[Bug libstdc++/57585] New: New --enable-clocale model using POSIX 2008

[Bug libstdc++/57585] New: New --enable-clocale model using POSIX 2008

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57585

            Bug ID: 57585
           Summary: New --enable-clocale model using POSIX 2008
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org

Now that uselocale() is in POSIX we should consider a new
--enable-clocale=ieee_1003.1-2008 based on the gnu model, which could be used
on any POSIX-2008 OS and would reduce differences between targets.

[Bug libstdc++/57585] New --enable-clocale model using POSIX 2008

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57585

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-01-13

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See the thread at
https://gcc.gnu.org/pipermail/libstdc++/2021-January/051843.html

[Bug libstdc++/57585] New --enable-clocale model using POSIX 2008

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57585

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Separately, it would be good to provide a libintl-based implementation of
std::messages, for targets where that's not part of glibc.

[Bug libstdc++/57585] New --enable-clocale model using POSIX 2008

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57585

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #2)
> Separately, it would be good to provide a libintl-based implementation of
> std::messages, for targets where that's not part of glibc.

Although the POSIX catopen/catclose/catgets one might be good enough, once we
support https://cplusplus.github.io/LWG/lwg-defects.html#2028 so that
messages_base::catalog is large enough to store a nl_catd.

[Bug libstdc++/57585] New --enable-clocale model using POSIX 2008

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57585

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 57961
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57961&action=edit
Add --enable-clocale=ieee_1003.1-2008

This is an initial prototype of a new clocale model.

The wide string info needs to be transcoded from the narrow string info,
because unlike Glibc, POSIX doesn't provide wide character versions of
nl_langinfo items like _NL_WMON_1