Re: [musl] C23 implications for C libraries

["Jₑₙₛ Gustedt" <jens.gustedt@inria.fr>]

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Rich,

on Fri, 23 Sep 2022 10:58:44 -0400 you (Rich Felker <dalias@libc.org>)
wrote:

> On Fri, Sep 23, 2022 at 04:25:18PM +0200, Jₑₙₛ Gustedt wrote:
> > Hello,
> > I have started to compile a document that tries to collect
> > everything a C library needs for C23 compliance:
> > 
> >   https://htmlpreview.github.io/?https://icube-forge.unistra.fr/icps/c23-library/-/raw/main/README.html
> > 
> > This is by far not complete and I will try to fill the holes in the
> > next weeks. Let me know if you have any particular
> > questions/remarks/additions.  
>                                
> Thanks for putting this together. For the most part these look
> tractable.
> 
> One small note on wording: your usage of FTM differs from the one
> we're used to and that's in POSIX, where FTMs are macros the
> application defines to request some functionality or compliance
> profile from the implementation, not macros the implementation uses to
> advertise features to the application.

Sorry for that, the C standard calls these "Conditional feature macros"

> One cute observation: now that headers define macros for their
> versions, can we just replace the multiple-inclusion test macros with
> these? I think so.

Yes, indeed, I don't think that there is much that speaks against using
them also in that way.

Jₑₙₛ

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