[Bug build/21314] Compile Error GCC 5.2.0 MIPS with -0s

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https://sourceware.org/bugzilla/show_bug.cgi?id=21314

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f1d7368196e27370dcb5dfa3319e102f33b9ad66

commit f1d7368196e27370dcb5dfa3319e102f33b9ad66
Author: Carlos O'Donell <carlos@redhat.com>
Date:   Thu Feb 1 20:40:48 2018 +0000

    Fix -Os log1p, log1pf build (bug 21314).

    As reported in bug 21314, building log1p and log1pf fails with -Os
    because of a spurious -Wmaybe-uninitialized warning (reported there
    for GCC 5 for MIPS, I see it also with GCC 7 for x86_64).  This patch,
    based on the patches in the bug, fixes this using the DIAG_* macros.

    Tested for x86_64 with -Os that this eliminates those warnings and so
    allows the build to progress further.

    2018-02-01  Carlos O'Donell  <carlos@redhat.com>
            Ramin Seyed-Moussavi  <lordrasmus@gmail.com>
            Joseph Myers  <joseph@codesourcery.com>

        [BZ #21314]
        * sysdeps/ieee754/dbl-64/s_log1p.c: Include <libc-diag.h>.
        (__log1p): Disable -Wmaybe-uninitialized for -Os around
        computation using c.
        * sysdeps/ieee754/flt-32/s_log1pf.c: Include <libc-diag.h>.
        (__log1pf): Disable -Wmaybe-uninitialized for -Os around
        computation using c.

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

Summary of changes:
 ChangeLog                         |   12 ++++++++++++
 sysdeps/ieee754/dbl-64/s_log1p.c  |   12 +++++++++++-
 sysdeps/ieee754/flt-32/s_log1pf.c |   17 +++++++++++++++--
 3 files changed, 38 insertions(+), 3 deletions(-)

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