Add -3 option to the interpreter to warn about features that are
deprecated and will be changed/removed in Python 3.0.
This patch is mostly from Anthony. I tweaked some format and added
a little doc.
diff --git a/Include/pydebug.h b/Include/pydebug.h
index db3b656..3282dc1 100644
--- a/Include/pydebug.h
+++ b/Include/pydebug.h
@@ -21,6 +21,8 @@
on the command line, and is used in 2.2 by ceval.c to make all "/" divisions
true divisions (which they will be in 3.0). */
PyAPI_DATA(int) _Py_QnewFlag;
+/* Warn about 3.x issues */
+PyAPI_DATA(int) Py_Py3kWarningFlag;
/* this is a wrapper around getenv() that pays attention to
Py_IgnoreEnvironmentFlag. It should be used for getting variables like