[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=6913ad65e00bb32417ad39c41d292b976171e27e

commit 6913ad65e00bb32417ad39c41d292b976171e27e
Author: Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Date:   Mon Aug 14 17:51:51 2017 -0300

    Do not use generic selection in C++ mode

    The logic to protect the use of generic selection (_Generic) does not
    check for C or C++ mode, however, generic selection is a C-only
    feature.

    Tested for powerpc64le.

        * misc/sys/cdefs.h (__HAVE_GENERIC_SELECTION): Define to 0, if
        in C++ mode.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=47a67213a9f51c5f8816d240500b10db605d8b77

commit 47a67213a9f51c5f8816d240500b10db605d8b77
Author: Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Date:   Fri Aug 11 14:29:06 2017 -0300

    Do not use __builtin_types_compatible_p in C++ mode (bug 21930)

    The logic to define isinf for float128 depends on the availability of
    __builtin_types_compatible_p, which is only available in C mode,
    however, the conditionals do not check for C or C++ mode.  This lead to
    an error in libstdc++ configure, as reported by bug 21930.

    This patch adds a conditional for C mode in the definition of isinf for
    float128.  No definition is provided in C++ mode, since libstdc++
    headers undefine isinf.

    Tested for powerpc64le (glibc test suite and libstdc++-v3 configure).

        [BZ #21930]
        * math/math.h (isinf): Check if in C or C++ mode before using
        __builtin_types_compatible_p, since this is a C mode feature.

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

Summary of changes:
 ChangeLog        |   11 +++++++++++
 math/math.h      |    8 ++++++--
 misc/sys/cdefs.h |   19 ++++++++++---------
 3 files changed, 27 insertions(+), 11 deletions(-)

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