Joseph Kowalski wrote:

> As I recall, I thought we were supporting this multiple versions of 
> "Apache, MySQL, PHP" at the level they assert to be compatible.
>> Considering the fact that Trolltech is orders of magnitude better at 
>> maintaining compatibility than either of those above.
> That's good to hear, but that doesn't address the question.  The 
> question is "Does Trolltech respect upwards compatibility below the 
> Major release level (ie: QT3 -> QT4)?".  If the answer is "yes", then 
> Whoopie!  If the answer is "no", we need to look further into this.

Official answer to this question from Trolltech:

<QUOTE>
I checked with Qt support experts here in Redwood City and they
confirmed that Qt4.x is forward binary compatible with previous
versions, i.e. a program written for Qt4.2 will run with no problem on
subsequent Qt4.2+n releases. (f.ex. Qt4.3 and Qt4.4). However, a Qt4.4
program will not necessarily automatically runs on Qt4.3 or Qt4.2,
especially if the new program takes advantage of newer functionality of
a later release.

The compatibility is at major release level, i.e. 4.x and so all
sub-releases like 4.x.y are compatible as well, obviously.
</QUOTE>

--Stefan

-- 
Stefan Teleman
Sun Microsystems, Inc.
Stefan.Teleman at Sun.COM


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