[Qt-interest] Q

[Arnold Krille]

On Monday 16 August 2010 18:10:35 R. Reucher wrote:
> Arnold Krille wrote:
> > On Monday 16 August 2010 15:31:23 Alex wrote:
> >> Hh, you are right, but I have a software and the software need the older
> >> version Hh
> > 
> > Even then you should use the latest of the Qt3 series (they are binary-
> > and source-compatible in upward direction). This will give you more
> > optimizations, more bug fixes and less security-holes.
> 
> Not _exactly_... they are (more or less) source-compatible on the major
> release numbers, and binary-compatible on minor releases (an app compiled
> for 3.0.x will not run with Qt 3.3.x libs).

As far as I understand Trolltech/Nokia, you are wrong. One of their main 
selling points is binary compatibility within a major series in the upward 
direction. Linking an app with qt3.0 and then updating the libs to qt3.5 will 
_not_ result in a broken app.
The opposite way on the other hand is not promised to work. Linking an app to 
qt3.5 and then trying to run it against qt3.1 will most probably not work, 
even if you didn't explicitly use new functions/classes.
And my practical experience tells me I am right;-)

The same applies to the Qt4 series btw.

Have fun,

Arnold
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