[Bug libc/18545] mq_receive, mq_send mq_timed* namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=18545

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c21d37deb268afc45fbc5bba1a97f87afd0bf656

commit c21d37deb268afc45fbc5bba1a97f87afd0bf656
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 17 20:17:49 2015 +0000

    Create hidden aliases for non-libc syscalls automatically.

    The syscall wrappers mechanism automatically creates hidden aliases
    for syscalls with libc_hidden_def / libc_hidden_weak.  The use of
    libc_hidden_* has the side-effect that for syscall wrappers in
    non-libc libraries those aliases are not created.  In turn, this means
    that three mq_* syscalls in sysdeps/unix/sysv/linux/syscalls.list list
    the __GI_* names explicitly.

    The use of libc_hidden_* dates back to the original introduction of
    that support in

    2002-08-03  Roland McGrath  <roland@redhat.com>

            * sysdeps/unix/make-syscalls.sh: Generate libc_hidden_def or
            libc_hidden_weak for every system call symbol defined.

    (predating the non-libc syscalls in question) and I see no reason for
    excluding non-libc syscalls.  This patch changes the code to use
    hidden_def / hidden_weak (via a wrapper syscall_hidden_def in the case
    where the argument is itself a macro, so that the argument gets
    expanded before concatenation with __GI_), so avoiding the need to
    specify the hidden aliases explicitly in this case.

    Tested for x86_64 and x86 (testsuite, and that disassembly of
    installed stripped shared libraries is unchanged by the patch; the
    mq_* symbols change from weak to strong, which is of no significance
    and two of them will shortly change back to weak as part of a fix for
    bug 18545).

        * sysdeps/unix/make-syscalls.sh (emit_weak_aliases): Use
        hidden_def and hidden_weak instead of libc_hidden_def and
        libc_hidden_weak.
        (top level): Refer to hidden_def in comment.
        * sysdeps/unix/syscall-template.S (syscall_hidden_def): New
        macro.  Use it instead of libc_hidden_def.
        * sysdeps/unix/sysv/linux/syscalls.list (mq_timedsend): Do not
        specify __GI_* name explicitly.
        (mq_timedreceive): Likewise.
        (mq_setattr): Likewise.

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

Summary of changes:
 ChangeLog                             |   11 +++++++++++
 sysdeps/unix/make-syscalls.sh         |    6 +++---
 sysdeps/unix/syscall-template.S       |    5 ++++-
 sysdeps/unix/sysv/linux/syscalls.list |    6 +++---
 4 files changed, 21 insertions(+), 7 deletions(-)

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