[PATCH] libstdc++: Add c++2a <syncstream>

[Thomas Rodgers]

> On Oct 21, 2020, at 10:34 AM, Jonathan Wakely <jwakely@redhat.com> wrote:
> 
> On 21/10/20 09:53 -0700, Thomas Rodgers wrote:
>> From: Thomas Rodgers <trodgers@redhat.com>
>> 
>> libstdc++/Changelog:
>> 	libstdc++-v3/doc/doxygen/user.cfg.in (INPUT): Add new header.
>> 	libstdc++-v3/include/Makefile.am (std_headers): Add new header.
>> 	libstdc++-v3/include/Makefile.in: Regenerate.
>> 	libstdc++-v3/include/precompiled/stdc++.h: Include new header.
>> 	libstdc++-v3/include/std/streambuf
>>       (__detail::__streambuf_core_access): Define.
>>       (basic_streambuf): Befriend __detail::__streambuf_core_access.
> 
> This file is no longer part of the commit, so the server will reject
> this changelog. Please ensure the changelog is accurate (the
> gcc-verify alias created by contrib/gcc-git-customization.sh can do
> that) and push, thanks.
> 

This patch is dependent on the changes to <sstream> so I can’t push until that patch lands.