[PATCH] libstdc++: Include range_access.h from <optional>, <stacktrace> and <valarray>

[Jonathan Wakely]

Oh, the subject line says "and <valarray>" but that isn't covered by the patch.

On Fri, 15 May 2026 at 16:10, Tomasz Kamiński <tkaminsk@redhat.com> wrote:
>
> As the range accessor all already conditionally noexcept, this implements
> LWG4131 and LWG3625 (also part 4.8. section of the P3016R6). As for any
> LWG issue resolutions, changes are applied as DR for oldest applicable
> standards:
> * <optional> (LWG4131): C++26, since optional range support
> * <stacktrace> (LWG3625): C++23, since introduction
>
> libstdc++-v3/ChangeLog:
>
>         * include/std/optional [__cpp_lib_optional_range_support]:
>         Replace <bits/stl_iterator.h> include with <bits/range_access.h>.
>         * include/std/stacktrace: Likewise.
> ---
>  libstdc++-v3/include/std/optional   | 2 +-
>  libstdc++-v3/include/std/stacktrace | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/include/std/optional b/libstdc++-v3/include/std/optional
> index e3c6ea20988..8d6d049e8cc 100644
> --- a/libstdc++-v3/include/std/optional
> +++ b/libstdc++-v3/include/std/optional
> @@ -62,7 +62,7 @@
>  #ifdef __cpp_lib_optional_range_support // C++ >= 26
>  # include <bits/formatfwd.h>
>  # include <bits/ranges_base.h>
> -# include <bits/stl_iterator.h>
> +# include <bits/range_access.h>
>  #endif
>
>  namespace std _GLIBCXX_VISIBILITY(default)
> diff --git a/libstdc++-v3/include/std/stacktrace b/libstdc++-v3/include/std/stacktrace
> index 587a163e976..79941d93b88 100644
> --- a/libstdc++-v3/include/std/stacktrace
> +++ b/libstdc++-v3/include/std/stacktrace
> @@ -45,9 +45,9 @@
>  #include <bits/memory_resource.h>
>  #include <bits/stl_algobase.h>
>  #include <bits/stl_algo.h>
> -#include <bits/stl_iterator.h>
>  #include <bits/stl_uninitialized.h>
>  #include <bits/stl_tempbuf.h> // __get_temporary_buffer
> +#include <bits/range_access.h>
>  #include <ext/numeric_traits.h>
>
>  namespace std _GLIBCXX_VISIBILITY(default)
> --
> 2.54.0
>