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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, 14 Jan 2023 17:52:50 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29966

--- Comment #46 from Jonathan Wakely <jwakely.gcc at gmail dot com> ---
(In reply to Jonathan Wakely from comment #45)
> So that might mean that GDB needs to pick a newer default value of
> _WIN32_WINNT, because the current "define it to 0x0501 if not defined
> already" logic selects a prehistoric version which cannot be used with GCC
> 13 + --enable-threads=3Dwin32

Another option (which I haven't actually tested) would be to extend the
existing configure check that uses std::thread to also include <mutex> and =
do:

std::mutex m;
std::lock_guard<std::mutex> l(m);

That would fail with GCC 13 + threads=3Dwin32 when _WIN32_WINNT < 0x0600, a=
nd so
GDB would disable threads.

It would work with GCC 13 with threads=3Dposix, or threads=3Dwin32 && _WIN3=
2_WINNT
>=3D 0x0600

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