build failure agaisnt Qt6: error: ‘class QEasingCurve’ has no member named ‘operator!=’ ...

[akhuettel]

I'm trying to move our Gentoo package from Qt5 to Qt6.

• klayout 0.29.11
• Qt 6.8.2
• gcc 13.3.1

The build fails in gsiDeclQEasingCurve.cc with the following error (and some more):

../../../src/gsiqt/qt6/QtCore/gsiDeclQEasingCurve.cc:162:58: error: ‘class QEasingCurve’ has no member named ‘operator!=’; did you mean ‘operator=’?
  162 |   ret.write<bool > ((bool)((QEasingCurve *)cls)->operator!= (arg1));
      |                                                          ^~

In addition to !=, also == seems to be missing.

Happy to test patches and/or build from master.

[akhuettel]

klayout-0.29.11-r1:20250215-143253.log.gz
Here's the full build log.

[klayoutmatthias]

Looks like the Qt people have removed these operators in Qt 6.8. That's a pity, as usually their API stays backward compatible.

The code is not written, but generated (from Qt 6.4 as of now). So there is no patch. Instead the solution will be more complex.

As of now, I'd suggest to stay with Qt5.

Matthias

[klayoutmatthias]

I have published a PR that should fix the problem. There were a number of other places where the API has been changed for Qt 6.8.

I tested with ArchLinux that has Qt 6.8.2.

Matthias

[Kazzz-S]

In my environment:

• OS: macOS Sonoma
• KLayout: 0.29.11
• Qt6: Qt 6.8.2 from Homebrew
• Compiler: Apple clang version 15.0.0 (clang-1500.3.9.4)

I was able to reproduce the "operator!=" named issue.
I had overlooked this issue until today because previous binary builds with Qt 6.7.2 worked after the Qt6 upgrade.
I also verified that the build issue was fixed in the issue-1987 branch.

Thanks to both of you for reporting and fixing the issue.

Kazzz-S

[akhuettel]

I can confirm that 0.29.11 with the three patches builds and runs fine.