BUG: When error occurs, try compiles should still work

Source/cmSystemTools.h

@@ -98,6 +98,10 @@ public:
     {
       cmSystemTools::s_FatalErrorOccured = true;
     }
+  static void SetErrorOccured()
+    {
+      cmSystemTools::s_ErrorOccured = true;
+    }
  ///! Return true if there was an error at any point.
   static bool GetFatalErrorOccured() 
     {

Source/cmTryCompileCommand.cxx

@@ -217,11 +217,18 @@ int cmTryCompileCommand::CoreTryCompileCode(
       }
     }
   
+  bool erroroc = cmSystemTools::GetErrorOccuredFlag();
+  cmSystemTools::ResetErrorOccuredFlag();
   std::string output;
   // actually do the try compile now that everything is setup
   int res = mf->TryCompile(sourceDirectory, binaryDirectory,
                            projectName, targetName, &cmakeFlags, &output);
   
+  if ( erroroc )
+    {
+    cmSystemTools::SetErrorOccured();
+    }
+  
   // set the result var to the return value to indicate success or failure
   mf->AddCacheDefinition(argv[0].c_str(), (res == 0 ? "TRUE" : "FALSE"),
                          "Result of TRY_COMPILE",