From accf93fc12071b603de40a00d059a2bbbe7f2fe2 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 7 Aug 2006 17:22:58 -0400
Subject: ENH: Added undocumented option -E cmake_unimplemented_variable to
 help print useful error messages for unimplemented features on a given
 platform.

---
 Source/cmake.cxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index aaa743f..3afbf67 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -1184,6 +1184,18 @@ int cmake::ExecuteCMakeCommand(std::vector<std::string>& args)
       return cmake::ExecuteLinkScript(args);
       }
 
+    // Internal CMake unimplemented feature notification.
+    else if (args[1] == "cmake_unimplemented_variable")
+      {
+      std::cerr << "Feature not implemented for this platform.";
+      if(args.size() == 3)
+        {
+        std::cerr << "  Variable " << args[2] << " is not set.";
+        }
+      std::cerr << std::endl;
+      return 1;
+      }
+
 #ifdef CMAKE_BUILD_WITH_CMAKE
     // Internal CMake color makefile support.
     else if (args[1] == "cmake_echo_color")
-- 
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