From f4e9a5e5ea6c960052af860a2b26b2c1dd4f1d3c Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Wed, 22 Mar 2006 17:21:45 -0500
Subject: ENH: do not dereference empty stl vectors

---
 Source/cmExecuteProcessCommand.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/cmExecuteProcessCommand.cxx b/Source/cmExecuteProcessCommand.cxx
index 1d9db30..4090529 100644
--- a/Source/cmExecuteProcessCommand.cxx
+++ b/Source/cmExecuteProcessCommand.cxx
@@ -295,11 +295,11 @@ bool cmExecuteProcessCommand::InitialPass(std::vector<std::string> const& args)
   cmExecuteProcessCommandFixText(tempError);
 
   // Store the output obtained.
-  if(!output_variable.empty())
+  if(!output_variable.empty() && tempOutput.size())
     {
     this->Makefile->AddDefinition(output_variable.c_str(), &*tempOutput.begin());
     }
-  if(!merge_output && !error_variable.empty())
+  if(!merge_output && !error_variable.empty() && tempError.size())
     {
     this->Makefile->AddDefinition(error_variable.c_str(), &*tempError.begin());
     }
-- 
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