Downgrade to Qt 4.6.3 -> compiled apps no longer work

[tamhanna]

Hi Folks,
I have a somewhat strange problem: as I am working on a network app (and thus cannot use Qt 4.7.1), I have uninstalled both Qt 4.7.1 and the S60v5 SDK. I then reinstalled first the SDK and then the "new Qt 4.6.3", and have also deployed 4.6.3 onto my Nokia XM5800.

When I now compile an app using the 4.6.3 and install it onto the XM5800, I cannot start the app up. I click the icon, it flashes and dies.

If I, however, install Qt 4.7.1, the app works again. So the 4.6.3 SDK builds an app which depends on 4.7.1 somehow.

Does anyone know what is going on here? Strangely, the included examples all work flawlessly...

[danhicksbyron]

I found that changing Qt versions, especially backwards, didn't always come off cleanly. Includes from the old version were not cleaned up. Complete reinstall was required.

[tamhanna]

Hi Dan,
thank you so much!

I have uninstalled 4.6.3, and then also the S60v5 SDK. I had other SDKs on the machine, which I didnt move. Must I really uninstall all of the SDKs?

Also, is there another way to find out which Qt version is currently integrated into the SDK?

[jakoskin]

You can check QT_VERSION.
Quick hack for sanity checking...
Create version_check.pro
add line

message($$QT_VERSION)

and run qmake.

[danhicksbyron]

I found that includes in epoc32/include had a "{N.N.N}" suffix when multiple versions were installed. The "active" version of the include would be installed without the suffix.

[tamhanna]

Hi Folks,
sorry for my large delay.

I have now run the modified .pro file, and got this message:
C:\Qt\4.6.3\bin\qmake.exe -recursive -spec symbian-abld QtNewsRadar.pro
Project MESSAGE: 4.6.3

However, during debugging I get the dependant libraries may be missing message once again on my Qt 4.6.3 device. This is getting really strange...

[jakoskin]

Installation time "dependencies missing, install anyway?":
Then it must be something in the PKG templates. I'd start with tracking backwards from application sis. With using dumpsis or similar check the dependencies and their version numbers. then go to app dir and look at the templated PKG files for clues.

Running (KErrNotFound/KErrNotSupported):
If nothing found from PKG files. Then go for outputted MMP files. Search for libraries that shouldn't be included.
e.g. Bearer/network libraries could be destructive.

If you are compiling / hacking Qt libraries:
Using qtlibinfix you will always get this dependency check failure at install.
Using patch_capabilities.pl on Qt DLLs will do the same.


If it is a Qt message and is about plugins.....

[danhicksbyron]

I'm guessing that one or more of your compiled-against libraries was 4.7.

[tamhanna]

Pivo (beer!) to all of you. Or Vodka.

Solution:
Uninstall Qt
Uninstall SDK
Delete its folder in /S60/
Reinstall SDK
Reinstall QT

Fixed.