[PATCH] libstdc++: Check right value of __cpp_lib_format for dynamic_string

[Tomasz Kaminski]

On Wed, Apr 1, 2026 at 10:40 PM Jonathan Wakely <jwakely@redhat.com> wrote:

> This doesn't matter in practice, but strictly speaking the right value
> for defining std::dynamic_string is 202603 not 202311 (which was the
> macro value for the old name, std::runtime_format).
>
> libstdc++-v3/ChangeLog:
>
>         * include/std/format (dynamic_string): Check new value for
>         feature test macro.
> ---
>
> Tested x86_64-linux.
>
Makes sense.

>
>  libstdc++-v3/include/std/format | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libstdc++-v3/include/std/format
> b/libstdc++-v3/include/std/format
> index 2bcd06822b75..eca5bd213aa0 100644
> --- a/libstdc++-v3/include/std/format
> +++ b/libstdc++-v3/include/std/format
> @@ -195,7 +195,7 @@ namespace __format
>        = basic_format_string<wchar_t, type_identity_t<_Args>...>;
>  #endif
>
> -#if __cpp_lib_format >= 202311L // >= C++26
> +#if __cpp_lib_format >= 202603L // >= C++26
>    [[__gnu__::__always_inline__]]
>    inline __format::_Dynamic_format_string<char>
>    dynamic_format(string_view __fmt) noexcept
> --
> 2.53.0
>
>
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