As proposed below I also updated gcc-13 branch.

     libstdc++: [_GLIBCXX_DEBUG] Define __cpp_lib_null_iterators

     _GLIBCXX_DEBUG has now fully N3344 compliant iterator checks, we 
can define
     __cpp_lib_null_iterators macros like the normal mode.

     libstdc++-v3/ChangeLog:

             * include/std/iterator (__cpp_lib_null_iterators): Define 
regardless of
             _GLIBCXX_DEBUG.
             * include/std/version (__cpp_lib_null_iterators): Likewise.

François


On 20/03/2024 10:02, Jonathan Wakely wrote:
> On Wed, 20 Mar 2024 at 05:59, François Dumont wrote:
>> Thanks to you doc:
>>
>>       libstdc++: [_GLIBCXX_DEBUG] Define __[glibcxx,cpp_lib]_null_iterators
>>
>>       _GLIBCXX_DEBUG has now fully N3344 compliant iterator checks, we
>> can define
>>       __glibcxx_null_iterators and __cpp_lib_null_iterators macros like
>> the normal
>>       mode.
>>
>>       libstdc++-v3/ChangeLog:
>>
>>               * version.def (null_iterators): Remove extra_cond.
>>               * version.h: Regenerate.
>>
>> Ok to commit ?
> Please don't bother talking about __glibcxx_null_iterators in the
> commit message, that's an implementation detail that always mirrors
> the standard-defined __cpp_lib_null_iterators one. The first line of
> the commit will be much easier to read without that.
>
> OK with that change, thanks.
>
>> I already noticed that GCC 13 has no version.h file so no backport question.
> It has no version.h but it still has the macros:
>
> include/std/iterator:# define __cpp_lib_null_iterators 201304L
> include/std/version:# define __cpp_lib_null_iterators 201304L
>
> Those definitions can be made to not depend on _GLIBCXX_DEBUG.
>