py-api: store frequently used strings as unicode PyObject's to avoid creating/distroying every time.

also fix for cmake warning

source/blender/python/intern/bpy_intern_string.c

@@ -0,0 +1,57 @@
+/*
+ * $Id:
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Campbell Barton
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/python/intern/bpy_intern_string.c
+ *  \ingroup pythonintern
+ */
+
+#include <Python.h>
+
+PyObject *bpy_intern_str_register;
+PyObject *bpy_intern_str_unregister;
+PyObject *bpy_intern_str_bl_rna;
+PyObject *bpy_intern_str_order;
+PyObject *bpy_intern_str_attr;
+PyObject *bpy_intern_str___slots__;
+PyObject *bpy_intern_str___bases__;
+
+void bpy_intern_string_init(void)
+{
+	bpy_intern_str_register= PyUnicode_FromString("register");
+	bpy_intern_str_unregister= PyUnicode_FromString("unregister");;
+	bpy_intern_str_bl_rna= PyUnicode_FromString("bl_rna");
+	bpy_intern_str_order= PyUnicode_FromString("order");
+	bpy_intern_str_attr= PyUnicode_FromString("attr");
+	bpy_intern_str___slots__= PyUnicode_FromString("__slots__");
+}
+
+void bpy_intern_string_exit(void)
+{
+	Py_DECREF(bpy_intern_str_register);
+	Py_DECREF(bpy_intern_str_unregister);
+	Py_DECREF(bpy_intern_str_bl_rna);
+	Py_DECREF(bpy_intern_str_order);
+	Py_DECREF(bpy_intern_str_attr);
+	Py_DECREF(bpy_intern_str___slots__);
+}