From 326d15a3294e3b43de534130a4b655ddb454fbfb Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 27 May 2014 16:03:51 -0400
Subject: [PATCH] cmake: Tolerate missing HELPSTRING on compiler change

Teach cmake::HandleDeleteCacheVariables to tolerate a missing HELPSTRING
(NULL pointer) when saving cache entries.  In the absence of other bugs
this should not be possible, but avoid the crash just in case.
---
 Source/cmake.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index abbabe762..4f14d73e1 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -1231,7 +1231,10 @@ int cmake::HandleDeleteCacheVariables(const char* var)
     if(ci.Find(save.key.c_str()))
       {
       save.type = ci.GetType();
-      save.help = ci.GetProperty("HELPSTRING");
+      if(const char* help = ci.GetProperty("HELPSTRING"))
+        {
+        save.help = help;
+        }
       }
     saved.push_back(save);
     }