[Bug math/20859] [sh4] FP_ILOGB0 invalid

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https://sourceware.org/bugzilla/show_bug.cgi?id=20859

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c2a82dace432ef59542bcde8ead2a7050fba51c6

commit c2a82dace432ef59542bcde8ead2a7050fba51c6
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Nov 23 21:23:12 2016 +0000

    Fix SH4 FP_ILOGB0 (bug 20859).

    ISO C requires that the value of FP_ILOGB0 must be INT_MIN or
    -INT_MAX.  In sysdeps/sh/sh4/bits/mathdef.h, it's 0x80000001; that is,
    a positive unsigned value that would be -INT_MAX if converted to int,
    which is not valid (there's no actual constraint on the type, but
    whatever the type the integer value must be one of the two permitted,
    and types other than int don't really make sense).  This patch makes
    the ABI-compatible change to (-0x7fffffff).

    (The testcase handles positive and negative sign separately to avoid
    any issues with implicit conversions that could result in e.g. INT_MIN
    converted to uintmax_t wrongly passing.)

    Tested (compilation only) with build-many-glibcs.py.

        [BZ #20859]
        * sysdeps/sh/sh4/bits/mathdef.h (FP_ILOGB0): Define to
        (-0x7fffffff) instead of 0x80000001.
        * math/test-fp-ilogb-constants.c: New file.
        * math/Makefile (tests): Add test-fp-ilogb-constants.

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

Summary of changes:
 ChangeLog                                          |    8 +++
 math/Makefile                                      |    3 +-
 .../test-fp-ilogb-constants.c                      |   51 ++++++++-----------
 sysdeps/sh/sh4/bits/mathdef.h                      |    2 +-
 4 files changed, 33 insertions(+), 31 deletions(-)
 copy stdlib/tst-quick_exit.cc => math/test-fp-ilogb-constants.c (61%)

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