[Bug 254714] include <math.h> contains a c11 extension

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254714

--- Comment #8 from commit-hook at FreeBSD.org ---
A commit in branch stable/10 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=74b123c0a5ecfe2081c47de98820cdfabb64024d

commit 74b123c0a5ecfe2081c47de98820cdfabb64024d
Author:     Dimitry Andric <dim at FreeBSD.org>
AuthorDate: 2021-04-08 11:13:15 +0000
Commit:     Dimitry Andric <dim at FreeBSD.org>
CommitDate: 2021-04-15 10:26:48 +0000

    Avoid -pedantic warnings about using _Generic in __fp_type_select

    When compiling parts of math.h with clang using a C standard before C11,
    and using -pedantic, it will result in warnings similar to:

    bug254714.c:5:11: warning: '_Generic' is a C11 extension [-Wc11-extensions]
      return !isfinite(1.0);
              ^
    /usr/include/math.h:111:21: note: expanded from macro 'isfinite'
                        ^
    /usr/include/math.h:82:39: note: expanded from macro '__fp_type_select'
                                          ^

    This is because the block that enables use of _Generic is conditional
    not only on C11, but also on whether the compiler advertises support for
    C generic selections via __has_extension(c_generic_selections).

    To work around the warning without having to pessimize the code, use the
    __extension__ keyword, which is supported by both clang and gcc. While
    here, remove the check for __clang__, as _Generic has been supported for
    a long time by gcc too now.

    Reported by:    yuri
    PR:             254714

 lib/msun/src/math.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

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