[Bug 1968868] [NEW] Kdevelop stopped parsing C++ files / code semantic hilighting not working

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Ubuntu 20.04 Focal Fossa
Kdevelop 5.5.0

Starting kdevelop from console:
$ KDEV_CLANG_DISPLAY_DIAGS=1 kdevelop

For all parsed C++ files, keeps showing:
kdevelop.plugins.clang: Failed to parse translation unit: ....
kdevelop.plugins.clang: clang_parseTranslationUnit2 return with error code 1 


The hilighting was working fine before, and no apparent related Clang/llvm upgrades in /var/log/apt/history.log that might cause issues.


C++ parsing works when downloading Kdevelop AppImage and starting that for the same project:
https://download.kde.org/stable/kdevelop/5.6.1/bin/linux/KDevelop-5.6.1-x86_64.AppImage

** Affects: kdevelop (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: c++ hilighting kdevelop parsing
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Kdevelop stopped parsing C++ files / code semantic hilighting not working
https://bugs.launchpad.net/bugs/1968868
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