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From: "luca.bacci at outlook dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/98723] On Windows with CP936 encoding, regex compiles
 very slow.
Date: Sat, 09 Dec 2023 13:52:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98723

Luca Bacci <luca.bacci at outlook dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luca.bacci at outlook dot =
com

--- Comment #8 from Luca Bacci <luca.bacci at outlook dot com> ---
(In reply to Jonathan Wakely from comment #1)
> The Windows behaviour fails to conform to the C and C++ standards. I think
> _M_transform should check errno and throw an exception on error (which me=
ans
> removing the non-throwing exceptions specification from that function).

Hi Jonathan! I'm giving it a go, but I have one question: which encoding are
the strings passed to _M_transform() / _M_compare() in?
(libstdc++-v3/config/locale/generic/collate_members.cc) is it the execution
character set? Or is it always UTF-8?

I am asking because we have to convert to UTF-16 and call wcsxfrm().

Many thanks,
Luca=