The fully link action in experimental_objc_binary has crosstool inputs.

--
MOS_MIGRATED_REVID=139576152
diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/CrosstoolCompilationSupport.java b/src/main/java/com/google/devtools/build/lib/rules/objc/CrosstoolCompilationSupport.java
index cd6789d..3e52999 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/CrosstoolCompilationSupport.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/CrosstoolCompilationSupport.java
@@ -37,6 +37,7 @@
 import com.google.devtools.build.lib.rules.cpp.CcToolchainFeatures.Variables.VariablesExtension;
 import com.google.devtools.build.lib.rules.cpp.CcToolchainProvider;
 import com.google.devtools.build.lib.rules.cpp.CppCompileAction;
+import com.google.devtools.build.lib.rules.cpp.CppHelper;
 import com.google.devtools.build.lib.rules.cpp.CppLinkAction;
 import com.google.devtools.build.lib.rules.cpp.CppLinkActionBuilder;
 import com.google.devtools.build.lib.rules.cpp.CppRuleClasses;
@@ -147,6 +148,7 @@
             .addActionInputs(objcProvider.getObjcLibraries())
             .addActionInputs(objcProvider.getCcLibraries())
             .addActionInputs(objcProvider.get(IMPORTED_LIBRARY).toSet())
+            .setCrosstoolInputs(CppHelper.getToolchain(ruleContext).getLink())
             .setLinkType(LinkTargetType.OBJC_FULLY_LINKED_ARCHIVE)
             .setLinkStaticness(LinkStaticness.FULLY_STATIC)
             .setLibraryIdentifier(libraryIdentifier)