Guidelins for one codebase that builds with Qt5 and Qt6?

[christoph at cullmann.io]

On 2024-08-05 16:24, Klaas Freitag wrote:
> Am 05.08.24 um 16:15 schrieb Halla Rempt:
> Hi,
> 
>> We're finally working on porting Krita to Qt6, but that's going to be 
>> a long road. I seem to remember that there were KDE apps that could be 
>> built with both Qt6/Kf6 and Qt5/Kf5. Did I remember that right? And if 
>> so, is there some howto or documentation for that?
> 
> This is a very good question. I have the two-platform solution done for 
> my little project PDFQuirk here: 
> https://github.com/dragotin/pdfquirk/tree/master/src
> 
> Since the project is small, that is just a bit of CMake fiddling. 
> However, I have no idea if it is solved "well".
> 
> For my bigger project Kraft I would rather port "at once", but having a 
> solution for both would be better...
> 
> Any input from wise people would be appreciated.

Hi,

from porting Kate (which is not that large, but with all plugins in the 
repo still non-trivial), just porting once on block was a lot
easier than trying to ifdef it around.

But depending how much of the API Krita uses got changed from Qt 5 to 6 
that might differ.

I found Qt 5 to 6 porting not that hard, at least compared to older 
porting efforts.

Greetings
Christoph

> 
> Thanks,
> Klaas