[Bug libc/21745] [powerpc64le] Extra PLT reference with --enable-stack-protector=all

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https://sourceware.org/bugzilla/show_bug.cgi?id=21745

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=61c45f250528dae431391823a9766053e61ccde1

commit 61c45f250528dae431391823a9766053e61ccde1
Author: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Date:   Fri Sep 15 15:07:28 2017 -0300

    [BZ #21745] powerpc: build some IFUNC math functions for libc and libm

    Some math functions have to be distributed in libc because they're
    required by printf.
    libc and libm require their own builds of these functions, e.g. libc
    functions have to call __stack_chk_fail_local in order to bypass the
    PLT, while libm functions have to call __stack_chk_fail.

    While math/Makefile treat the generic cases, i.e. s_isinff, the
    multiarch Makefile has to treat its own files, i.e. s_isinff-ppc64.

        [BZ #21745]
        * sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile:
        [$(subdir) = math] (sysdep_calls): New variable.  Has the
        previous contents of sysdep_routines, but re-sorted..
        [$(subdir) = math] (sysdep_routines): Re-use the contents from
        sysdep_calls.
        [$(subdir) = math] (libm-sysdep_routines): Remove the functions
        defined in sysdep_calls and replace by the respective m_* names.
        * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-ppc64.S:
        (compat_symbol): Undefine to avoid duplicated compat symbols in
        libc.

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

Summary of changes:
 ChangeLog                                          |   14 ++++++++
 sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile   |   36 ++++++++++---------
 .../powerpc64/fpu/multiarch/s_isnan-ppc64.S        |    3 ++
 3 files changed, 36 insertions(+), 17 deletions(-)

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