[Bug build/29966] Cannot build anymore for win32 thread model of gdb

["jwakely.gcc at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29966

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

           What    |Removed                     |Added
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                 CC|                            |jwakely.gcc at gmail dot com

--- Comment #12 from Jonathan Wakely <jwakely.gcc at gmail dot com> ---
For libstdc++ I have no interest whatsoever in supporting Windows 98 and other
dinosaurs. The win32 thread model that was previously completely non-functional
now supports C++11 std::mutex etc. but only for "Windows Vista and Server 2008
or later" (to quote the comment in gthr-win32.h). If you define _WIN32_WINNT to
an older value, you can't use std::mutex etc. That's not "something also wrong
with gcc and libstdc++ too", it's just reality.

So if GDB wants to use threads for a mingw target that uses
--enable-threads=win32 (rather than --enable-thread=posix via libwinpthreads)
then it needs to target Vista or Server 2008 or later. Otherwise, if it wants
to target older versions of Windows, then it needs to not use std::mutex etc.

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