[Bug libc/17719] [x86_64] memrchr namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=17719

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=380292ba8b97c82a8ede3ed35f6a3c42b7b47466

commit 380292ba8b97c82a8ede3ed35f6a3c42b7b47466
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Dec 16 18:31:31 2014 +0000

    Fix x86_64 memrchr namespace (bug 17719).

    On x86_64, memrchr (not a standard function) is defined as a strong
    symbol, instead of a weak alias of __memrchr as on other
    architectures.  This results in linknamespace test failures from the
    use of __memrchr from dirname.  (Not a conformance issue because of
    the mem* reservation, but contrary to glibc conventions.)  This patch
    makes x86_64 follow other architectures by defining memrchr as a weak
    alias.

    Tested for x86_64 (testsuite, and that disassembly of installed shared
    libraries is unchanged by the patch).

        [BZ #17719]
        * sysdeps/x86_64/memrchr.S (memrchr): Rename to __memrchr and
        define as weak alias of __memrchr.
        (__memrchr): Do not define as strong alias of memrchr.
        * conform/Makefile (test-xfail-XPG4/libgen.h/linknamespace):
        Remove variable.
        (test-xfail-UNIX98/libgen.h/linknamespace): Likewise.
        (test-xfail-XOPEN2K/libgen.h/linknamespace): Likewise.
        (test-xfail-XOPEN2K8/libgen.h/linknamespace): Likewise.

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

Summary of changes:
 ChangeLog                |   10 ++++++++++
 NEWS                     |    2 +-
 conform/Makefile         |    4 ----
 sysdeps/x86_64/memrchr.S |    6 +++---
 4 files changed, 14 insertions(+), 8 deletions(-)

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