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


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

--- Comment #31 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, hjl/pr21740 has been created
        at  21e5ab4dab7412c8516aed07d07da7cdf40ac2fb (commit)

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=21e5ab4dab7412c8516aed07d07da7cdf40ac2fb

commit 21e5ab4dab7412c8516aed07d07da7cdf40ac2fb
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 10 09:24:47 2017 -0700

    More bug fixes

        [BZ #7065]
        [BZ #21740]
        [BZ #21745]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=712e70de9743a61618001b4c6372a0e3d4fc1d90

commit 712e70de9743a61618001b4c6372a0e3d4fc1d90
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 9 08:39:17 2017 -0700

    Remove debug/stack_chk_fail_local.c [BZ #21740]

    Since

    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.

    added

    strong_alias (__stack_chk_fail, __stack_chk_fail_local)

    to debug/stack_chk_fail.c, debug/stack_chk_fail_local.c should be
    removed.  Since dummy __stack_chk_fail and __stack_chk_fail_local
    symbols are used in ld.so, tst-_dl_addr_inside_object should be
    linked with $(dummy-stack-chk-fail).   Tested on x86-64 with
    --enable-stack-protector=all and got

    FAIL: elf/tst-env-setuid
    FAIL: elf/tst-env-setuid-tunables
    FAIL: stdlib/tst-secure-getenv

    which are the same as without this patch.

        * [BZ #21740]
        * debug/Makefile (static-only-routines): Remove
        stack_chk_fail_local.
        * debug/stack_chk_fail_local.c: Removed.
        * elf/Makefile (LDFLAGS-tst-_dl_addr_inside_object): New.

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