From 53d01f6fb437ff2fc87157f71cb007486d8956ea Mon Sep 17 00:00:00 2001
From: Andrew Johnson <anj@aps.anl.gov>
Date: Wed, 3 Jun 2015 00:15:39 -0500
Subject: [PATCH] Show how to make time providers backwards-compatible

---
 documentation/RELEASE_NOTES.html | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index 48dacb281..5a3f74280 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -29,6 +29,19 @@ it in source code will no longer compile. The identifier epicsTimeOK still exist
 and has the value 0 as before, so most code that uses these APIs can be changed in
 a way that is backwards-compatible with the previous return status.</p>
 
+<p>Time providers that have to return a status value and still need to be built
+with earlier versions of Base can define the necessary status symbols like this:</p>
+
+<blockquote><pre>
+#include "epicsTime.h"
+
+#ifndef M_time
+/* S_time_... status values were not provided before Base 3.16 */
+#define S_time_unsynchronized epicsTimeERROR
+#define S_time_...whatever... epicsTimeERROR
+#endif
+</pre></blockquote>
+
 <h3>Callback subsystem API</h3>
 
 <p>Added a new macro <tt>callbackGetPriority(prio, callback)</tt> to the