Make cypclass always inherit virtually from all bases

Cython/Compiler/ModuleNode.py

@@ -1005,8 +1005,12 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
             code.put("struct %s" % type.cname)
             if type.base_classes:
                 base_class_list = [base_class.empty_declaration_code() for base_class in type.base_classes]
-                if type.is_cyp_class and (type.base_classes[-1] is cy_object_type or type.base_classes[-1].name == "ActhonActivableClass"):
-                    base_class_list[-1] = "virtual " + base_class_list[-1]
+                # if type.is_cyp_class and (type.base_classes[-1] is cy_object_type or type.base_classes[-1].name == "ActhonActivableClass"):
+                #     base_class_list[-1] = "virtual " + base_class_list[-1]
+                if type.is_cyp_class:
+                    base_class_decl = ",virtual public ".join(base_class_list)
+                    code.put(" : virtual public %s" % base_class_decl)
+                else:
                     base_class_decl = ", public ".join(base_class_list)
                     code.put(" : public %s" % base_class_decl)
             code.putln(" {")

tests/run/cypclass_multiple_inheritance.pyx

@@ -32,13 +32,36 @@ cdef cypclass Diamond(InplaceAddition, InplaceSubstraction):
         InplaceAddition.__init__(self, a)
         InplaceSubstraction.__init__(self, b)
 
-def test_non_virtual_inheritance():
+# def test_non_virtual_inheritance():
+#     """
+#     >>> test_non_virtual_inheritance()
+#     1
+#     2
+#     3
+#     0
+#     """
+#     cdef Diamond diamond = Diamond(1, 2)
+# 
+#     diamond.print_IA_base()
+#     diamond.print_IS_base()
+# 
+#     cdef InplaceAddition iadd_obj = InplaceAddition(2)
+#     cdef InplaceSubstraction isub_obj = InplaceSubstraction(2)
+# 
+#     diamond += iadd_obj
+#     diamond -= isub_obj
+# 
+#     diamond.print_IA_base()
+#     diamond.print_IS_base()
+
+
+def test_virtual_inheritance():
     """
-    >>> test_non_virtual_inheritance()
-    1
+    >>> test_virtual_inheritance()
+    2
+    2
+    2
     2
-    3
-    0
     """
     cdef Diamond diamond = Diamond(1, 2)