[Bug libc/18520] h_errno namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=18520

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9acacaa02f3b75fddc07a56f3d848df45281a5de

commit 9acacaa02f3b75fddc07a56f3d848df45281a5de
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Jun 12 10:10:18 2015 +0000

    Fix h_errno namespace (bug 18520).

    The 2008 edition of POSIX removed h_errno, but some functions still
    bring in references to the h_errno external symbol.  As this symbol is
    not a part of the public ABI (only __h_errno_location is), this patch
    fixes this by renaming the GLIBC_PRIVATE TLS symbol to __h_errno.

    Tested for x86_64 and x86 (testsuite, and comparison of installed
    shared libraries).  Disassembly of all shared libraries using h_errno
    changes because of the renaming (and changes to associated TLS / GOT
    offsets in some cases); disassembly of libpthread on x86_64 changes
    more substantially because the enlargement of .dynsym affects
    subsequent addresses.

        [BZ #18520]
        * inet/herrno.c (h_errno): Rename to __h_errno.
        (__libc_h_errno): Define as alias of __h_errno not h_errno.
        * include/netdb.h [IS_IN_LIB && !IS_IN (libc)] (h_errno): Define
        to __h_errno instead of h_errno.
        * nptl/herrno.c (h_errno): Rename to __h_errno.
        (__h_errno_location): Refer to __h_errno not h_errno.
        * resolv/Versions (h_errno): Rename to __h_errno.
        * conform/Makefile (test-xfail-XOPEN2K8/grp.h/linknamespace):
        Remove variable.
        (test-xfail-XOPEN2K8/pwd.h/linknamespace): Likewise.

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

Summary of changes:
 ChangeLog        |   14 ++++++++++++++
 NEWS             |    3 ++-
 conform/Makefile |    2 --
 include/netdb.h  |    2 +-
 inet/herrno.c    |    4 ++--
 nptl/herrno.c    |    4 ++--
 resolv/Versions  |    2 +-
 7 files changed, 22 insertions(+), 9 deletions(-)

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