[PATCH] libstdc++: Export std::enable_nonlocking_formatter_optimization in std.cc [PR121790]

[Jonathan Wakely]

On Thu, 19 Mar 2026 at 15:44, Jakub Jelinek <jakub@redhat.com> wrote:
>
> Hi!
>
> On Thu, Mar 19, 2026 at 03:03:38PM +0000, Jonathan Wakely wrote:
> > > enable_nonlocking_formatter_optimization has been added in PR121790 P3235R3
> > > r16-4351 and I have to wonder, though bits/formatfwd.h hunk already in
> > > PR121790 P3107R5 r16-4350.  I wonder why it shows up for C++23 though.
> >
> > P3235R3 was approved as a DR for C++23, at the 2024-06 meeting:
> > "8. Accept as a Defect Report and apply the changes in P3235R3
> > (std::print more types faster with less memory) to the C++ working
> > paper. "
> > The committee kept approving a LOT of std::format and std::print changes as DRs.
> > So it's enabled in the header for C++23, and so it should also be
> > exported from the module for C++23.
>
> Ok, in that case here is another patch to export it.
>
> Tested on x86_64-linux, ok for trunk?

OK, thanks!

>
> 2026-03-19  Jakub Jelinek  <jakub@redhat.com>
>
>         PR libstdc++/121790
>         * src/c++23/std.cc.in: Add enable_nonlocking_formatter_optimization.
>
> --- libstdc++-v3/src/c++23/std.cc.in.jj 2026-03-19 16:11:11.203849141 +0100
> +++ libstdc++-v3/src/c++23/std.cc.in    2026-03-19 16:16:34.801386836 +0100
> @@ -1384,6 +1384,9 @@ export namespace std
>    using std::range_format;
>    using std::range_formatter;
>  #endif
> +#if __glibcxx_print >= 202403L
> +  using std::enable_nonlocking_formatter_optimization;
> +#endif
>  }
>
>  // <forward_list>
>
>
>         Jakub
>