From a06dcdba970b5ea1cf570de1a9f7f038af849496 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 16 Jan 2008 11:24:41 -0500
Subject: ENH: Allow LIST(APPEND) command to append nothing.

---
 Source/cmListCommand.cxx | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Source/cmListCommand.cxx b/Source/cmListCommand.cxx
index c00f6eb..b7519ab 100644
--- a/Source/cmListCommand.cxx
+++ b/Source/cmListCommand.cxx
@@ -179,12 +179,18 @@ bool cmListCommand::HandleGetCommand(std::vector<std::string> const& args)
 //----------------------------------------------------------------------------
 bool cmListCommand::HandleAppendCommand(std::vector<std::string> const& args)
 {
-  if(args.size() < 3)
+  if(args.size() < 2)
     {
-    this->SetError("sub-command APPEND requires at least two arguments.");
+    this->SetError("sub-command APPEND requires at least one argument.");
     return false;
     }
 
+  // Skip if nothing to append.
+  if(args.size() < 3)
+    {
+    return true;
+    }
+
   const std::string& listName = args[1];
   // expand the variable
   std::string listString;
-- 
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