added check for cling in CppInterOp.cpp

Author: kr-2003

lib/Interpreter/CppInterOp.cpp

@@ -3672,6 +3672,14 @@ namespace Cpp {
                          complete_column);
   }
 
-  int Undo(unsigned N) { return getInterp().undo(N); }
+  int Undo(unsigned N) {
+#ifdef CPPINTEROP_USE_CLING
+    llvm::logAllUnhandledErrors(Undo(N), llvm::errs(),
+                                "Undo not implemented in Cling");
+    return compat::Interpreter::kFailure;
+#else
+    return getInterp().undo(N);
+#endif
+  }
 
   } // end namespace Cpp

lib/Interpreter/CppInterOpInterpreter.h

@@ -430,18 +430,12 @@ class Interpreter {
   }
 
   CompilationResult undo(unsigned N = 1) {
-#ifdef CPPINTEROP_USE_CLING
-    llvm::logAllUnhandledErrors(Undo(N), llvm::errs(),
-                                "Undo not implemented in Cling");
-    return kFailure;
-#else
     if (llvm::Error Err = Undo(N)) {
       llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(),
                                   "Failed to undo via ::undo");
       return kFailure;
     }
     return kSuccess;
-#endif
   }
 
 }; // Interpreter