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

[Giuseppe D'Angelo]

Hello,

Il 28/10/24 16:39, Fabian Kosmale via Development ha scritto:
> However, if it comes to ABI, I'm not convinced that we have a solution.
> As long as e.g. libstdc++ declares its support experimental, are we
> really willing to export C++20 symbols from Qt? If not, do we have
> strategy to prevent this from happening?

This isn't just about exporting C++20 symbols from Qt, is it? The very 
fact that Qt _consumes_ C++20 symbols makes Qt exposed to an ABI break 
by libstdc++.

In other words, even we use C++20 as a mere "implementation detail" for 
us, we'd still be exposed to this issue.

(It's still a bit unclear to me which C++20 datatypes we'd actually 
expose through an API/ABI boundary).

My 2 c,
-- 
Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - Trusted Software Excellence

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