Fix crash when running a limited API build of 3.9 in 3.12

The size of propertyobject as needed as basic size of PyClassProperty_spec needs to be adapted according to runtime version.

Otherwise, PyType_FromSpecWithBases  fails with:
TypeError: tp_basicsize for type 'PySide6.QtCore.PyClassProperty' (56) is too small for base 'property' (64)

Task-number: PYSIDE-2230
Change-Id: I03788edbb7031577f37db0fb2eb029b41f37c5f1
Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io>
(cherry picked from commit 16357c822eff14ff3bfe1b6f4dcf445c407d8b2f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit ab3125f6147e9b6a741850ee470ffcec76bfe5b1)

2 files changed, 11 insertions, 2 deletions

diff --git a/sources/pyside6/libpyside/class_property.cpp b/sources/pyside6/libpyside/class_property.cpp
index 02e061277..39f536061 100644
--- a/sources/pyside6/libpyside/class_property.cpp
+++ b/sources/pyside6/libpyside/class_property.cpp
@@ -68,6 +68,8 @@ PyTypeObject *PyClassProperty_TypeF()
     if (type == nullptr) {
         // Provide the same `tp_getset`, which is not inherited.
         PyClassProperty_slots[0].pfunc = PyProperty_Type.tp_getset;
+        if (_PepRuntimeVersion() >= 0x030A00)
+            PyClassProperty_spec.basicsize = sizeof(propertyobject310);
         type = SbkType_FromSpec(&PyClassProperty_spec);
     }
     return type;
diff --git a/sources/pyside6/libpyside/class_property.h b/sources/pyside6/libpyside/class_property.h
index a3125b169..4942e0ef3 100644
--- a/sources/pyside6/libpyside/class_property.h
+++ b/sources/pyside6/libpyside/class_property.h
@@ -15,11 +15,18 @@ struct propertyobject {
     PyObject *prop_set;
     PyObject *prop_del;
     PyObject *prop_doc;
-#if PY_VERSION_HEX >= 0x030A0000
+    int getter_doc;
+};
+
+struct propertyobject310 {
+    PyObject_HEAD
+    PyObject *prop_get;
+    PyObject *prop_set;
+    PyObject *prop_del;
+    PyObject *prop_doc;
     // Note: This is a problem with Limited API: We have no direct access.
     //       You need to pick it from runtime info.
     PyObject *prop_name;
-#endif
    int getter_doc;
 };