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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 #32 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  217275043ad73f922d07f42e5fc1a4be70183209 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=217275043ad73f922d07f42e5fc1a4be70183209

commit 217275043ad73f922d07f42e5fc1a4be70183209
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 9 08:39:17 2017 -0700

    Add __stack_chk_fail_local alias only to libc.so [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.

    unconditionally added

    strong_alias (__stack_chk_fail, __stack_chk_fail_local)

    Since libc.a and libc_nonshared.a has debug/stack_chk_fail_local.c,
    __stack_chk_fail_local alias should be limited to libc.so.

    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/stack_chk_fail.c (__stack_chk_fail_local): Add the
        alias only if SHARED is defined.

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