From ffc0b5e4de02873ee825f70f4c434c8cb3b7edde Mon Sep 17 00:00:00 2001
From: Andy Cedilnik <andy.cedilnik@kitware.com>
Date: Thu, 15 Feb 2007 15:07:16 -0500
Subject: [PATCH] BUG: Overwrite the symlink if it already exists. Close Bug
 #4418 - cmake -create-symlink doesn't overwrite existing symlinks

---
 Source/cmake.cxx | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 3f6143aa39..7edf2eabae 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -1072,6 +1072,22 @@ int cmake::ExecuteCMakeCommand(std::vector<std::string>& args)
     // supporting them.
     else if (args[1] == "create_symlink" && args.size() == 4)
       {
+      const char* destinationFileName = args[3].c_str();
+      if ( cmSystemTools::FileExists(destinationFileName) )
+        {
+        if ( cmSystemTools::FileIsSymlink(destinationFileName) )
+          {
+          if ( !cmSystemTools::RemoveFile(destinationFileName) ||
+            cmSystemTools::FileExists(destinationFileName) )
+            {
+            return 0;
+            }
+          }
+        else
+          {
+          return 0;
+          }
+        }
       return cmSystemTools::CreateSymlink(args[2].c_str(),
                                           args[3].c_str())? 0:1;
       }