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Subject: [Bug libstdc++/106953] C++23 add new headers for freestanding
Date: Fri, 16 Sep 2022 22:33:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106953

--- Comment #2 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:cf0fded5d837bad590eb091d8a3dc4898872560f

commit r13-2705-gcf0fded5d837bad590eb091d8a3dc4898872560f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Sep 15 21:02:32 2022 +0100

    libstdc++: Add preprocessor conditions for freestanding [PR106953]

    This adds checks for _GLIBCXX_HOSTED to a number of headers which are
    not currently installed for freestanding, but need to be for P1642R11
    support. For example, <iterator> needs to be installed for C++23
    freestanding mode, but without stream iterators and streambuf iterators.
    Similarly, <memory> needs to be installed, but without std::allocator
    and std::shared_ptr. This change disables the non-freestanding parts of
    those headers.

    libstdc++-v3/ChangeLog:

            PR libstdc++/106953
            * include/backward/auto_ptr.h [!_GLIBCXX_HOSTED]: Do not define
            shared_ptr members.
            * include/bits/alloc_traits.h [!_GLIBCXX_HOSTED]: Do not declare
            std::allocator_traits<std::allocator<T>> specializations for
            freestanding.
            * include/bits/memoryfwd.h [!_GLIBCXX_HOSTED] (allocator): Do
            not declare for freestanding.
            * include/bits/stl_algo.h [!_GLIBCXX_HOSTED] (stable_partition):
            Do not define for freestanding.
            [!_GLIBCXX_HOSTED] (merge, stable_sort): Do not use temporary
            buffers for freestanding.
            * include/bits/stl_algobase.h [!_GLIBCXX_HOSTED]: Do not declare
            streambuf iterators and overloaded algorithms using them.
            * include/bits/stl_uninitialized.h [!_GLIBCXX_HOSTED]: Do not
            define specialized overloads for std::allocator.
            * include/bits/unique_ptr.h [!_GLIBCXX_HOSTED] (make_unique)
            (make_unique_for_overwrite, operator<<): Do not define for
            freestanding.
            * include/c_global/cstdlib [!_GLIBCXX_HOSTED] (_Exit): Declare.
            Use _GLIBCXX_NOTHROW instead of throw().
            * include/debug/assertions.h [!_GLIBCXX_HOSTED]: Ignore
            _GLIBCXX_DEBUG for freestanding.
            * include/debug/debug.h [!_GLIBCXX_DEBUG]: Likewise.
            * include/std/bit [!_GLIBCXX_HOSTED]: Do not use the custom
            __int_traits if <ext/numeric_traits.h> is available.
            * include/std/functional [!_GLIBCXX_HOSTED]: Do not include
            headers that aren't valid for freestanding.
            (boyer_moore_searcher, boyer_moore_horspool_searcher): Do not
            define for freestanding.
            * include/std/iterator [!_GLIBCXX_HOSTED]: Do not include
            headers that aren't valid for freestanding.
            * include/std/memory [!_GLIBCXX_HOSTED]: Likewise.
            * include/std/ranges [!_GLIBCXX_HOSTED] (istream_view): Do not
            define for freestanding.
            (views::__detail::__is_basic_string_view) [!_GLIBCXX_HOSTED]:
            Do not define partial specialization for freestanding.=