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Date: Sun, 3 Jul 2016 20:16:41 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Re: [PATCH v2] Add stdc-predef.h.
On Wed, Jun 08, 2016 at 11:57:02PM +0900, Masanori Ogino wrote:
> 2016-06-04 14:04 GMT+09:00 Rich Felker <dalias@...c.org>:
> > On Sat, Jun 04, 2016 at 01:19:47PM +0900, Masanori Ogino wrote:
> >> > #define __STDC_ISO_10646__ 201103L
> >> > #define __STDC_UTF_16__ 1
> >> > #define __STDC_UTF_32__ 1
> >> > #define __STDC_IEC_559__ 1
> >> > #define __STDC_NO_ATOMICS__ 1
> >> >
> >> > #endif
> >> >
> >> > Obviously my Unicode date is older -- I haven't checked which is more
> >> > correct, but after the next release we should update to latest Unicode
> >> > anyway.
> >>
> >> Sure.
> >>
> >> By the way, is there any automation script to update them using the
> >> Unicode database? I couldn't find that.
> >
> > There's an unpolished set of tools that do the job, which I posted the
> > the mailing list several years back. I should publish them in a more
> > permanent and accessible place though.
> >
> > Also the tools are not entirely sufficient to perform an upgrade.
> > Adding new case mappings requires some manual work, checking for case
> > mappings in Unicode that musl doesn't produce and adding the right
> > table tricks to get them.
>
> OK.
>
> >> > #if !defined(__GCC_IEC_559) || __GCC_IEC_559 > 0
> >> > #define __STDC_IEC_559__ 1
> >> > #endif
> >> >
> >> > What do you think? Anyone else have thoughts on the matter?
> >> >
> >>
> >> Well, is there any compiler that does not define __GCC_IEC_559 but
> >> uses stdc-predef.h?
> >
> > Even old (pre-4.8) gcc doesn't use stdc-predef.h, but you can add
> > "-include stdc-predef.h" to its specs file. Presumably you can do
> > similar tricks with other compilers (via a wrapper script if nothing
> > else).
>
> I see. I don't have any strong opinion against !defined(__GCC_IEC_559)
> clause and I'm happy with it. I guess that such users are wise enough
> to define the proper __GCC_IEC_559 value after reviewing the header,
> though.
>
> I'm sorry for the delay.
OK, commited patch based on this. Thanks!
Rich
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