QProperty: Mark metaType as unused in else branch of createFor()

The metaType is only used in the constexpr if branch where the callable
is not std::is_invocable_v. Therefore, we need to mark it as unused in
order to avoid compile errors in code that exercises the other branch.

Change-Id: I46e855b0f4b0a088f15ff41d4929fe010531b97e
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/corelib/kernel/qpropertyprivate.h b/src/corelib/kernel/qpropertyprivate.h
index df12c1fdb3..6bac03243b 100644
--- a/src/corelib/kernel/qpropertyprivate.h
+++ b/src/corelib/kernel/qpropertyprivate.h
@@ -177,6 +177,7 @@ struct BindingFunctionVTable
                     auto untypedEvaluationFunction = static_cast<Callable *>(f);
                     return std::invoke(*untypedEvaluationFunction, metaType, dataPtr);
                 } else {
+                    Q_UNUSED(metaType);
                     QPropertyData<PropertyType> *propertyPtr = static_cast<QPropertyData<PropertyType> *>(dataPtr);
                     // That is allowed by POSIX even if Callable is a function pointer
                     auto evaluationFunction = static_cast<Callable *>(f);