diff --git a/dev/core/src/com/google/gwt/dev/PrecompileTaskArgProcessor.java b/dev/core/src/com/google/gwt/dev/PrecompileTaskArgProcessor.java
index 6ad42338ba..0adbca2622 100644
--- a/dev/core/src/com/google/gwt/dev/PrecompileTaskArgProcessor.java
+++ b/dev/core/src/com/google/gwt/dev/PrecompileTaskArgProcessor.java
@@ -70,7 +70,7 @@ public PrecompileTaskArgProcessor(PrecompileTaskOptions options) {
     registerHandler(new ArgHandlerDumpSignatures());
     registerHandler(new ArgHandlerEnableAssertions(options));
     registerHandler(new ArgHandlerFragmentCount(options));
-    registerHandler(new ArgHandlerFragmentMerge(options));
+    registerHandler(new ArgHandlerFragmentMerge());
     registerHandler(new ArgHandlerGenDir(options));
     registerHandler(new ArgHandlerGenerateJsInteropExports(options));
     registerHandler(new ArgHandlerFilterJsInteropExports(options));
diff --git a/dev/core/src/com/google/gwt/dev/jjs/JJSOptionsImpl.java b/dev/core/src/com/google/gwt/dev/jjs/JJSOptionsImpl.java
index 7a5c865768..2d9e8c3c01 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/JJSOptionsImpl.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/JJSOptionsImpl.java
@@ -35,7 +35,6 @@ public class JJSOptionsImpl implements JJSOptions, Serializable {
   private boolean disableClassMetadata = false;
   private boolean enableAssertions;
   private int fragmentCount = -1;
-  private int fragmentsMerge = -1;
   private boolean inlineLiteralParameters = true;
   private boolean jsonSoycEnabled = false;
   private JsNamespaceOption namespace = JsNamespaceOption.NONE;
@@ -97,7 +96,7 @@ public int getFragmentCount() {
 
   @Override
   public int getFragmentsMerge() {
-    return fragmentsMerge;
+    return -1;
   }
 
   @Override
@@ -210,7 +209,6 @@ public void setFragmentCount(int numFragments) {
 
   @Override
   public void setFragmentsMerge(int numFragments) {
-    this.fragmentsMerge = numFragments;
   }
 
   @Override
diff --git a/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java b/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java
index 91359c61a1..7c857d5c61 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java
@@ -578,18 +578,6 @@ private Pair<SyntheticArtifact, MultipleDependencyGraphRecorder> splitJsIntoFrag
       ByteArrayOutputStream baos = new ByteArrayOutputStream();
 
       int expectedFragmentCount = options.getFragmentCount();
-      // -1 is the default value, we trap 0 just in case (0 is not a legal value in any case)
-      if (expectedFragmentCount <= 0) {
-        // Fragment count not set check fragments merge.
-        int numberOfMerges = options.getFragmentsMerge();
-        if (numberOfMerges > 0) {
-          // + 1 for left over, + 1 for initial gave us the total number
-          // of fragments without splitting.
-          expectedFragmentCount =
-              Math.max(0, jprogram.getRunAsyncs().size() + 2 - numberOfMerges);
-        }
-      }
-
       int minFragmentSize = properties.getConfigurationProperties()
           .getInteger(CodeSplitters.MIN_FRAGMENT_SIZE, 0);
 
diff --git a/dev/core/src/com/google/gwt/dev/util/arg/ArgHandlerFragmentMerge.java b/dev/core/src/com/google/gwt/dev/util/arg/ArgHandlerFragmentMerge.java
index 51a6687cd4..8042f2e498 100644
--- a/dev/core/src/com/google/gwt/dev/util/arg/ArgHandlerFragmentMerge.java
+++ b/dev/core/src/com/google/gwt/dev/util/arg/ArgHandlerFragmentMerge.java
@@ -15,37 +15,14 @@
  */
 package com.google.gwt.dev.util.arg;
 
-import com.google.gwt.util.tools.ArgHandlerInt;
+import com.google.gwt.util.tools.ArgHandlerNoopDeprecatedFlag;
 
 /**
  * An ArgHandler to provide the -XfragmentMerge flag.
  */
-public class ArgHandlerFragmentMerge extends ArgHandlerInt {
-
-  private final OptionFragmentsMerge option;
-
-  public ArgHandlerFragmentMerge(OptionFragmentsMerge option) {
-    this.option = option;
-  }
-
-  @Override
-  public String getPurpose() {
-    return "DEPRECATED (use -XfragmentCount instead): " +
-      "Enables Fragment merging code splitter.";
-  }
-
-  @Override
-  public String getTag() {
-    return "-XfragmentMerge";
-  }
-
-  @Override
-  public String[] getTagArgs() {
-    return new String[] {"numFragments"};
-  }
-
-  @Override
-  public void setInt(int value) {
-    option.setFragmentsMerge(value);
+@Deprecated
+public class ArgHandlerFragmentMerge extends ArgHandlerNoopDeprecatedFlag {
+  public ArgHandlerFragmentMerge() {
+    super(1, "numFragments");
   }
 }
diff --git a/dev/core/src/com/google/gwt/dev/util/arg/OptionFinalProperties.java b/dev/core/src/com/google/gwt/dev/util/arg/OptionFinalProperties.java
index 14f63fe61a..c6950858a8 100644
--- a/dev/core/src/com/google/gwt/dev/util/arg/OptionFinalProperties.java
+++ b/dev/core/src/com/google/gwt/dev/util/arg/OptionFinalProperties.java
@@ -16,12 +16,10 @@
 import com.google.gwt.dev.cfg.Properties;
 
 /**
- * Option providing a set of properties representing the final property state that will be reached
- * at the root of a library compile tree.
- * <p>
- * Library compilation uses this as a guide for how long it must delay generator execution to avoid
- * having to rerun the same generator again later when properties it depends on change.
+ * Deprecated for removal, no longer read by the compiler since the remainder of the
+ * library feature was removed.
  */
+@Deprecated
 public interface OptionFinalProperties {
 
   /**
diff --git a/dev/core/src/com/google/gwt/dev/util/arg/OptionFragmentsMerge.java b/dev/core/src/com/google/gwt/dev/util/arg/OptionFragmentsMerge.java
index 8e0650e37f..7b8f48653b 100644
--- a/dev/core/src/com/google/gwt/dev/util/arg/OptionFragmentsMerge.java
+++ b/dev/core/src/com/google/gwt/dev/util/arg/OptionFragmentsMerge.java
@@ -18,6 +18,7 @@
 /**
  * Enable the new code splitter that auto-partitions.
  */
+@Deprecated
 public interface OptionFragmentsMerge {
   // TODO(acleung): Delete this in favor of -XfragmentCount