (__in6addr_loopback): Declare.  Use
        libc_hidden_proto.
        (__in6addr_any): Likewise.
        * inet/gethstbyad_r.c (PREPROCESS): Use __in6addr_any instead of
        in6addr_any.
        * conform/Makefile (test-xfail-XPG4/netdb.h/linknamespace): Remove
        variable.
        (test-xfail-UNIX98/netdb.h/linknamespace): Likewise.

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

Summary of changes:
 ChangeLog            |   16 ++++++++++++++++
 NEWS                 |    2 +-
 conform/Makefile     |    2 --
 include/netinet/in.h |    4 ++++
 inet/gethstbyad_r.c  |    2 +-
 inet/in6_addr.c      |   12 ++++++++----
 6 files changed, 30 insertions(+), 8 deletions(-)

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