[PATCH] libstdc++: Use specific feature test macro for #if in <string>

[Tomasz Kaminski]

On Mon, Mar 9, 2026 at 5:47 PM Jonathan Wakely <jwakely@redhat.com> wrote:

> libstdc++-v3/ChangeLog:
>
>         * include/bits/basic_string.h: Check __glibcxx_to_string instead
>         of __cplusplus.
> ---
>
> Tested x86_64-linux.
>
LGTM

>
>  libstdc++-v3/include/bits/basic_string.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/include/bits/basic_string.h
> b/libstdc++-v3/include/bits/basic_string.h
> index 9bbe16507d00..202a911f9ef3 100644
> --- a/libstdc++-v3/include/bits/basic_string.h
> +++ b/libstdc++-v3/include/bits/basic_string.h
> @@ -56,11 +56,10 @@
>  # include <bits/ranges_util.h>          // ranges::subrange
>  #endif
>
> -#if __cplusplus > 202302L
> +#if __glibcxx_to_string >= 202306L // C++ >= 26
>  # include <charconv>
>  #endif
>
> -
>  #if ! _GLIBCXX_USE_CXX11_ABI
>  # include "cow_string.h"
>  #else
> --
> 2.53.0
>
>
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