[Bug build/7065] Support building glibc with -fstack-protector or -fstack-protector-all

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=7065

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The branch, hjl/pr21740 has been created
        at  47d95763a35fbc83ac871b10fc59f9eca1ef0a40 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=47d95763a35fbc83ac871b10fc59f9eca1ef0a40

commit 47d95763a35fbc83ac871b10fc59f9eca1ef0a40
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 9 08:39:17 2017 -0700

    Don't add stack_chk_fail_local.o to libc.a [BZ #21740]

    commit 524a8ef2ad76af8ac049293d993a1856b0d888fb
    Author: Nick Alcock <nick.alcock@oracle.com>
    Date:   Mon Dec 26 10:08:57 2016 +0100

        PLT avoidance for __stack_chk_fail [BZ #7065]

        Add a hidden __stack_chk_fail_local alias to libc.so,
        and make sure that on targets which use __stack_chk_fail,
        this does not introduce a local PLT reference into libc.so.

    which unconditionally added

    strong_alias (__stack_chk_fail, __stack_chk_fail_local)

    defines __stack_chk_fail_local as an alias of __stack_chk_fail in libc.a.
    There is no need to add stack_chk_fail_local.o to libc.a.  We only need
    to add stack_chk_fail_local.oS to libc_nonshared.a.

    Tested on x86-64:

    [hjl@gnu-skl-1 build-x86_64-linux]$ nm libc.a | grep __stack_chk_fail
    0000000000000000 T __stack_chk_fail
    0000000000000000 T __stack_chk_fail_local
    [hjl@gnu-skl-1 build-x86_64-linux]$ nm libc_nonshared.a | grep
__stack_chk_fail_local
    0000000000000000 T __stack_chk_fail_local
    [hjl@gnu-skl-1 build-x86_64-linux]$

        [BZ #21740]
        * debug/Makefile (elide-routines.o): New.

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