diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index bbff1d2926b..d077057aaa8 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -95,6 +95,40 @@
 #  error Qt major version not 6 or 7
 #endif
 
+/* Macro and tag type to help overload resolution on functions
+   that are, e.g., QT_REMOVED_SINCE'ed. Example use:
+
+   #if QT_CORE_REMOVED_SINCE(6, 4)
+   int size() const;
+   #endif
+   qsizetype size(QT6_DECL_NEW_OVERLOAD) const;
+
+   in the normal cpp file:
+
+   qsizetype size(QT6_IMPL_NEW_OVERLOAD) const {
+      ~~~
+   }
+
+   in removed_api.cpp:
+
+   int size() const { return int(size(QT6_CALL_NEW_OVERLOAD)); }
+*/
+#ifdef Q_CLANG_QDOC
+# define QT6_DECL_NEW_OVERLOAD
+# define QT6_DECL_NEW_OVERLOAD_TAIL
+# define QT6_IMPL_NEW_OVERLOAD
+# define QT6_IMPL_NEW_OVERLOAD_TAIL
+# define QT6_CALL_NEW_OVERLOAD
+# define QT6_CALL_NEW_OVERLOAD_TAIL
+#else
+# define QT6_DECL_NEW_OVERLOAD QT6_ONLY(Qt::Disambiguated_t = Qt::Disambiguated)
+# define QT6_DECL_NEW_OVERLOAD_TAIL QT6_ONLY(, QT6_DECL_NEW_OVERLOAD)
+# define QT6_IMPL_NEW_OVERLOAD QT6_ONLY(Qt::Disambiguated_t)
+# define QT6_IMPL_NEW_OVERLOAD_TAIL QT6_ONLY(, QT6_IMPL_NEW_OVERLOAD)
+# define QT6_CALL_NEW_OVERLOAD QT6_ONLY(Qt::Disambiguated)
+# define QT6_CALL_NEW_OVERLOAD_TAIL QT6_ONLY(, QT_CALL_NEW_OVERLOAD)
+#endif
+
 /* These two macros makes it possible to turn the builtin line expander into a
  * string literal. */
 #define QT_STRINGIFY2(x) #x
diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index dd70e91a8f3..5c8ed2e8e5b 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -1580,6 +1580,11 @@ namespace Qt {
     };
     inline constexpr Initialization Uninitialized = Initialization::Uninitialized;
 
+    struct Disambiguated_t {
+        explicit Disambiguated_t() = default;
+    };
+    inline constexpr Disambiguated_t Disambiguated{};
+
     enum CoordinateSystem {
         DeviceCoordinates,
         LogicalCoordinates
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 000001c1bfe..23e3e9736be 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -3009,6 +3009,11 @@
     \internal
 */
 
+/*!
+    \enum Qt::Disambiguated_t
+    \internal
+*/
+
 /*!
     \enum Qt::CoordinateSystem
     \since 4.6
diff --git a/src/corelib/tools/qhashfunctions.h b/src/corelib/tools/qhashfunctions.h
index 58f4afc94f3..e9da0718031 100644
--- a/src/corelib/tools/qhashfunctions.h
+++ b/src/corelib/tools/qhashfunctions.h
@@ -150,7 +150,8 @@ Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(const QByteArray &key, size_t se
 Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(const QByteArrayView &key, size_t seed = 0) noexcept;
 #else
 Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(QByteArrayView key, size_t seed = 0) noexcept;
-inline Q_DECL_PURE_FUNCTION size_t qHash(const QByteArray &key, size_t seed = 0 QT6_ONLY(, int = 0)) noexcept
+inline Q_DECL_PURE_FUNCTION size_t qHash(const QByteArray &key, size_t seed = 0
+        QT6_DECL_NEW_OVERLOAD_TAIL) noexcept
 { return qHash(qToByteArrayViewIgnoringNull(key), seed); }
 #endif