I'm a bit late to this game, but ...
> I don’t see why you’d want to remove the switch for Qt 6. 
> It would be a porting help for application developers.

Application developers will not build their own Qt, but rely on the QList with 
the switch their Qt and Qt-using 3rd party libraries are built with.

And how does it work if different 3rdparty qt libraries requires the switch 
differently?

/Sune
 - Qt, KDE and Debian guy at night. Qt & c++ freelancer by day.

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I can tell you from m Qt3 -> Qt4 transition, with a similar switch (to enable 
Qt3 functions that were killed off)

We did the following.. Our release, was built with the Qt3to4 library and 
switches enabled.

However, our developer builds had the switch turned off, so we didn’t introduce 
new code using the old API.

Scott
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