fix signature of PySlice_GetIndicesEx() in recent Python versions (3.2+)

2 files changed, 11 insertions, 6 deletions

diff --git a/src/lxml/includes/etree_defs.h b/src/lxml/includes/etree_defs.h
index ff596ce8..b66dad4b 100644
--- a/src/lxml/includes/etree_defs.h
+++ b/src/lxml/includes/etree_defs.h
@@ -65,6 +65,13 @@
 #endif
 #endif
 
+/* PySlice_GetIndicesEx() has wrong signature in Py<=3.1 */
+#if PY_VERSION_HEX >= 0x03020000
+#  define _lx_PySlice_GetIndicesEx(o, l, b, e, s, sl) PySlice_GetIndicesEx(o, l, b, e, s, sl)
+#else
+#  define _lx_PySlice_GetIndicesEx(o, l, b, e, s, sl) PySlice_GetIndicesEx(((PySliceObject*)o), l, b, e, s, sl)
+#endif
+
 #ifdef WITHOUT_THREADING
 #  define PyEval_SaveThread() (NULL)
 #  define PyEval_RestoreThread(state)
diff --git a/src/lxml/python.pxd b/src/lxml/python.pxd
index 36995645..99e19ad9 100644
--- a/src/lxml/python.pxd
+++ b/src/lxml/python.pxd
@@ -74,13 +74,11 @@ cdef extern from "Python.h":
     cdef bint PyTuple_CheckExact(object instance)
     cdef bint PySlice_Check(object instance)
 
-    ctypedef class __builtin__.slice [object PySliceObject]:
-        pass
-
     cdef int _PyEval_SliceIndex(object value, Py_ssize_t* index) except 0
-    cdef int PySlice_GetIndicesEx(slice slice, Py_ssize_t length,
-                                  Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
-                                  Py_ssize_t *slicelength) except -1
+    cdef int PySlice_GetIndicesEx "_lx_PySlice_GetIndicesEx" (
+            object slice, Py_ssize_t length,
+            Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
+            Py_ssize_t *slicelength) except -1
 
     cdef object PyObject_RichCompare(object o1, object o2, int op)
     cdef int PyObject_RichCompareBool(object o1, object o2, int op)