Legacy Qt 5 build - what about building with even older Qt?

[Darthagnon]

Role

I play Minecraft with PollyMC or UltimMC on various legacy systems.

Suggestion

Why not for the legacy Qt5 build, build with Qt 5.3.6 with WinXP flags for full legacy support?

Benefit

So that Minecraft will work on nearly all possible computer systems out there

This suggestion is unique

• [X] I have searched the issue tracker and did not find an issue describing my suggestion, especially not one that has been rejected.

You may use the editor below to elaborate further.

As I understand, Qt 5.3.6 was the last version of Qt to support WinXP (with compiler flags). UltimMC and MultiMC are still built with this version of Qt (though I haven't yet tested on my XP system whether they still work). Prism and Polly are both more progressive forks of MultiMC and appear to be in the process of migrating to Qt6 (and hence Win10+ exclusivity). I am very grateful that you still have the Qt5 builds, as they work on my older Win10 system where the Qt6 builds fail, as well as on my Win7 systems.

I recently was given an old XP laptop, and I was thinking, there's probably a fair few XP laptops still floating around in 3rd world countries out there. It would be nice if there was a polished launcher like PollyMC that worked on them. Since Qt5 is now legacy, why not build on the same Qt version as the master MultiMC, 5.3.6, with a flag allowing it to work on WinXP as well as Win7?

Caveat: I'm not sure how far the codebase has progressed beyond Qt 5.3.6, or if there are any key advantages or features from Qt 5.12 that are being used in the legacy builds.

[Darthagnon]

Update: MultiMC/UltimMC are Qt5.6.3, not the WinXP-compatible QT5.3.6.