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

[Jonathan Wakely]

On Wed, 6 May 2026 at 18:05, François Dumont <frs.dumont@gmail.com> wrote:
>
> On 3/9/26 17:46, Jonathan Wakely wrote:
> > libstdc++-v3/ChangeLog:
> >
> >       * include/bits/basic_string.h: Check __glibcxx_to_string instead
> >       of __cplusplus.
> > ---
> >
> > Tested x86_64-linux.
> >
> >   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
>
> Shouldn't it be:
>
> #if __glibcxx_to_string // C++ >= 23
>
> Even if it's not a big deal.


No, it's a C++26 feature, not C++23.