Default to int Py_BuildValue format in py24 for Py_ssize_t

Cython/Compiler/ExprNodes.py

@@ -7136,8 +7136,9 @@ class CythonArrayNode(ExprNode):
 
         code.putln("%s = __pyx_format_from_typeinfo(&%s);" %
                                                 (format_temp, type_info))
-        code.putln('%s = Py_BuildValue("(%s)", %s);' % (shapes_temp,
-                                                        "n" * len(shapes),
+        buildvalue_fmt = " __PYX_BUILD_PY_SSIZE_T " * len(shapes)
+        code.putln('%s = Py_BuildValue("(" %s ")", %s);' % (shapes_temp,
+                                                            buildvalue_fmt,
                                                             ", ".join(shapes)))
 
         err = "!%s || !%s || !PyBytes_AsString(%s)" % (format_temp,

Cython/Utility/ModuleSetupCode.c

@@ -38,6 +38,9 @@
   #define PyNumber_Index(o)    PyNumber_Int(o)
   #define PyIndex_Check(o)     PyNumber_Check(o)
   #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
+  #define __PYX_BUILD_PY_SSIZE_T "i"
+#else
+  #define __PYX_BUILD_PY_SSIZE_T "n"
 #endif
 
 #if PY_VERSION_HEX < 0x02060000