Re-apply patch #1700288 (first applied in r59931, rolled back in r59940)
now that ctypes uses a more supported method to create types:
Method cache optimization, by Armin Rigo, ported to 2.6 by Kevin Jacobs.
diff --git a/Include/object.h b/Include/object.h
index b434a21..7294158 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -345,6 +345,9 @@
PyObject *tp_weaklist;
destructor tp_del;
+ /* Type attribute cache version tag. Added in version 2.6 */
+ unsigned int tp_version_tag;
+
#ifdef COUNT_ALLOCS
/* these must be last and never explicitly initialized */
Py_ssize_t tp_allocs;
@@ -529,6 +532,10 @@
/* Objects support nb_index in PyNumberMethods */
#define Py_TPFLAGS_HAVE_INDEX (1L<<17)
+/* Objects support type attribute cache */
+#define Py_TPFLAGS_HAVE_VERSION_TAG (1L<<18)
+#define Py_TPFLAGS_VALID_VERSION_TAG (1L<<19)
+
/* These flags are used to determine if a type is a subclass. */
#define Py_TPFLAGS_INT_SUBCLASS (1L<<23)
#define Py_TPFLAGS_LONG_SUBCLASS (1L<<24)
@@ -550,6 +557,7 @@
Py_TPFLAGS_HAVE_CLASS | \
Py_TPFLAGS_HAVE_STACKLESS_EXTENSION | \
Py_TPFLAGS_HAVE_INDEX | \
+ Py_TPFLAGS_HAVE_VERSION_TAG | \
0)
#define PyType_HasFeature(t,f) (((t)->tp_flags & (f)) != 0)