can I compile kde 3.x.x against qt4

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can I compile kde 3.x.x against qt4
by anonymous on Thursday 08/Jul/2004, @10:31

I think I've something about, qt4 should be compatible to qt3.

Thanks for answers!

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Re: can I compile kde 3.x.x against qt4
by Daniel Molkentin on Thursday 08/Jul/2004, @10:37

Yes, but not without some changes to the build environment and possible also the sources. It's meant be easily portable for developers, not to be completely source compatible.

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Re: can I compile kde 3.x.x against qt4
by Fredrik Edemar on Thursday 08/Jul/2004, @10:38

No, qt4 is not binary compatible with qt3.

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Re: can I compile kde 3.x.x against qt4
by anon on Thursday 08/Jul/2004, @10:38

no.. quite a few changes are needed... which is why kde 4.0 will be a new release

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Re: can I compile kde 3.x.x against qt4
by MandrakeUser on Thursday 08/Jul/2004, @10:54

Well, it is written in the announcement !

"Compatibility with Qt 3: In order to minimize the work to migrate to Qt 4, Trolltech will provide comprehensive porting documents, tools and libraries. Most importantly, Qt 4 will provide an extension library that applications based on Qt 3 can link against to use obsolete classes. Using a separate library allows us to provide more compatibility than ever before, without bloating the Qt library with redundant functionality. This also means that developers can gradually begin to take advantage of Qt 4 features while continuing to use familiar Qt 3 functionality. "

I think this is optimal. Everyonce in a while backwards compatibility needs to be broken to implement fundamental changes. But the choice of a compat library is a great decision they made.

In the end, I think that both Qt and KDE should aim at keeping a very slow pace for jumping into "incompatible" versions, so that they can give a stable dev target to developers ... and I think they are doing a great job at it. I just hope the next jump in KDE (4.*) is designed with a life/cycle of a few years. At least two or three. KDE is already a mature platform :-)

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