Expose Apple Multi-architecture Split Transition to Skylark.

This omits validation for this transition, which will follow in a future change.

RELNOTES: None.
PiperOrigin-RevId: 174183651

1 files changed, 13 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/MultiArchSplitTransitionProvider.java b/src/main/java/com/google/devtools/build/lib/rules/objc/MultiArchSplitTransitionProvider.java
index 7d0e9af46f..394c2202b7 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/MultiArchSplitTransitionProvider.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/MultiArchSplitTransitionProvider.java
@@ -35,6 +35,8 @@ import com.google.devtools.build.lib.rules.apple.ApplePlatform;
 import com.google.devtools.build.lib.rules.apple.ApplePlatform.PlatformType;
 import com.google.devtools.build.lib.rules.apple.DottedVersion;
 import com.google.devtools.build.lib.rules.objc.ObjcRuleClasses.PlatformRule;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkValue;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -42,7 +44,7 @@ import java.util.stream.Collectors;
  * {@link SplitTransitionProvider} implementation for multi-architecture apple rules which can
  * accept different apple platform types (such as ios or watchos).
  */
-public class MultiArchSplitTransitionProvider implements SplitTransitionProvider {
+public class MultiArchSplitTransitionProvider implements SplitTransitionProvider, SkylarkValue {
 
   @VisibleForTesting
   static final String UNSUPPORTED_PLATFORM_TYPE_ERROR_FORMAT =
@@ -147,6 +149,16 @@ public class MultiArchSplitTransitionProvider implements SplitTransitionProvider
     return new AppleBinaryTransition(platformType, minimumOsVersion);
   }
 
+  @Override
+  public boolean isImmutable() {
+    return true;
+  }
+
+  @Override
+  public void repr(SkylarkPrinter printer) {
+    printer.append("apple_common.multi_arch_split");
+  }
+
   /**
    * Transition that results in one configured target per architecture specified in the
    * platform-specific cpu flag for a particular platform type (for example, --watchos_cpus