/*
 * Copyright 2016-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.facebook.buck.cxx.toolchain;

import com.facebook.buck.core.toolchain.tool.Tool;
import com.facebook.buck.io.file.MorePaths;
import com.google.common.collect.ImmutableList;
import java.util.Optional;

public class GccCompiler extends DefaultCompiler {
  /**
   * Whether we should use -MD (dependency list) or -H (dependency tree) for dependency tracking.
   */
  /** The tree may be used for detailed untracked header error message but may hurt performance. */
  private final boolean useDependencyTree;

  private final DependencyTrackingMode dependencyTrackingMode;

  public GccCompiler(Tool tool, boolean useDependencyTree) {
    this(tool, useDependencyTree, true);
  }

  public GccCompiler(Tool tool, boolean useDependencyTree, boolean useUnixPathSeparator) {
    super(tool, useUnixPathSeparator);
    this.useDependencyTree = useDependencyTree;
    if (useDependencyTree) {
      dependencyTrackingMode = DependencyTrackingMode.SHOW_HEADERS;
    } else {
      dependencyTrackingMode = DependencyTrackingMode.MAKEFILE;
    }
  }

  @Override
  public DependencyTrackingMode getDependencyTrackingMode() {
    return dependencyTrackingMode;
  }

  @Override
  public ImmutableList<String> outputDependenciesArgs(String outputPath) {
    if (useDependencyTree) {
      return ImmutableList.of("-H");
    } else {
      return ImmutableList.of("-MD", "-MF", MorePaths.pathWithUnixSeparators(outputPath));
    }
  }

  @Override
  public boolean isArgFileSupported() {
    return true;
  }

  @Override
  public Optional<ImmutableList<String>> getFlagsForColorDiagnostics() {
    return Optional.of(ImmutableList.of("-fdiagnostics-color=always"));
  }
}

@@ -641,16 +641,68 @@
 chain;%0A%0A
+import com.facebook.buck.core.rulekey.AddToRuleKey;%0A
 import c
@@ -1127,16 +1127,30 @@
 e. */%0A  
+@AddToRuleKey 
 private 
@@ -1185,16 +1185,30 @@
 ree;%0A%0A  
+@AddToRuleKey 
 private 

Add @AddToRuleKey to GccCompiler fields