[Cfp-interest 1261] Re: Fw: WANT macros

[Jim Thomas]

> On Jan 29, 2019, at 6:39 AM, Rajan Bhakta <rbhakta at us.ibm.com> wrote:
> 
> Hello,
> 
> Some feedback re our position to remove the WANT macros.
> I intend to push back on the header version macros saying it needs a proposal.
> Anything else the group wants me to bring forward?

I think we should give our opinion on renaming math functions, if it comes up.
> 
> I do intend on writing our status report after our next meeting which I hope we can review via this list before I submit it.
> The current text is:
>   - Working closely with 754 (strong liaison, one member is chair and one is the editor)
>   - Working on creating updated TS's for the ones voted in (parts 2 and 3) for inclusion into the working C2X draft

Only parts 1 and 2 are voted in so far. Right? Part 1 is integrated (by Jens) into a C2X working draft. The integration draft for part 2 will be submitted to Jens. Part 3 as annex will be submitted to WG14. A new proposal for part 4a will be submitted WG14. This should all be done before the next WG14 mailing, assuming CFP approves.

- Jim Thomas

>   - Will continue binding IEEE-754 2019 to the TS's that remain after C2X
> 
> Regards,
> 
> Rajan Bhakta
> z/OS XL C/C++ Compiler Technical Architect
> ISO C Standards Representative for Canada, PL22.11 Chair (USA)
> C Compiler Development
> Contact: rbhakta at us.ibm.com, Rajan Bhakta/Houston/IBM
> ----- Forwarded by Rajan Bhakta/Houston/IBM on 01/29/2019 08:32 AM -----
> 
> From:        Jens Gustedt <jens.gustedt at inria.fr>
> To:        "Rajan Bhakta" <rbhakta at us.ibm.com>
> Cc:        David Keaton <dmk at dmk.com>, Larry Jones <lawrence.jones at siemens.com>
> Date:        01/29/2019 02:28 AM
> Subject:        Re: WANT macros
> 
> 
> 
> Hello,
> 
> On Mon, 28 Jan 2019 17:49:32 -0600, Rajan Bhakta wrote:
> 
> > Also, just so it's not a surprise, the CFP group will be stating our 
> > preference of removing the WANT macros as we believe they are needed
> > for TS's but not for actual standards. I intend to write up our
> > position in the CFP group status report in time for the London
> > mailing.
> 
> That is good to hear, so we mainly agree, here.
> 
> The only thing that I'd like to note to that position is that it would
> make more sense to make the distinction between mandatory and optional
> parts of the standard.
> 
> So my personal position would be
> 
> - no WANT macros in the numbered clauses
> 
> - WANT macros in Annex F and perhaps Annex G (don't remember if we
>   were adding interfaces, here)
> 
> This is to avoid exposure of symbols of optional parts of the standard
> to code that doesn't expect them. This would keep us in line with the
> current policy in Annex K.
> 
> What I also would like to add is version macros for the headers. This
> is because implementations and users will otherwise have a difficult
> time getting things straight during a transition to C2x. Nowadays,
> compiler and library often come from different parties and a global
> version macro for the standard version is not appropriate to match
> that situation. POSIX does this and has good experience with that, I
> think.
> 
> So I would like to have __STDC_MATH_VERSION__ and similar, for all
> library clauses where we add interfaces.
> 
> > From:   David Keaton <dmk at dmk.com>
> > ....
> 
> >       One thing you could do is to merge the TSes the way you hope it 
> > works, and let the committee see how that looks.  However, that might
> > be a lot of work, so you don't have to do that.
> 
> The first is now merged as had been proposed (modulo bugs,
> probably). Removing these parts is not a big deal, editorially, but I
> wouldn't want to change that before London, unless you are telling me
> that removing WANT is what everybody voted for implicitly.
> 
> What we could do is to add a warning in the preamble to early adopters
> that this WANT thing is something that is likely to change in the
> process.
> 
> 
> 
> 
> Thanks
> Jens
> 
> 
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> 
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