From cec897edc43de3504b0c8bf7ed6c762a176004f0 Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Tue, 8 Apr 2008 16:05:23 -0400
Subject: ENH: half fix for 6688, don't let [ count go negative

---
 Source/cmSystemTools.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index bf723c5..f6d8e6c 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -1270,7 +1270,10 @@ void cmSystemTools::ExpandListArgument(const std::string& arg,
         } break;
       case ']':
         {
-        --squareNesting;
+        if(squareNesting)
+          {
+          --squareNesting;
+          }
         newArgVec.push_back(*c);
         } break;
       case ';':
-- 
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