Getting errors building Qt application for Pi3

[bossssie]

Hi,

I am developing a project for the Raspberry Pi 3B. I have made a GUI in Qt Designer and a bit of C++ code. This all went great until it didn’t. For some reason I cannot build the project anymore, and I can’t find out what changed.

I now get a “AutoMoc subprocess error, The moc process failed to compile.” Detailed log is in the attachment

What I tried:
-restoring from git to previous working solution
-New project
-Different PC with clean install of VisualGDB and Toolchain
-Clean raspberry pi image

[bossssie]

I now tried installing it with Raspi Os Buster and that seems to work again. But would like to get it working with bullseye

[support]

Hi,

Different versions of the Raspberry Pi OS come with different Qt versions. Hence, if your application was developed with an older Qt, it may need to be adjusted in order to work on the latest one.

You might be able to get some clues on the Qt forums, as other users upgrading to a newer Qt have likely experienced similar issues.

[Author]

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