QMetaType: Silence float comparison warnings in QEqualityOperatorForType

We actually do want to invoke the original equality operator there. If
that is unsafe, we cannot do much about it at this point.

Change-Id: Iadb2eaba1156828d89022d282c41bda57b500b13
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/corelib/global/qtypeinfo.h

@@ -250,11 +250,14 @@ struct is_container<T, std::void_t<
 
 
 // Checks the existence of the comparison operator for the class itself
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_FLOAT_COMPARE
 template <typename, typename = void>
 struct has_operator_equal : std::false_type {};
 template <typename T>
 struct has_operator_equal<T, std::void_t<decltype(bool(std::declval<const T&>() == std::declval<const T&>()))>>
         : std::true_type {};
+QT_WARNING_POP
 
 // Two forward declarations
 template<typename T, bool = is_container<T>::value>

src/corelib/kernel/qmetatype.h

@@ -2121,8 +2121,11 @@ struct BuiltinMetaType<T, std::enable_if_t<QMetaTypeId2<T>::IsBuiltIn>>
 template<typename T, bool = (QTypeTraits::has_operator_equal_v<T> && !std::is_pointer_v<T>)>
 struct QEqualityOperatorForType
 {
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_FLOAT_COMPARE
     static bool equals(const QMetaTypeInterface *, const void *a, const void *b)
     { return *reinterpret_cast<const T *>(a) == *reinterpret_cast<const T *>(b); }
+QT_WARNING_POP
 };
 
 template<typename T>