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sr #110286: Make it possible to request a specific (non-latest) version of a language standard

Submitter:  Zack Weinberg <zackw>
Submitted:  Mon 27 Jul 2020 06:31:37 PM UTC
Votes: 1
 
Priority:  * 3 - Release N+1 Severity:  4 - Important
Status:  Confirmed Privacy:  Public
Assigned to:  None Open/Closed:  Open
Operating System:  None
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Fri 08 Dec 2023 05:14:34 PM UTC, comment #2: 

Because we have reports that automatic selection of the latest language standard actually breaks various builds (e.g. bug #110879), let's treat this as an actual bug rather than just a feature request, and as a priority for 2.73.  It is too late to do anything about it for 2.72, however.

Copying over links posted in bug #110879:

Zack Weinberg <zackw>
Group administrator
Sun 15 Nov 2020 08:24:17 PM UTC, comment #1: 

I don't think it's going to be possible to make this happen before 2.70.

Zack Weinberg <zackw>
Group administrator
Mon 27 Jul 2020 06:31:37 PM UTC, original submission:  

Feedback on the 2.69b beta indicates that users find the new behavior of AC_PROG_CC and AC_PROG_CXX, automatically selecting the latest supported language standard, problematic.  Quoting https://lists.gnu.org/archive/html/autoconf/2020-07/msg00010.html :

> One issue we [PostgreSQL] would like to point out is that
> the new scheme of automatically checking for the latest
> version of the C and C++ standards (deprecating AC_PROG_CC_C99
> etc.) is problematic...
>
> [W]e have set C99 as the project standard. So checking for
> C11 is (a) useless, and (b) bad because we don't want
> developers to accidentally make use of C11 features and have
> the compiler accept them silently.
>
> It looks like it's not easy to disable these tests even
> with low-level hackery. It would be better if there were
> still a way to set the preferred level of C and C++ in
> an official way.


and https://lists.gnu.org/archive/html/autoconf/2020-07/msg00012.html :

> Particularly as applies to C++, it is useful to be able
> to set an upper bar (and lower bar) for the C++ version
> requested because C++11 is in many ways not similar to
> older C++. I am already aware that some of my own software
> will not compile with C++11 because of removed deprecated
> features which I have not attended to yet in the code.
> Furthermore, the ABI often changes between C++ versions
> and it is useful to be able to specify the C++ version
> for purposes of the ABI.




Zack Weinberg <zackw>
Group administrator

 

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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2024-05-10 egallager Carbon-Copy- Added egallager
    2023-12-08 zackw Severity1 - Wish 4 - Important
        StatusNone Confirmed
    2023-12-08 zackw Priority1 - Blocked 3 - Release N+1
    2020-12-09 zackw Carbon-Copy- Added karl
    2020-11-15 zackw Priority5 - Unprioritized 1 - Blocked

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