[PATCH v4 6/6] libstdc++: Set FMT for complete C++23 mdspan [PR107761].

[Tomasz Kaminski]

On Tue, Jul 8, 2025 at 10:26 AM Luc Grosheintz <luc.grosheintz@gmail.com>
wrote:

>         PR libstdc++/107761
>
> libstdc++-v3/ChangeLog:
>
>         * include/bits/version.def (mdspan): Set to 202207 and remove
>         no_stdname.
>         * include/bits/version.h: Regenerate.
>         * testsuite/23_containers/mdspan/ftm.cc: Test presence
>         of FTM.
>
> Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>
> ---
>
LGTM.

>  libstdc++-v3/include/bits/version.def              | 3 +--
>  libstdc++-v3/include/bits/version.h                | 3 ++-
>  libstdc++-v3/testsuite/23_containers/mdspan/ftm.cc | 9 +++++++++
>  3 files changed, 12 insertions(+), 3 deletions(-)
>  create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/ftm.cc
>
> diff --git a/libstdc++-v3/include/bits/version.def
> b/libstdc++-v3/include/bits/version.def
> index 64f8190d240..f1015abdbfa 100644
> --- a/libstdc++-v3/include/bits/version.def
> +++ b/libstdc++-v3/include/bits/version.def
> @@ -1007,9 +1007,8 @@ ftms = {
>
>  ftms = {
>    name = mdspan;
> -  no_stdname = true; // FIXME: remove
>    values = {
> -    v = 1; // FIXME: 202207
> +    v = 202207;
>      cxxmin = 23;
>    };
>  };
> diff --git a/libstdc++-v3/include/bits/version.h
> b/libstdc++-v3/include/bits/version.h
> index 744246a9938..80f6586372d 100644
> --- a/libstdc++-v3/include/bits/version.h
> +++ b/libstdc++-v3/include/bits/version.h
> @@ -1126,8 +1126,9 @@
>
>  #if !defined(__cpp_lib_mdspan)
>  # if (__cplusplus >= 202100L)
> -#  define __glibcxx_mdspan 1L
> +#  define __glibcxx_mdspan 202207L
>  #  if defined(__glibcxx_want_all) || defined(__glibcxx_want_mdspan)
> +#   define __cpp_lib_mdspan 202207L
>  #  endif
>  # endif
>  #endif /* !defined(__cpp_lib_mdspan) && defined(__glibcxx_want_mdspan) */
> diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/ftm.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/ftm.cc
> new file mode 100644
> index 00000000000..106ee4010ee
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/ftm.cc
> @@ -0,0 +1,9 @@
> +// { dg-do compile { target c++23 } }
> +#include <mdspan>
> +
> +#ifndef __cpp_lib_mdspan
> +#error "Feature test macro __cpp_lib_mdspan is missing for <mdspan>"
> +#if __cpp_lib_mdspan < 202207
> +#error "Feature test macro __cpp_lib_mdspan has the wrong value"
> +#endif
> +#endif
> --
> 2.49.0
>
>
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