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

[Thiago Macieira]

On Monday 14 October 2024 09:53:56 GMT-7 Thiago Macieira wrote:
> > The last time we discussed this was at QtCS24
> > (https://wiki.qt.io/QtCS2024_C%2B%2B20), where IIRC the conclusion was
> > that
> > ATM, there is no reason to switch to C++20. So, it is definitely not in
> > 6.9.
> 
> That was "not require C++20 for users". I'm not asking for that. I am asking
> that we switch how we build Qt. Users won't be affected.

And no platforms will be dropped, no new compilers will be required. That was 
Phase I½ in the QtCS link above.

What's the drawback with this?

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