it seems I have no access to add comments to this bug report: https://qt-project.atlassian.net/browse/QTVSADDINBUG-1346

• MSVC 2022
• Qt Vs Addin 3.5
• Qt 6.8.2

In my test project whenever I change a single .cpp file, the full project rebuilds. This didn't happen with Qt Vs Addin 3.4.x

The reason for me was usage of forward slashes in property files (.props). I have to use backward slashes, otherwise some sort of folder comparison fails:

bad: <SOLUTION_DEPLOY_DIR>$(SOLUTION_BUILD_DIR)_deploy/</SOLUTION_DEPLOY_DIR>
good: <SOLUTION_DEPLOY_DIR>$(SOLUTION_BUILD_DIR)_deploy\</SOLUTION_DEPLOY_DIR>

With the forward slashes, the detailled build info shows that some sort of hash is added to qmake which forces a rebuild of that exact file (happens for every file):

2>    *** Previous command line: '/c /I"F:\mylib\BUILD64\TEST\DEBUG\QT\QMAKE\87CA77C47A214EBAB7EE1919FEF4C6A1" ...
2>    *** Current  command line: '/c /I"F:\mylib\BUILD64\TEST\DEBUG\QT\QMAKE\05501C2D095D4908AE5DACE0410DF89E" ...
2>    Source "someClass.cpp" doesn't match previous command line.

EDIT: The .cpp file is not included from anywhere. No dependencies at compile time.