[PATCH v5 7/7] libstdc++: Set __cpp_lib_submdspan to 202411.

[Tomasz Kaminski]

On Mon, Dec 8, 2025 at 9:21 PM Luc Grosheintz <luc.grosheintz@gmail.com>
wrote:

> The submdspan feature is complete and this commit sets the feature
> testing macros accordingly. Also makes the feature testing macro
> submdspan depend on constant_wrapper.
>
> Also changes the value of the internal feature testing macro for padded
> layouts to 202403.
>
> libstdc++-v3/ChangeLog:
>
>         * include/bits/version.def (submdspan): Set to 202411 add
>         dependency.
>         * include/bits/version.h: Regenerate.
>
> Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>
> ---
>
LGTM.

>  libstdc++-v3/include/bits/version.def | 6 +++---
>  libstdc++-v3/include/bits/version.h   | 7 ++++---
>  2 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/libstdc++-v3/include/bits/version.def
> b/libstdc++-v3/include/bits/version.def
> index d20e08519ca..048568f2f43 100644
> --- a/libstdc++-v3/include/bits/version.def
> +++ b/libstdc++-v3/include/bits/version.def
> @@ -1090,17 +1090,17 @@ ftms = {
>    name = padded_layouts;
>    no_stdname = true; // internal
>    values = {
> -    v = 1;
> +    v = 202403;
>      cxxmin = 26;
>    };
>  };
>
>  ftms = {
>    name = submdspan;
> -  no_stdname = true; // TODO: change once complete
>    values = {
> -    v = 1;
> +    v = 202411;
>      cxxmin = 26;
> +    extra_cond = "__glibcxx_constant_wrapper >= 202506L";
>    };
>  };
>
> diff --git a/libstdc++-v3/include/bits/version.h
> b/libstdc++-v3/include/bits/version.h
> index c75368d44c2..cfbccefa284 100644
> --- a/libstdc++-v3/include/bits/version.h
> +++ b/libstdc++-v3/include/bits/version.h
> @@ -1214,7 +1214,7 @@
>
>  #if !defined(__cpp_lib_padded_layouts)
>  # if (__cplusplus >  202302L)
> -#  define __glibcxx_padded_layouts 1L
> +#  define __glibcxx_padded_layouts 202403L
>  #  if defined(__glibcxx_want_all) ||
> defined(__glibcxx_want_padded_layouts)
>  #  endif
>  # endif
> @@ -1222,9 +1222,10 @@
>  #undef __glibcxx_want_padded_layouts
>
>  #if !defined(__cpp_lib_submdspan)
> -# if (__cplusplus >  202302L)
> -#  define __glibcxx_submdspan 1L
> +# if (__cplusplus >  202302L) && (__glibcxx_constant_wrapper >= 202506L)
> +#  define __glibcxx_submdspan 202411L
>  #  if defined(__glibcxx_want_all) || defined(__glibcxx_want_submdspan)
> +#   define __cpp_lib_submdspan 202411L
>  #  endif
>  # endif
>  #endif /* !defined(__cpp_lib_submdspan) */
> --
> 2.52.0
>
>
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