[Bug libc/18540] getpass fflush_unlocked namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=18540

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eb1fae6a450b3cce5a75c1ed1a734520c56a6457

commit eb1fae6a450b3cce5a75c1ed1a734520c56a6457
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 17 20:14:18 2015 +0000

    Fix getpass fflush_unlocked namespace (bug 18540).

    The getpass function (XPG3 / XPG4 / UNIX98) calls fflush_unlocked (not
    in any of those standards).  This patch fixes this by making
    fflush_unlocked into a weak alias for __fflush_unlocked and calling
    __fflush_unlocked from getpass.

    Tested for x86_64 and x86 (testsuite, and that disassembly of
    installed stripped shared libraries is unchanged by the patch).

        [BZ #18540]
        * libio/iofflush.c [!_IO_MTSAFE_IO] (__fflush_unlocked): Define as
        strong alias of _IO_fflush.  Use libc_hidden_def.
        * libio/iofflush_u.c (fflush_unlocked): Rename to
        __fflush_unlocked and define as weak alias of __fflush_unlocked.
        Use libc_hidden_weak.
        * include/stdio.h (__fflush_unlocked): Declare.  Use
        libc_hidden_proto.
        * misc/getpass.c (getpass): Call __fflush_unlocked instead of
        fflush_unlocked.
        * conform/Makefile (test-xfail-UNIX98/unistd.h/linknamespace):
        Remove variable.

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

Summary of changes:
 ChangeLog          |   13 +++++++++++++
 NEWS               |    2 +-
 conform/Makefile   |    1 -
 include/stdio.h    |    2 ++
 libio/iofflush.c   |    2 ++
 libio/iofflush_u.c |    6 ++++--
 misc/getpass.c     |    2 +-
 7 files changed, 23 insertions(+), 5 deletions(-)

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