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

[Thiago Macieira]

On Monday 28 October 2024 09:14:43 Pacific Standard Time Thiago Macieira wrote:
> Of course.
> 
> But you understood my general goals and, so long as I keep to them as Volker
> is requesting, neither you nor anyone else had a problem.

Update:
Re: https://bugreports.qt.io/browse/QTBUG-131575

even before I made any changes (and I'm not sure I would have enough time), 
looks like Microsoft beat us to the punch: you CANNOT mix C++17 and C++20 in a 
static build of Qt with MSVC. You must choose a single option for ALL your 
code.

This changes the premise I made: that users didn't have a business choosing 
the C++ version.

That being the case, I'm just not going to do anything. Not my problem any 
more to move us forward. That also means I will not be doing the work to test 
our headers in C++23 mode either - that's SEP again.

My concerns regarding ABI remain and will continue to block anything that 
would offer C++20 content to users that expands to too-much inline code 
(std::format, for now).

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