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From: "jwakely.gcc at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug build/29966] Cannot build anymore for win32 thread model of gdb
Date: Sat, 07 Jan 2023 21:58:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29966

Jonathan Wakely <jwakely.gcc at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jwakely.gcc at gmail dot c=
om

--- Comment #12 from Jonathan Wakely <jwakely.gcc at gmail dot com> ---
For libstdc++ I have no interest whatsoever in supporting Windows 98 and ot=
her
dinosaurs. The win32 thread model that was previously completely non-functi=
onal
now supports C++11 std::mutex etc. but only for "Windows Vista and Server 2=
008
or later" (to quote the comment in gthr-win32.h). If you define _WIN32_WINN=
T to
an older value, you can't use std::mutex etc. That's not "something also wr=
ong
with gcc and libstdc++ too", it's just reality.

So if GDB wants to use threads for a mingw target that uses
--enable-threads=3Dwin32 (rather than --enable-thread=3Dposix via libwinpth=
reads)
then it needs to target Vista or Server 2008 or later. Otherwise, if it wan=
ts
to target older versions of Windows, then it needs to not use std::mutex et=
c.

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