From what I read from here:

https://stackoverflow.com/questions/12590255/what-does-stdc-iso-10646-exactly-mean

and here:

https://standards.iso.org/ittf/PubliclyAvailableStandards/index.html

it seems like the latest ISO/IEC 10646 standard that most closely match
Unicode 12.1.0 is ISO/IEC 10646:2017/Amd 2:2019 (fifth edition 2017,
amendment 2).

From what I read in the document here:
https://standards.iso.org/ittf/PubliclyAvailableStandards/c073773_ISO_IEC_10646_2017_Amd_2_2019%20(E).zip

on first page, this amendment was made on 2019-06. So I would guess that
the correct value should be:

```
#define __STDC_ISO_10646__ 201906L
```

All this with a grain of salt as this is the first time I am looking at
ISO/IEC 10646.

Thanks for looking into this!

Regards,
Lefteris



On Mon, Oct 14, 2019 at 2:07 PM Rich Felker <dalias@libc.org> wrote:

> On Sat, Oct 12, 2019 at 11:56:44PM +0100, Eleftherios Kritikos wrote:
> > Yes. I also created a merge request for musl-chartable-tools
> > https://github.com/richfelker/musl-chartable-tools/pull/2
>
> Thanks. stdc-predef.h also needs to be updated with a new value for
> __STD_ISO_10646__. Do you know the right yyyymm value it should have
> for this version of Unicode?
>
> Rich
>
>
> > On Sat, 12 Oct 2019, 11:40 pm Rich Felker, <dalias@libc.org> wrote:
> >
> > > On Sat, Oct 12, 2019 at 10:27:42PM +0100, u_quark wrote:
> > > > ---
> > > >  src/ctype/alpha.h      | 159
> +++++++++++++++++++++-------------------
> > > >  src/ctype/nonspacing.h |  88 ++++++++++++-----------
> > > >  src/ctype/punct.h      | 160
> ++++++++++++++++++++++-------------------
> > > >  src/ctype/wide.h       |  26 +++----
> > > >  4 files changed, 232 insertions(+), 201 deletions(-)
> > >
> > > Is this done just by dropping the new Unicode files into
> > > musl-chartable-tools and running make?
> > >
> > > Rich
> > >
>