[Development] Raising the minimum to C++20

[Thiago Macieira]

On Wednesday, 3 May 2023 05:59:26 PDT Vladimir Minenko via Development wrote:
> “…1. Use C++20 code with Qt - https://bugreports.qt.io/browse/QTBUG-109360
> 2. C++20 is required for the development of Qt itself -
> https://bugreports.qt.io/browse/QTBUG-109361

Which stage are we in? I think we're before 1.

I'd propose we move to #1 immediately, for 6.6: we build with C++20 if the 
compiler supports C++20.

See also https://codereview.qt-project.org/c/qt/qtbase/+/463425

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Cloud Software Architect - Intel DCAI Cloud Engineering
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