fix C++ warning

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 29cd825..84751c7 100755 (executable)
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -8281,9 +8281,8 @@ class CythonArrayNode(ExprNode):
         code.putln("%s = __pyx_format_from_typeinfo(&%s);" %
                                                 (format_temp, type_info))
         buildvalue_fmt = " __PYX_BUILD_PY_SSIZE_T " * len(shapes)
-        code.putln('%s = Py_BuildValue("(" %s ")", %s);' % (shapes_temp,
-                                                            buildvalue_fmt,
-                                                            ", ".join(shapes)))
+        code.putln('%s = Py_BuildValue((char*) "(" %s ")", %s);' % (
+            shapes_temp, buildvalue_fmt, ", ".join(shapes)))
 
         err = "!%s || !%s || !PyBytes_AsString(%s)" % (format_temp,
                                                        shapes_temp,