config file: only allow GlobalInitFile option to hooks block, one more error check

preprocessor/ConfigFile.cc

@@ -220,9 +220,18 @@ ConfigFile::getConfigFileInfo(const string &config_file)
           trim(tokenizedLine.back());
 
           if (inHooks)
-            {
             if (!tokenizedLine.front().compare("GlobalInitFile"))
+              if (global_init_file.empty())
                 global_init_file = tokenizedLine.back();
+              else
+                {
+                  cerr << "ERROR: May not have more than one GlobalInitFile option in [hooks] block." << endl;
+                  exit(EXIT_FAILURE);
+                }
+            else
+              {
+                cerr << "ERROR: Unrecognized option " << tokenizedLine.front() << " in [hooks] block." << endl;
+                exit(EXIT_FAILURE);
               }
           else
             if (!tokenizedLine.front().compare("Name"))