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>
4d86ca8c4e