K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2022-07-29T17:08:49.438564Z
K 7
svn:log
V 1301
Remove unnecessary const and volatile qualifiers from __fp_type_select()

Since https://github.com/llvm/llvm-project/commit/ca75ac5f04f2, clang 15
has a new warning about _Generic selection expressions, such as used in
math.h:

    lib/libc/gdtoa/_ldtoa.c:82:10: error: due to lvalue conversion of the controlling expression, association of type 'volatile float' will never be selected because it is qualified [-Werror,-Wunreachable-code-generic-assoc]
            switch (fpclassify(u.e)) {
                    ^
    lib/msun/src/math.h:109:2: note: expanded from macro 'fpclassify'
            __fp_type_select(x, __fpclassifyf, __fpclassifyd, __fpclassifyl)
            ^
    lib/msun/src/math.h:85:14: note: expanded from macro '__fp_type_select'
        volatile float: f(x),                                               \
                 ^

This is because the controlling expression always undergoes lvalue
conversion first, dropping any cv-qualifiers. The 'const', 'volatile',
and 'volatile const' associations will therefore never be used.

MFC after:	1 week
Reviewed by:	theraven
Differential Revision: https://reviews.freebsd.org/D35815

(cherry picked from commit e50027e38d4f93887691f87b024e0abf37e98c78)

Git Hash:   0bbd0daf4ee5b4b7b8ec7650f2c65c499c0d103d
Git Author: dim@FreeBSD.org
END