Qt 6 to require C++20 in the future

Hello,

Qt 6 is going to require C++20 in the future. When that happens, can we 
switch to C++20 as well, or are we going to stick to C++17 for 4.x?

They plan to do this in three phases, disclosed in QTBUG-109360 [1] 
QTBUG-109361 [2] QTBUG-109362 [3].

The first phase is already done: Qt 6.7 uses the "spaceship" operator, 
for example. The second phase is going to require C++20 supporting 
compiler to build Qt, and the third phase is going to require C++20 
supporting compiler for building applications that use Qt.

Since we build Qt ourselves, the second phase is relevant to us.

Qt 6.8 continues to not require C++20, Qt 6.9 is unlikely to require 
C++20. However, the tentative plan is to require C++20 supporting 
compiler with Qt 6.9, 6.10, or 6.11.

Qt 6.9 is going to release in March 2025 [4], Qt 6.10 late 2025, and I 
expect Qt 6.11 to be released in Spring 2026. Considering 4.0 is still 
not released, I don't think 5.0 is going to be around in 2026 so 
sticking to C++17 might be a problem for VLC media player.

[1] https://bugreports.qt.io/browse/QTBUG-109360
[2] https://bugreports.qt.io/browse/QTBUG-109361
[3] https://bugreports.qt.io/browse/QTBUG-109362
[4] https://wiki.qt.io/Qt_6.9_Release

Sincerely,
Fatih Uzunoğlu

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