1 files changed, 17 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppRuleClasses.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppRuleClasses.java
index 04c3368cc2..1e6e1b7fb8 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppRuleClasses.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppRuleClasses.java
@@ -33,11 +33,14 @@ import static com.google.devtools.build.lib.rules.cpp.CppFileTypes.VERSIONED_SHA
 import com.google.devtools.build.lib.analysis.LanguageDependentFragment.LibraryLanguage;
 import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
 import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.packages.Attribute;
 import com.google.devtools.build.lib.packages.Attribute.LateBoundLabel;
 import com.google.devtools.build.lib.packages.Attribute.Transition;
 import com.google.devtools.build.lib.packages.AttributeMap;
 import com.google.devtools.build.lib.packages.ImplicitOutputsFunction.SafeImplicitOutputsFunction;
 import com.google.devtools.build.lib.packages.Rule;
+import com.google.devtools.build.lib.packages.RuleTransitionFactory;
+import com.google.devtools.build.lib.rules.cpp.transitions.EnableLipoTransition;
 import com.google.devtools.build.lib.rules.test.InstrumentedFilesCollector.InstrumentationSpec;
 import com.google.devtools.build.lib.util.FileTypeSet;
 
@@ -84,6 +87,20 @@ public class CppRuleClasses {
   }
 
   /**
+   * Rule transition factory that enables LIPO on the LIPO context binary (i.e. applies a DATA ->
+   * TARGET transition).
+   *
+   * <p>This is how dynamic configurations enable LIPO on the LIPO context.
+   */
+  public static final RuleTransitionFactory LIPO_ON_DEMAND =
+      new RuleTransitionFactory() {
+        @Override
+        public Attribute.Transition buildTransitionFor(Rule rule) {
+          return new EnableLipoTransition(rule.getLabel());
+        }
+      };
+
+  /**
    * Label of a pseudo-filegroup that contains all crosstool and libcfiles for all configurations,
    * as specified on the command-line.
    */