qt dll naming question

[Ralf Habacker]

Hi all, 

while thinking about the recent qmake problem thread started by Chris January 
and after a private communication with Jaruslav Staniek  about dll naming 
scheme for kdelibs I recognized an important issue about how to deal with 
different qt release installations and client apps using specific qt 
releases. 

Say someone have installed qt 3.3.3 and builds an app with this, this app 
requires qt-mt333.dll.  Now we release a new qt release say qt 3.3.4, which  
is api compatible - the qt dll is named qt-mt334.dll. Now the user updates to 
this new qt releases and his application will not run because of the changed 
dll name. This indicates that we should only use number parts of the release 
number into the dll name, which indicates a different api. 

The question is now, how does trolltech handle this stuff. Does anyone know if 
their release numbering system is technical, say by api changes or political 
driven ?  

cygwin for example uses a mixed system depending on the related package. 
Basically the use only on number, the major number, but there are also 
packages, which uses the minor number too and some packages uses additional 
the patch level number. 

Ralf