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Subject: [Bug libstdc++/98725] Review what is disabled in libstdc++ by
 --disable-wchar_t
Date: Sat, 09 Oct 2021 00:15:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98725

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:0afb9ebaab09b999f1d158ffc3fb906fdab9df67

commit r12-4263-g0afb9ebaab09b999f1d158ffc3fb906fdab9df67
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Oct 8 14:24:18 2021 +0100

    libstdc++: Always define typedefs and hash functions for wide strings [=
PR
98725]

    The wstring and wstring_view typedefs should be enabled even if
    <wchar.h> isn't supported, because char_traits<wchar_t> works
    unconditionally. Similarly, the std::hash specializations for wide
    strings do not depend on <wchar.h> support.

    Although the primary template works OK for std::char_traits<wchar_t> in
    the absence of <wchar.h> support, this patch still defines it as an
    explicit specialization for compatibility with declarations that expect
    it to be specialized. The explicit specialization just uses the same
    __gnu_cxx::char_traits base class as the primary template.

    libstdc++-v3/ChangeLog:

            PR libstdc++/98725
            * include/bits/char_traits.h (char_traits<wchar_t>): Define
            explicit specialization unconditionally.
            * include/bits/basic_string.h (hash<wstring>): Define
            unconditionally. Do not check _GLIBCXX_USE_WCHAR_T.
            * include/bits/stringfwd.h (wstring): Likewise.
            * include/debug/string (wstring): Likewise.
            * include/experimental/string_view (experimental::wstring_view)
            (hash<experimental::wstring_view>): Likewise.
            * include/std/string (pmr::wstring, hash<pmr::wstring>):
            Likewise.
            * include/std/string_view (wstring_view, hash<wstring_view>):
            Likewise.=