[Bug math/21930] C-only gcc builtins used in <math.h> isinf

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https://sourceware.org/bugzilla/show_bug.cgi?id=21930

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=42496114ec0eb7d6d039d05d4262e109951c600c

commit 42496114ec0eb7d6d039d05d4262e109951c600c
Author: Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Date:   Tue Aug 22 16:34:42 2017 -0300

    Provide a C++ version of iszero that does not use __MATH_TG (bug 21930)

    When signaling nans are enabled (with -fsignaling-nans), the C++ version
    of iszero uses the fpclassify macro, which is defined with __MATH_TG.
    However, when support for float128 is available, __MATH_TG uses the
    builtin __builtin_types_compatible_p, which is only available in C mode.

    This patch refactors the C++ version of iszero so that it uses function
    overloading to select between the floating-point types, instead of
    relying on fpclassify and __MATH_TG.

    Tested for powerpc64le, s390x, x86_64, and with build-many-glibcs.py.

        [BZ #21930]
        * math/math.h [defined __cplusplus && defined __SUPPORT_SNAN__]
        (iszero): New C++ implementation that does not use
        fpclassify/__MATH_TG/__builtin_types_compatible_p, when
        signaling nans are enabled, since __builtin_types_compatible_p
        is a C-only feature.
        * math/test-math-iszero.cc: When __HAVE_DISTINCT_FLOAT128 is
        defined, include ieee754_float128.h for access to the union and
        member ieee854_float128.ieee.
        [__HAVE_DISTINCT_FLOAT128] (do_test): Call check_float128.
        [__HAVE_DISTINCT_FLOAT128] (check_float128): New function.
        * sysdeps/powerpc/powerpc64le/Makefile [subdir == math]
        (CXXFLAGS-test-math-iszero.cc): Add -mfloat128 to the build
        options of test-math-zero on powerpc64le.

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

Summary of changes:
 ChangeLog                            |   17 +++++++
 math/math.h                          |   33 ++++++++++++--
 math/test-math-iszero.cc             |   79 ++++++++++++++++++++++++++++++++++
 sysdeps/powerpc/powerpc64le/Makefile |    3 +-
 4 files changed, 127 insertions(+), 5 deletions(-)

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