Report: __STDC_ISO_10646__ constant is out-of-date

[John Scott <jscott@posteo.net>]

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Hello,

I prefer to send my bug report here instead of registering on Bugzilla and 
hope that's alright. I'm also not subscribed; please keep me CC'd.

I'm using glibc 2.30 on Debian GNU/Linux. 2.30 and 2.32 appear to have added 
support for Unicode 12.1.0 and 13.0 respectively [1] [2], but stdc-
predef.h [3] even in git seems to lag behind reflecting these changes:
> /* wchar_t uses Unicode 10.0.0.  Version 10.0 of the Unicode Standard is
>    synchronized with ISO/IEC 10646:2017, fifth edition, plus
>    the following additions from Amendment 1 to the fifth edition:
>    - 56 emoji characters
>    - 285 hentaigana
>    - 3 additional Zanabazar Square characters */
> #define __STDC_ISO_10646__              201706L
so in this way clients won't be able to know that it's supported. Except for 
some possible discrepancy in Unicode Inc. and ISO/IEC's release dates, 
suitable constants for 2.32 and 2.30 ought to be 202003L and 201905L 
respectively [4].

Regards,
John

[1] https://sourceware.org/legacy-ml/libc-alpha/2019-08/msg00029.html
[2] https://sourceware.org/pipermail/libc-announce/2020/000029.html
[3] https://sourceware.org/git/?p=glibc.git;f=include/stdc-predef.h;hb=HEAD
[4] https://www.unicode.org/history/publicationdates.html

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