Qt Creator: Qt Creator shows errors in fresh project, but code compiles fine

stackoverflow.com/questions/60591719/qt-creator-shows-errors-in-fresh-project-but-code-compiles-fine/60593743#60593743

Qt Creator shows errors in fresh project, but code compiles fine

 

Q: Context: I recently switched from debian stable to debian testing so I have updated several hundred packages since the last time I used QT creator.

When I create a new project in QT creator I am greeted with many error messages.

For example, here are the errors for the autogenerated main.cpp class in a fresh project:

cstddef:50:10: fatal error: 'stddef.h' file not found error: variable has incomplete type 'QApplication' forward declaration of 'QApplication' unknown type name 'MainWindow'

When I open up previous projects that I know have no errors they also show a whole bunch of similar errors.

However, all of these projects build and run just fine.

What is causing this?

 

A: I found the solution to this problem in this bug report.

The libclang-common-8-dev package needs to be installed. After installing this package and restarting qt creator all of the errors went away.