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[Bug]: Runtime error when built with Qt6: Must construct a QApplication before a QWidget #3829

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a17r opened this issue Dec 30, 2024 · 7 comments
Open
1 task done

[Bug]: Runtime error when built with Qt6: Must construct a QApplication before a QWidget #3829

a17r opened this issue Dec 30, 2024 · 7 comments

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@a17r
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a17r commented Dec 30, 2024

What did you do?

Built git master against Qt 6.8.1 successfully after applying #3828

What did you expect to see?

Successful application start

What did you see instead?

$ sqlitebrowser 
QWidget: Must construct a QApplication before a QWidget
Aborted

DB4S Version

3.13.99 (nightly)

What OS are you seeing the problem on?

Linux

OS version

Gentoo Linux

Relevant log output

$ sqlitebrowser 
QWidget: Must construct a QApplication before a QWidget
Aborted

Prevention against duplicate issues

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@justinclift
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@a17r Just to make sure I'm understanding ok (am super sleepy), now that #3828 has been merged this can be closed yeah? 😄

@a17r
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a17r commented Dec 31, 2024

No, build succeeds, runtime does not.

@justinclift
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No worries at all, glad I asked. 😄

@mgrojo
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mgrojo commented Jan 1, 2025

@a17r, does it run ok on the commit introducing Qt6 support, i.e. 0635074 ?

@a17r
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a17r commented Jan 2, 2025

Unfortunately I can't build from that commit (non-existing in git master).

https://stackoverflow.com/questions/21590421/must-construct-a-qapplication-before-a-qwidget
https://www.qtcentre.org/threads/61483-How-to-fix-error-Must-construct-a-QApplication-before-a-QWidget

@mgrojo
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mgrojo commented Jan 2, 2025

Unfortunately I can't build from that commit (non-existing in git master).

Try with d824554 instead.

https://stackoverflow.com/questions/21590421/must-construct-a-qapplication-before-a-qwidget https://www.qtcentre.org/threads/61483-How-to-fix-error-Must-construct-a-QApplication-before-a-QWidget

I haven't found any widget that is created before the QApplication. But the MainWindow is created inside the Application constructor, but it has always been like that.

@a17r
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a17r commented Jan 3, 2025

@mgrojo same runtime error when built at d824554

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@justinclift @a17r @mgrojo