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QT (win32) Cannot use custom widgets build by itself


other - Aug 25 2009
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Question:Good day,
I would like to know if anybody has a work around for the following problem.

I need to build my application for Windows and Linux, and therefore I'm using the prebuild QT binaries as development environment, notably qt-sdk-win-opensource-2009.03.1.exe (Qt 4.5.2)

I'm using the qLed Widget that is available on this site. It builds fine under Linux and Windows.
The problem appears when I try to use the qledplugin.dll under the windows version of QT Creator.

Navigating in Qt Creator to Tools->Form Editor->About QT designed plugins, I can see that it located my plugin at:
c:\Qt\2009.03\bin\designer\qledplugin.dll, but it failed to load it, due to a library incompatibility:

"The plugin uses incompatible Qt library. Expected build key "Windows msvc relase full-config", to "Windows mingw release full-config".

Is this really the intention that the windows version of QT should use MSVC to build custom widgets? It ships standard with mingw as compiler...

Any feedback will be much appreciated.

Note: There is a similar question posted directly to Trolltech, with no resolution proposed to the question: http://labs.trolltech.com/forums/topic/697




frixfrix
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Answer:The answer is revealed at
http://labs.trolltech.com/forums/topic/1068

---- SNIP ----
I (jcable) reported this some months ago but Nokia don't seem to care.

The version of QT Creator shipped with the QT SDK Open Source version for windows is build using Visual Studio, whereas the SDK is build with and supports g++ (MinGW). This doesn't cause too many problems, but it totally defeats building and installing QT Designer plugins into QT Creator. The error message is:

Expected build key "Windows msvc release full-config" got "Windows mingw release full-config"

It can be solved three different ways:

1) Build QT Creator from source with MinGW
2) Build the plugin with Visual Studio
3) Build QT Creator with build key checking turned off.

Please, Nokia - ship a QT Creator which is built with the same compiler as the SDK!

---- SNIP ----

Note: Option (2) would be useless if you've got MS Visual Studio and the QT SDK precompiled build.(win-opensource-2009.03.1)
The reason: The QT SDK part is build with MinGW. Visual Studio will compile the source of your widget and when it gets to linking time, you will have QT libraries that was build in MinGW and not with Visual Studio, so you'll be stuck again.
Just recompile the QT Creator source with MinGW and be done with it.






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frixfrix
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