Before this change, the dirty feature code only checked for differences between FEATURE_foo and QT_FEATURE_foo, without taking into account modified INPUT_foo values that might passed via the configure script. This led to issues in certain scenarios when reconfiguring with the configure script. For example configuring with -gui / -DINPUT_gui=ON and then with -no-gui / -DINPUT_gui=OFF would fail saying 'Feature "widgets": Forcing to "ON" breaks its condition' This happens because the widgets feature depends on gui being available, but because INPUT_gui modifications don't trigger the dirty feature re-eval code, we don't recompute the value of widgets. Extract the code that takes into account the INPUT_foo variables into a separate function, and use it both when computing feature values and also when detecting dirty features. This means any non-matching INPUT_foo variables will now also trigger dirty feature checking. Use the same function to replace the duplicate code we have to early initialize the developer-build, no-prefix and pkg-config features. Pick-to: 6.6 Task-number: QTBUG-112957 Change-Id: I775cf70b48291a659b0fecf7cb9570ec12735bca Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>