--- ../src-base/minecraft/cpw/mods/fml/relauncher/CoreModManager.java
+++ ../src-work/minecraft/cpw/mods/fml/relauncher/CoreModManager.java
@@ -27,10 +27,14 @@
 import java.util.Map;
 import java.util.jar.Attributes;
 import java.util.jar.JarFile;
+
+import kcauldron.KCauldronClassTransformer;
 import net.minecraft.launchwrapper.ITweaker;
 import net.minecraft.launchwrapper.Launch;
 import net.minecraft.launchwrapper.LaunchClassLoader;
+
 import org.apache.logging.log4j.Level;
+
 import com.google.common.base.Strings;
 import com.google.common.base.Throwables;
 import com.google.common.collect.ImmutableList;
@@ -38,6 +42,7 @@
 import com.google.common.collect.Maps;
 import com.google.common.collect.ObjectArrays;
 import com.google.common.primitives.Ints;
+
 import cpw.mods.fml.common.FMLLog;
 import cpw.mods.fml.common.asm.transformers.ModAccessTransformer;
 import cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker;
@@ -94,6 +99,11 @@
         @Override
         public void injectIntoClassLoader(LaunchClassLoader classLoader)
         {
+        	// Cauldron start
+        	// Register own ClassTransformer for some needs
+        	classLoader.registerTransformer("kcauldron.KCauldronClassTransformer");
+        	KCauldronClassTransformer.DEV = deobfuscatedEnvironment;
+        	// Cauldron end
             FMLRelaunchLog.fine("Injecting coremod %s {%s} class transformers", name, coreModInstance.getClass().getName());
             if (coreModInstance.getASMTransformerClass() != null) for (String transformer : coreModInstance.getASMTransformerClass())
             {
@@ -153,6 +163,9 @@
 
     }
 
+    // Cauldron - group output of @MCVersion warnings
+    private static List<String> noVersionAnnotationCoreMods = new ArrayList<String>();
+
     public static void handleLaunch(File mcDir, LaunchClassLoader classLoader, FMLTweaker tweaker)
     {
         CoreModManager.mcDir = mcDir;
@@ -212,6 +225,19 @@
             loadCoreMod(classLoader, coreModClassName, null);
         }
         discoverCoreMods(mcDir, classLoader);
+        // Cauldron start - group output of @MCVersion warnings
+        if (!noVersionAnnotationCoreMods.isEmpty())
+        {
+            FMLRelaunchLog
+                    .warning("The following coremods do not have a @MCVersion annotation. They may cause problems if this is not the correct version of Minecraft for them.");
+            StringBuilder sb = new StringBuilder("Missing @MCVersion: ");
+            for (String className : noVersionAnnotationCoreMods)
+            {
+                sb.append(className).append("  ");
+            }
+            FMLRelaunchLog.warning(sb.toString());
+        }
+        // Cauldron end
 
     }
 
@@ -424,8 +450,11 @@
             MCVersion requiredMCVersion = coreModClazz.getAnnotation(IFMLLoadingPlugin.MCVersion.class);
             if (!Arrays.asList(rootPlugins).contains(coreModClass) && (requiredMCVersion == null || Strings.isNullOrEmpty(requiredMCVersion.value())))
             {
-                FMLRelaunchLog.log(Level.WARN, "The coremod %s does not have a MCVersion annotation, it may cause issues with this version of Minecraft",
-                        coreModClass);
+                // Cauldron start - group output of @MCVersion warnings
+                // FMLRelaunchLog.log(Level.WARN, "The coremod %s does not have a MCVersion annotation, it may cause issues with this version of Minecraft",
+                //        coreModClass);
+                noVersionAnnotationCoreMods.add(coreModClass);
+                // Cauldron end
             }
             else if (requiredMCVersion != null && !FMLInjectionData.mccversion.equals(requiredMCVersion.value()))
             {