Re: [PATCH 1/2] libstdc++: declare std::allocator in !HOSTED as an extension

[Jonathan Wakely <jwakely@redhat.com>]

On Thu, 9 Nov 2023 at 19:32, Arsen Arsenović <arsen@aarsen.me> wrote:
>
> This allows us to add features to freestanding which allow specifying
> non-default allocators (generators, collections, ...) without having to
> modify them.
>
> libstdc++-v3/ChangeLog:
>
>         * include/bits/memoryfwd.h: Remove HOSTED check around allocator
>         and its specializations.
> ---
> Evening,
>
> This patch adds std::allocator as a declaration to freestanding, so that
> it doesn't block various other bits of the library (such as collections
> or the generators that I intend to send in soon) from being added to
> freestanding anymore.
>
> I don't intend to pull in anything but <generator> into freestanding
> in this release, though, so, this patch will have little impact for now.
>
> Testing on x86_64-pc-linux-gnu (the tests are not done yet, but I see no
> relevant fails in previous test runs).  The follow-up patch also marks a
> new test as freestanding (as it was failing).
>
> OK for trunk?

OK


>
> Have a lovely evening!
>
>  libstdc++-v3/include/bits/memoryfwd.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/include/bits/memoryfwd.h b/libstdc++-v3/include/bits/memoryfwd.h
> index 330a6df7f44a..2b79cd8880a1 100644
> --- a/libstdc++-v3/include/bits/memoryfwd.h
> +++ b/libstdc++-v3/include/bits/memoryfwd.h
> @@ -60,13 +60,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>     * @{
>     */
>
> -#if _GLIBCXX_HOSTED
> +  // Included in freestanding as a libstdc++ extension.
>    template<typename>
>      class allocator;
>
>    template<>
>      class allocator<void>;
> -#endif
>
>  #if __cplusplus >= 201103L
>    /// Declare uses_allocator so it can be specialized in `<queue>` etc.
> --
> 2.42.1
>