This configure switch sets the CMake variable
CMAKE_INTERPROCEDURAL_OPTIMIZATION_<CONFIG> per release config to ON.
The feature 'ltcg' is enabled if any of the variables
CMAKE_INTERPROCEDURAL_OPTIMIZATION,
CMAKE_INTERPROCEDURAL_OPTIMIZATION_<CONFIG> are ON.
In order to implement the check, configurejson2cmake had to be extended
to be able to write extra CMake code before and after the feature
definition. This extra code can be added to a feature mapping below the
keys "cmakePrelude" and "cmakeEpilogue".
Task-number: QTBUG-85373
Change-Id: Ia2eb907edcf087f137977a9b090705397f83eb05
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
96bdcdacbc