[Development] Switching Qt default builds to C++20 where supported

[Thiago Macieira]

On Tuesday 26 November 2024 16:32:20 Pacific Standard Time Tor Arne Vestbø via 
Development wrote:
> > Someone who cares about Windows/MSVC may want to take the mantle here,
> > because cpp-winrt will be disabled for C++17.
> 
> Please elaborate. Disabled by who, in what configuration, and why?

Disabled by https://codereview.qt-project.org/c/qt/qtbase/+/606908, which I've 
just submitted to fix that bug. Because cpp-winrt/C++17 is binary-incompatible 
with cpp-winrt/C++20, I am making a choice to only support the one with the 
official <coroutine> support.

Alternative analyses of the problem are welcome too.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel DCAI Platform & System Engineering
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