Index: llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter3/KaleidoscopeJIT.h
===================================================================
--- llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter3/KaleidoscopeJIT.h
+++ llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter3/KaleidoscopeJIT.h
@@ -64,28 +64,30 @@
 public:
   KaleidoscopeJIT()
       : TM(EngineBuilder().selectTarget()), DL(TM->createDataLayout()),
-        ObjectLayer(ES,
+        ObjectLayer(AcknowledgeORCv1Deprecation, ES,
                     [this](VModuleKey K) {
                       return LegacyRTDyldObjectLinkingLayer::Resources{
                           std::make_shared<SectionMemoryManager>(),
                           Resolvers[K]};
                     }),
-        CompileLayer(ObjectLayer, SimpleCompiler(*TM)),
-        OptimizeLayer(CompileLayer,
+        CompileLayer(AcknowledgeORCv1Deprecation, ObjectLayer,
+                     SimpleCompiler(*TM)),
+        OptimizeLayer(AcknowledgeORCv1Deprecation, CompileLayer,
                       [this](std::unique_ptr<Module> M) {
                         return optimizeModule(std::move(M));
                       }),
         CompileCallbackManager(cantFail(orc::createLocalCompileCallbackManager(
             TM->getTargetTriple(), ES, 0))),
-        CODLayer(ES, OptimizeLayer,
-                 [&](orc::VModuleKey K) { return Resolvers[K]; },
-                 [&](orc::VModuleKey K, std::shared_ptr<SymbolResolver> R) {
-                   Resolvers[K] = std::move(R);
-                 },
-                 [](Function &F) { return std::set<Function *>({&F}); },
-                 *CompileCallbackManager,
-                 orc::createLocalIndirectStubsManagerBuilder(
-                     TM->getTargetTriple())) {
+        CODLayer(
+            AcknowledgeORCv1Deprecation, ES, OptimizeLayer,
+            [&](orc::VModuleKey K) { return Resolvers[K]; },
+            [&](orc::VModuleKey K, std::shared_ptr<SymbolResolver> R) {
+              Resolvers[K] = std::move(R);
+            },
+            [](Function &F) { return std::set<Function *>({&F}); },
+            *CompileCallbackManager,
+            orc::createLocalIndirectStubsManagerBuilder(
+                TM->getTargetTriple())) {
     llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);
   }
 
Index: llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter4/KaleidoscopeJIT.h
===================================================================
--- llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter4/KaleidoscopeJIT.h
+++ llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter4/KaleidoscopeJIT.h
@@ -105,13 +105,14 @@
             },
             [](Error Err) { cantFail(std::move(Err), "lookupFlags failed"); })),
         TM(EngineBuilder().selectTarget()), DL(TM->createDataLayout()),
-        ObjectLayer(ES,
+        ObjectLayer(AcknowledgeORCv1Deprecation, ES,
                     [this](VModuleKey K) {
                       return LegacyRTDyldObjectLinkingLayer::Resources{
                           std::make_shared<SectionMemoryManager>(), Resolver};
                     }),
-        CompileLayer(ObjectLayer, SimpleCompiler(*TM)),
-        OptimizeLayer(CompileLayer,
+        CompileLayer(AcknowledgeORCv1Deprecation, ObjectLayer,
+                     SimpleCompiler(*TM)),
+        OptimizeLayer(AcknowledgeORCv1Deprecation, CompileLayer,
                       [this](std::unique_ptr<Module> M) {
                         return optimizeModule(std::move(M));
                       }),
Index: llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter5/KaleidoscopeJIT.h
===================================================================
--- llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter5/KaleidoscopeJIT.h
+++ llvm/trunk/examples/Kaleidoscope/BuildingAJIT/Chapter5/KaleidoscopeJIT.h
@@ -113,14 +113,15 @@
         TM(EngineBuilder().selectTarget(Triple(Remote.getTargetTriple()), "",
                                         "", SmallVector<std::string, 0>())),
         DL(TM->createDataLayout()),
-        ObjectLayer(ES,
+        ObjectLayer(AcknowledgeORCv1Deprecation, ES,
                     [this](VModuleKey K) {
                       return LegacyRTDyldObjectLinkingLayer::Resources{
                           cantFail(this->Remote.createRemoteMemoryManager()),
                           Resolver};
                     }),
-        CompileLayer(ObjectLayer, SimpleCompiler(*TM)),
-        OptimizeLayer(CompileLayer,
+        CompileLayer(AcknowledgeORCv1Deprecation, ObjectLayer,
+                     SimpleCompiler(*TM)),
+        OptimizeLayer(AcknowledgeORCv1Deprecation, CompileLayer,
                       [this](std::unique_ptr<Module> M) {
                         return optimizeModule(std::move(M));
                       }),
Index: llvm/trunk/examples/Kaleidoscope/include/KaleidoscopeJIT.h
===================================================================
--- llvm/trunk/examples/Kaleidoscope/include/KaleidoscopeJIT.h
+++ llvm/trunk/examples/Kaleidoscope/include/KaleidoscopeJIT.h
@@ -45,17 +45,16 @@
   KaleidoscopeJIT()
       : Resolver(createLegacyLookupResolver(
             ES,
-            [this](const std::string &Name) {
-              return findMangledSymbol(Name);
-            },
+            [this](const std::string &Name) { return findMangledSymbol(Name); },
             [](Error Err) { cantFail(std::move(Err), "lookupFlags failed"); })),
         TM(EngineBuilder().selectTarget()), DL(TM->createDataLayout()),
-        ObjectLayer(ES,
+        ObjectLayer(AcknowledgeORCv1Deprecation, ES,
                     [this](VModuleKey) {
                       return ObjLayerT::Resources{
                           std::make_shared<SectionMemoryManager>(), Resolver};
                     }),
-        CompileLayer(ObjectLayer, SimpleCompiler(*TM)) {
+        CompileLayer(AcknowledgeORCv1Deprecation, ObjectLayer,
+                     SimpleCompiler(*TM)) {
     llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);
   }
 
Index: llvm/trunk/include/llvm/ExecutionEngine/ExecutionEngine.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ llvm/trunk/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -21,6 +21,7 @@
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ExecutionEngine/JITSymbol.h"
+#include "llvm/ExecutionEngine/OrcV1Deprecation.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Object/Binary.h"
@@ -634,7 +635,13 @@
   }
 
   // Use OrcMCJITReplacement instead of MCJIT. Off by default.
-  void setUseOrcMCJITReplacement(bool UseOrcMCJITReplacement) {
+  LLVM_ATTRIBUTE_DEPRECATED(
+      inline void setUseOrcMCJITReplacement(bool UseOrcMCJITReplacement),
+      "ORCv1 utilities (including OrcMCJITReplacement) are deprecated. Please "
+      "use ORCv2/LLJIT instead (see docs/ORCv2.rst)");
+
+  void setUseOrcMCJITReplacement(ORCv1DeprecationAcknowledgement,
+                                 bool UseOrcMCJITReplacement) {
     this->UseOrcMCJITReplacement = UseOrcMCJITReplacement;
   }
 
@@ -658,6 +665,10 @@
   ExecutionEngine *create(TargetMachine *TM);
 };
 
+void EngineBuilder::setUseOrcMCJITReplacement(bool UseOrcMCJITReplacement) {
+  this->UseOrcMCJITReplacement = UseOrcMCJITReplacement;
+}
+
 // Create wrappers for C Binding types (see CBindingWrapping.h).
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ExecutionEngine, LLVMExecutionEngineRef)
 
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
@@ -264,13 +264,26 @@
       std::function<void(VModuleKey K, std::shared_ptr<SymbolResolver> R)>;
 
   /// Construct a compile-on-demand layer instance.
-  LegacyCompileOnDemandLayer(ExecutionSession &ES, BaseLayerT &BaseLayer,
-                             SymbolResolverGetter GetSymbolResolver,
-                             SymbolResolverSetter SetSymbolResolver,
-                             PartitioningFtor Partition,
-                             CompileCallbackMgrT &CallbackMgr,
-                             IndirectStubsManagerBuilderT CreateIndirectStubsManager,
-                             bool CloneStubsIntoPartitions = true)
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyCompileOnDemandLayer(
+          ExecutionSession &ES, BaseLayerT &BaseLayer,
+          SymbolResolverGetter GetSymbolResolver,
+          SymbolResolverSetter SetSymbolResolver, PartitioningFtor Partition,
+          CompileCallbackMgrT &CallbackMgr,
+          IndirectStubsManagerBuilderT CreateIndirectStubsManager,
+          bool CloneStubsIntoPartitions = true),
+      "ORCv1 layers (layers with the 'Legacy' prefix) are deprecated. Please "
+      "use "
+      "the ORCv2 LegacyCompileOnDemandLayer instead");
+
+  /// Legacy layer constructor with deprecation acknowledgement.
+  LegacyCompileOnDemandLayer(
+      ORCv1DeprecationAcknowledgement, ExecutionSession &ES,
+      BaseLayerT &BaseLayer, SymbolResolverGetter GetSymbolResolver,
+      SymbolResolverSetter SetSymbolResolver, PartitioningFtor Partition,
+      CompileCallbackMgrT &CallbackMgr,
+      IndirectStubsManagerBuilderT CreateIndirectStubsManager,
+      bool CloneStubsIntoPartitions = true)
       : ES(ES), BaseLayer(BaseLayer),
         GetSymbolResolver(std::move(GetSymbolResolver)),
         SetSymbolResolver(std::move(SetSymbolResolver)),
@@ -729,8 +742,24 @@
   bool CloneStubsIntoPartitions;
 };
 
-} // end namespace orc
+template <typename BaseLayerT, typename CompileCallbackMgrT,
+          typename IndirectStubsMgrT>
+LegacyCompileOnDemandLayer<BaseLayerT, CompileCallbackMgrT, IndirectStubsMgrT>::
+    LegacyCompileOnDemandLayer(
+        ExecutionSession &ES, BaseLayerT &BaseLayer,
+        SymbolResolverGetter GetSymbolResolver,
+        SymbolResolverSetter SetSymbolResolver, PartitioningFtor Partition,
+        CompileCallbackMgrT &CallbackMgr,
+        IndirectStubsManagerBuilderT CreateIndirectStubsManager,
+        bool CloneStubsIntoPartitions)
+    : ES(ES), BaseLayer(BaseLayer),
+      GetSymbolResolver(std::move(GetSymbolResolver)),
+      SetSymbolResolver(std::move(SetSymbolResolver)),
+      Partition(std::move(Partition)), CompileCallbackMgr(CallbackMgr),
+      CreateIndirectStubsManager(std::move(CreateIndirectStubsManager)),
+      CloneStubsIntoPartitions(CloneStubsIntoPartitions) {}
 
+} // end namespace orc
 } // end namespace llvm
 
 #endif // LLVM_EXECUTIONENGINE_ORC_COMPILEONDEMANDLAYER_H
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/Core.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/Core.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/Core.h
@@ -16,6 +16,7 @@
 #include "llvm/ADT/BitmaskEnum.h"
 #include "llvm/ExecutionEngine/JITSymbol.h"
 #include "llvm/ExecutionEngine/Orc/SymbolStringPool.h"
+#include "llvm/ExecutionEngine/OrcV1Deprecation.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/Debug.h"
 
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/ExecutionUtils.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/ExecutionUtils.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/ExecutionUtils.h
@@ -97,7 +97,14 @@
 public:
   /// Construct a CtorDtorRunner for the given range using the given
   ///        name mangling function.
-  LegacyCtorDtorRunner(std::vector<std::string> CtorDtorNames, VModuleKey K)
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyCtorDtorRunner(std::vector<std::string> CtorDtorNames,
+                           VModuleKey K),
+      "ORCv1 utilities (utilities with the 'Legacy' prefix) are deprecated. "
+      "Please use the ORCv2 CtorDtorRunner utility instead");
+
+  LegacyCtorDtorRunner(ORCv1DeprecationAcknowledgement,
+                       std::vector<std::string> CtorDtorNames, VModuleKey K)
       : CtorDtorNames(std::move(CtorDtorNames)), K(K) {}
 
   /// Run the recorded constructors/destructors through the given JIT
@@ -128,6 +135,11 @@
   orc::VModuleKey K;
 };
 
+template <typename JITLayerT>
+LegacyCtorDtorRunner<JITLayerT>::LegacyCtorDtorRunner(
+    std::vector<std::string> CtorDtorNames, VModuleKey K)
+    : CtorDtorNames(std::move(CtorDtorNames)), K(K) {}
+
 class CtorDtorRunner {
 public:
   CtorDtorRunner(JITDylib &JD) : JD(JD) {}
@@ -180,7 +192,14 @@
 public:
   /// Create a runtime-overrides class.
   template <typename MangleFtorT>
-  LegacyLocalCXXRuntimeOverrides(const MangleFtorT &Mangle) {
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyLocalCXXRuntimeOverrides(const MangleFtorT &Mangle),
+      "ORCv1 utilities (utilities with the 'Legacy' prefix) are deprecated. "
+      "Please use the ORCv2 LocalCXXRuntimeOverrides utility instead");
+
+  template <typename MangleFtorT>
+  LegacyLocalCXXRuntimeOverrides(ORCv1DeprecationAcknowledgement,
+                                 const MangleFtorT &Mangle) {
     addOverride(Mangle("__dso_handle"), toTargetAddress(&DSOHandleOverride));
     addOverride(Mangle("__cxa_atexit"), toTargetAddress(&CXAAtExitOverride));
   }
@@ -201,6 +220,13 @@
   StringMap<JITTargetAddress> CXXRuntimeOverrides;
 };
 
+template <typename MangleFtorT>
+LegacyLocalCXXRuntimeOverrides::LegacyLocalCXXRuntimeOverrides(
+    const MangleFtorT &Mangle) {
+  addOverride(Mangle("__dso_handle"), toTargetAddress(&DSOHandleOverride));
+  addOverride(Mangle("__cxa_atexit"), toTargetAddress(&CXAAtExitOverride));
+}
+
 class LocalCXXRuntimeOverrides : public LocalCXXRuntimeOverridesBase {
 public:
   Error enable(JITDylib &JD, MangleAndInterner &Mangler);
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/IRCompileLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/IRCompileLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/IRCompileLayer.h
@@ -63,8 +63,18 @@
 
   /// Construct an LegacyIRCompileLayer with the given BaseLayer, which must
   ///        implement the ObjectLayer concept.
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyIRCompileLayer(
+          BaseLayerT &BaseLayer, CompileFtor Compile,
+          NotifyCompiledCallback NotifyCompiled = NotifyCompiledCallback()),
+      "ORCv1 layers (layers with the 'Legacy' prefix) are deprecated. Please "
+      "use "
+      "the ORCv2 IRCompileLayer instead");
+
+  /// Legacy layer constructor with deprecation acknowledgement.
   LegacyIRCompileLayer(
-      BaseLayerT &BaseLayer, CompileFtor Compile,
+      ORCv1DeprecationAcknowledgement, BaseLayerT &BaseLayer,
+      CompileFtor Compile,
       NotifyCompiledCallback NotifyCompiled = NotifyCompiledCallback())
       : BaseLayer(BaseLayer), Compile(std::move(Compile)),
         NotifyCompiled(std::move(NotifyCompiled)) {}
@@ -122,8 +132,14 @@
   NotifyCompiledCallback NotifyCompiled;
 };
 
-} // end namespace orc
+template <typename BaseLayerT, typename CompileFtor>
+LegacyIRCompileLayer<BaseLayerT, CompileFtor>::LegacyIRCompileLayer(
+    BaseLayerT &BaseLayer, CompileFtor Compile,
+    NotifyCompiledCallback NotifyCompiled)
+    : BaseLayer(BaseLayer), Compile(std::move(Compile)),
+      NotifyCompiled(std::move(NotifyCompiled)) {}
 
+} // end namespace orc
 } // end namespace llvm
 
 #endif // LLVM_EXECUTIONENGINE_ORC_IRCOMPILINGLAYER_H
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/IRTransformLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/IRTransformLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/IRTransformLayer.h
@@ -56,9 +56,17 @@
 public:
 
   /// Construct an LegacyIRTransformLayer with the given BaseLayer
-  LegacyIRTransformLayer(BaseLayerT &BaseLayer,
-                   TransformFtor Transform = TransformFtor())
-    : BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyIRTransformLayer(BaseLayerT &BaseLayer,
+                             TransformFtor Transform = TransformFtor()),
+      "ORCv1 layers (layers with the 'Legacy' prefix) are deprecated. Please "
+      "use "
+      "the ORCv2 IRTransformLayer instead");
+
+  /// Legacy layer constructor with deprecation acknowledgement.
+  LegacyIRTransformLayer(ORCv1DeprecationAcknowledgement, BaseLayerT &BaseLayer,
+                         TransformFtor Transform = TransformFtor())
+      : BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
 
   /// Apply the transform functor to the module, then add the module to
   ///        the layer below, along with the memory manager and symbol resolver.
@@ -108,6 +116,11 @@
   TransformFtor Transform;
 };
 
+template <typename BaseLayerT, typename TransformFtor>
+LegacyIRTransformLayer<BaseLayerT, TransformFtor>::LegacyIRTransformLayer(
+    BaseLayerT &BaseLayer, TransformFtor Transform)
+    : BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
+
 } // end namespace orc
 } // end namespace llvm
 
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/LambdaResolver.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/LambdaResolver.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/LambdaResolver.h
@@ -24,7 +24,15 @@
 template <typename DylibLookupFtorT, typename ExternalLookupFtorT>
 class LambdaResolver : public LegacyJITSymbolResolver {
 public:
-  LambdaResolver(DylibLookupFtorT DylibLookupFtor,
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LambdaResolver(DylibLookupFtorT DylibLookupFtor,
+                     ExternalLookupFtorT ExternalLookupFtor),
+      "ORCv1 utilities (including resolvers) are deprecated and will be "
+      "removed "
+      "in the next release. Please use ORCv2 (see docs/ORCv2.rst)");
+
+  LambdaResolver(ORCv1DeprecationAcknowledgement,
+                 DylibLookupFtorT DylibLookupFtor,
                  ExternalLookupFtorT ExternalLookupFtor)
       : DylibLookupFtor(DylibLookupFtor),
         ExternalLookupFtor(ExternalLookupFtor) {}
@@ -42,6 +50,12 @@
   ExternalLookupFtorT ExternalLookupFtor;
 };
 
+template <typename DylibLookupFtorT, typename ExternalLookupFtorT>
+LambdaResolver<DylibLookupFtorT, ExternalLookupFtorT>::LambdaResolver(
+    DylibLookupFtorT DylibLookupFtor, ExternalLookupFtorT ExternalLookupFtor)
+    : DylibLookupFtor(DylibLookupFtor), ExternalLookupFtor(ExternalLookupFtor) {
+}
+
 template <typename DylibLookupFtorT,
           typename ExternalLookupFtorT>
 std::shared_ptr<LambdaResolver<DylibLookupFtorT, ExternalLookupFtorT>>
@@ -52,6 +66,17 @@
                          std::move(ExternalLookupFtor));
 }
 
+template <typename DylibLookupFtorT, typename ExternalLookupFtorT>
+std::shared_ptr<LambdaResolver<DylibLookupFtorT, ExternalLookupFtorT>>
+createLambdaResolver(ORCv1DeprecationAcknowledgement,
+                     DylibLookupFtorT DylibLookupFtor,
+                     ExternalLookupFtorT ExternalLookupFtor) {
+  using LR = LambdaResolver<DylibLookupFtorT, ExternalLookupFtorT>;
+  return make_unique<LR>(AcknowledgeORCv1Deprecation,
+                         std::move(DylibLookupFtor),
+                         std::move(ExternalLookupFtor));
+}
+
 } // end namespace orc
 } // end namespace llvm
 
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/LazyEmittingLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/LazyEmittingLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/LazyEmittingLayer.h
@@ -196,7 +196,14 @@
 public:
 
   /// Construct a lazy emitting layer.
-  LazyEmittingLayer(BaseLayerT &BaseLayer) : BaseLayer(BaseLayer) {}
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LazyEmittingLayer(BaseLayerT &BaseLayer),
+      "ORCv1 layers (including LazyEmittingLayer) are deprecated. Please use "
+      "ORCv2, where lazy emission is the default");
+
+  /// Construct a lazy emitting layer.
+  LazyEmittingLayer(ORCv1DeprecationAcknowledgement, BaseLayerT &BaseLayer)
+      : BaseLayer(BaseLayer) {}
 
   /// Add the given module to the lazy emitting layer.
   Error addModule(VModuleKey K, std::unique_ptr<Module> M) {
@@ -254,6 +261,10 @@
   }
 };
 
+template <typename BaseLayerT>
+LazyEmittingLayer<BaseLayerT>::LazyEmittingLayer(BaseLayerT &BaseLayer)
+    : BaseLayer(BaseLayer) {}
+
 } // end namespace orc
 } // end namespace llvm
 
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/ObjectTransformLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/ObjectTransformLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/ObjectTransformLayer.h
@@ -48,7 +48,16 @@
 class LegacyObjectTransformLayer {
 public:
   /// Construct an ObjectTransformLayer with the given BaseLayer
-  LegacyObjectTransformLayer(BaseLayerT &BaseLayer,
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyObjectTransformLayer(BaseLayerT &BaseLayer,
+                                 TransformFtor Transform = TransformFtor()),
+      "ORCv1 layers (layers with the 'Legacy' prefix) are deprecated. Please "
+      "use "
+      "the ORCv2 ObjectTransformLayer instead");
+
+  /// Legacy layer constructor with deprecation acknowledgement.
+  LegacyObjectTransformLayer(ORCv1DeprecationAcknowledgement,
+                             BaseLayerT &BaseLayer,
                              TransformFtor Transform = TransformFtor())
       : BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
 
@@ -107,6 +116,11 @@
   TransformFtor Transform;
 };
 
+template <typename BaseLayerT, typename TransformFtor>
+LegacyObjectTransformLayer<BaseLayerT, TransformFtor>::
+    LegacyObjectTransformLayer(BaseLayerT &BaseLayer, TransformFtor Transform)
+    : BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
+
 } // end namespace orc
 } // end namespace llvm
 
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h
@@ -353,17 +353,27 @@
 
   /// Construct an ObjectLinkingLayer with the given NotifyLoaded,
   ///        and NotifyFinalized functors.
+  LLVM_ATTRIBUTE_DEPRECATED(
+      LegacyRTDyldObjectLinkingLayer(
+          ExecutionSession &ES, ResourcesGetter GetResources,
+          NotifyLoadedFtor NotifyLoaded = NotifyLoadedFtor(),
+          NotifyFinalizedFtor NotifyFinalized = NotifyFinalizedFtor(),
+          NotifyFreedFtor NotifyFreed = NotifyFreedFtor()),
+      "ORCv1 layers (layers with the 'Legacy' prefix) are deprecated. Please "
+      "use "
+      "ORCv2 (see docs/ORCv2.rst)");
+
+  // Legacy layer constructor with deprecation acknowledgement.
   LegacyRTDyldObjectLinkingLayer(
-      ExecutionSession &ES, ResourcesGetter GetResources,
+      ORCv1DeprecationAcknowledgement, ExecutionSession &ES,
+      ResourcesGetter GetResources,
       NotifyLoadedFtor NotifyLoaded = NotifyLoadedFtor(),
       NotifyFinalizedFtor NotifyFinalized = NotifyFinalizedFtor(),
       NotifyFreedFtor NotifyFreed = NotifyFreedFtor())
       : ES(ES), GetResources(std::move(GetResources)),
         NotifyLoaded(std::move(NotifyLoaded)),
         NotifyFinalized(std::move(NotifyFinalized)),
-        NotifyFreed(std::move(NotifyFreed)),
-        ProcessAllSections(false) {
-  }
+        NotifyFreed(std::move(NotifyFreed)), ProcessAllSections(false) {}
 
   /// Set the 'ProcessAllSections' flag.
   ///
Index: llvm/trunk/include/llvm/ExecutionEngine/Orc/RemoteObjectLayer.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/Orc/RemoteObjectLayer.h
+++ llvm/trunk/include/llvm/ExecutionEngine/Orc/RemoteObjectLayer.h
@@ -13,9 +13,10 @@
 #ifndef LLVM_EXECUTIONENGINE_ORC_REMOTEOBJECTLAYER_H
 #define LLVM_EXECUTIONENGINE_ORC_REMOTEOBJECTLAYER_H
 
+#include "llvm/ExecutionEngine/Orc/Core.h"
+#include "llvm/ExecutionEngine/Orc/LambdaResolver.h"
 #include "llvm/ExecutionEngine/Orc/OrcRemoteTargetRPCAPI.h"
 #include "llvm/Object/ObjectFile.h"
-#include "llvm/ExecutionEngine/Orc/LambdaResolver.h"
 #include <map>
 
 namespace llvm {
@@ -312,7 +313,14 @@
   ///
   /// The ReportError functor can be used locally log errors that are intended
   /// to be sent  sent
-  RemoteObjectClientLayer(RPCEndpoint &Remote,
+  LLVM_ATTRIBUTE_DEPRECATED(
+      RemoteObjectClientLayer(RPCEndpoint &Remote,
+                              std::function<void(Error)> ReportError),
+      "ORCv1 layers (including RemoteObjectClientLayer) are deprecated. Please "
+      "use "
+      "ORCv2 (see docs/ORCv2.rst)");
+
+  RemoteObjectClientLayer(ORCv1DeprecationAcknowledgement, RPCEndpoint &Remote,
                           std::function<void(Error)> ReportError)
       : RemoteObjectLayer<RPCEndpoint>(Remote, std::move(ReportError)) {
     using ThisT = RemoteObjectClientLayer<RPCEndpoint>;
@@ -417,11 +425,18 @@
 
   /// Create a RemoteObjectServerLayer with the given base layer (which must be
   /// an object layer), RPC endpoint, and error reporter function.
-  RemoteObjectServerLayer(BaseLayerT &BaseLayer,
-                          RPCEndpoint &Remote,
+  LLVM_ATTRIBUTE_DEPRECATED(
+      RemoteObjectServerLayer(BaseLayerT &BaseLayer, RPCEndpoint &Remote,
+                              std::function<void(Error)> ReportError),
+      "ORCv1 layers (including RemoteObjectServerLayer) are deprecated. Please "
+      "use "
+      "ORCv2 (see docs/ORCv2.rst)");
+
+  RemoteObjectServerLayer(ORCv1DeprecationAcknowledgement,
+                          BaseLayerT &BaseLayer, RPCEndpoint &Remote,
                           std::function<void(Error)> ReportError)
-    : RemoteObjectLayer<RPCEndpoint>(Remote, std::move(ReportError)),
-      BaseLayer(BaseLayer), HandleIdMgr(1) {
+      : RemoteObjectLayer<RPCEndpoint>(Remote, std::move(ReportError)),
+        BaseLayer(BaseLayer), HandleIdMgr(1) {
     using ThisT = RemoteObjectServerLayer<BaseLayerT, RPCEndpoint>;
 
     Remote.template addHandler<AddObject>(*this, &ThisT::addObject);
@@ -462,6 +477,7 @@
     assert(!BaseLayerHandles.count(Id) && "Id already in use?");
 
     auto Resolver = createLambdaResolver(
+        AcknowledgeORCv1Deprecation,
         [this, Id](const std::string &Name) { return lookup(Id, Name); },
         [this, Id](const std::string &Name) {
           return lookupInLogicalDylib(Id, Name);
@@ -522,6 +538,31 @@
   std::map<ObjHandleT, typename BaseLayerT::ObjHandleT> BaseLayerHandles;
 };
 
+template <typename RPCEndpoint>
+RemoteObjectClientLayer<RPCEndpoint>::RemoteObjectClientLayer(
+    RPCEndpoint &Remote, std::function<void(Error)> ReportError)
+    : RemoteObjectLayer<RPCEndpoint>(Remote, std::move(ReportError)) {
+  using ThisT = RemoteObjectClientLayer<RPCEndpoint>;
+  Remote.template addHandler<Lookup>(*this, &ThisT::lookup);
+  Remote.template addHandler<LookupInLogicalDylib>(
+      *this, &ThisT::lookupInLogicalDylib);
+}
+
+template <typename BaseLayerT, typename RPCEndpoint>
+RemoteObjectServerLayer<BaseLayerT, RPCEndpoint>::RemoteObjectServerLayer(
+    BaseLayerT &BaseLayer, RPCEndpoint &Remote,
+    std::function<void(Error)> ReportError)
+    : RemoteObjectLayer<RPCEndpoint>(Remote, std::move(ReportError)),
+      BaseLayer(BaseLayer), HandleIdMgr(1) {
+  using ThisT = RemoteObjectServerLayer<BaseLayerT, RPCEndpoint>;
+
+  Remote.template addHandler<AddObject>(*this, &ThisT::addObject);
+  Remote.template addHandler<RemoveObject>(*this, &ThisT::removeObject);
+  Remote.template addHandler<FindSymbol>(*this, &ThisT::findSymbol);
+  Remote.template addHandler<FindSymbolIn>(*this, &ThisT::findSymbolIn);
+  Remote.template addHandler<EmitAndFinalize>(*this, &ThisT::emitAndFinalize);
+}
+
 } // end namespace orc
 } // end namespace llvm
 
Index: llvm/trunk/include/llvm/ExecutionEngine/OrcV1Deprecation.h
===================================================================
--- llvm/trunk/include/llvm/ExecutionEngine/OrcV1Deprecation.h
+++ llvm/trunk/include/llvm/ExecutionEngine/OrcV1Deprecation.h
@@ -0,0 +1,22 @@
+//===------ OrcV1Deprecation.h - Memory manager for MC-JIT ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Tag for suppressing ORCv1 deprecation warnings.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORCV1DEPRECATION_H
+#define LLVM_EXECUTIONENGINE_ORCV1DEPRECATION_H
+
+namespace llvm {
+
+enum ORCv1DeprecationAcknowledgement { AcknowledgeORCv1Deprecation };
+
+} // namespace llvm
+
+#endif // LLVM_EXECUTIONENGINE_ORCV1DEPRECATION_H
Index: llvm/trunk/lib/ExecutionEngine/Orc/OrcCBindingsStack.h
===================================================================
--- llvm/trunk/lib/ExecutionEngine/Orc/OrcCBindingsStack.h
+++ llvm/trunk/lib/ExecutionEngine/Orc/OrcCBindingsStack.h
@@ -211,28 +211,31 @@
                     IndirectStubsManagerBuilder IndirectStubsMgrBuilder)
       : CCMgr(createCompileCallbackManager(TM, ES)), DL(TM.createDataLayout()),
         IndirectStubsMgr(IndirectStubsMgrBuilder()),
-        ObjectLayer(ES,
-                    [this](orc::VModuleKey K) {
-                      auto ResolverI = Resolvers.find(K);
-                      assert(ResolverI != Resolvers.end() &&
-                             "No resolver for module K");
-                      auto Resolver = std::move(ResolverI->second);
-                      Resolvers.erase(ResolverI);
-                      return ObjLayerT::Resources{
-                          std::make_shared<SectionMemoryManager>(), Resolver};
-                    },
-                    nullptr,
-                    [this](orc::VModuleKey K, const object::ObjectFile &Obj,
-                           const RuntimeDyld::LoadedObjectInfo &LoadedObjInfo) {
-		      this->notifyFinalized(K, Obj, LoadedObjInfo);
-                    },
-                    [this](orc::VModuleKey K, const object::ObjectFile &Obj) {
-		      this->notifyFreed(K, Obj);
-                    }),
-        CompileLayer(ObjectLayer, orc::SimpleCompiler(TM)),
+        ObjectLayer(
+            AcknowledgeORCv1Deprecation, ES,
+            [this](orc::VModuleKey K) {
+              auto ResolverI = Resolvers.find(K);
+              assert(ResolverI != Resolvers.end() &&
+                     "No resolver for module K");
+              auto Resolver = std::move(ResolverI->second);
+              Resolvers.erase(ResolverI);
+              return ObjLayerT::Resources{
+                  std::make_shared<SectionMemoryManager>(), Resolver};
+            },
+            nullptr,
+            [this](orc::VModuleKey K, const object::ObjectFile &Obj,
+                   const RuntimeDyld::LoadedObjectInfo &LoadedObjInfo) {
+              this->notifyFinalized(K, Obj, LoadedObjInfo);
+            },
+            [this](orc::VModuleKey K, const object::ObjectFile &Obj) {
+              this->notifyFreed(K, Obj);
+            }),
+        CompileLayer(AcknowledgeORCv1Deprecation, ObjectLayer,
+                     orc::SimpleCompiler(TM)),
         CODLayer(createCODLayer(ES, CompileLayer, CCMgr.get(),
                                 std::move(IndirectStubsMgrBuilder), Resolvers)),
         CXXRuntimeOverrides(
+            AcknowledgeORCv1Deprecation,
             [this](const std::string &S) { return mangle(S); }) {}
 
   Error shutdown() {
@@ -308,7 +311,8 @@
 
     // Run the static constructors, and save the static destructor runner for
     // execution when the JIT is torn down.
-    orc::LegacyCtorDtorRunner<OrcCBindingsStack> CtorRunner(std::move(CtorNames), K);
+    orc::LegacyCtorDtorRunner<OrcCBindingsStack> CtorRunner(
+        AcknowledgeORCv1Deprecation, std::move(CtorNames), K);
     if (auto Err = CtorRunner.runViaLayer(*this))
       return std::move(Err);
 
@@ -465,7 +469,7 @@
       return nullptr;
 
     return llvm::make_unique<CODLayerT>(
-        ES, CompileLayer,
+        AcknowledgeORCv1Deprecation, ES, CompileLayer,
         [&Resolvers](orc::VModuleKey K) {
           auto ResolverI = Resolvers.find(K);
           assert(ResolverI != Resolvers.end() && "No resolver for module K");
Index: llvm/trunk/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
===================================================================
--- llvm/trunk/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
+++ llvm/trunk/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
@@ -232,24 +232,24 @@
   OrcMCJITReplacement(std::shared_ptr<MCJITMemoryManager> MemMgr,
                       std::shared_ptr<LegacyJITSymbolResolver> ClientResolver,
                       std::unique_ptr<TargetMachine> TM)
-      : ExecutionEngine(TM->createDataLayout()),
-        TM(std::move(TM)),
+      : ExecutionEngine(TM->createDataLayout()), TM(std::move(TM)),
         MemMgr(
             std::make_shared<MCJITReplacementMemMgr>(*this, std::move(MemMgr))),
         Resolver(std::make_shared<LinkingORCResolver>(*this)),
         ClientResolver(std::move(ClientResolver)), NotifyObjectLoaded(*this),
         NotifyFinalized(*this),
         ObjectLayer(
-            ES,
+            AcknowledgeORCv1Deprecation, ES,
             [this](VModuleKey K) {
               return ObjectLayerT::Resources{this->MemMgr, this->Resolver};
             },
             NotifyObjectLoaded, NotifyFinalized),
-        CompileLayer(ObjectLayer, SimpleCompiler(*this->TM),
+        CompileLayer(AcknowledgeORCv1Deprecation, ObjectLayer,
+                     SimpleCompiler(*this->TM),
                      [this](VModuleKey K, std::unique_ptr<Module> M) {
                        Modules.push_back(std::move(M));
                      }),
-        LazyEmitLayer(CompileLayer) {}
+        LazyEmitLayer(AcknowledgeORCv1Deprecation, CompileLayer) {}
 
   static void Register() {
     OrcMCJITReplacementCtor = createOrcMCJITReplacement;
Index: llvm/trunk/lib/ExecutionEngine/Orc/OrcMCJITReplacement.cpp
===================================================================
--- llvm/trunk/lib/ExecutionEngine/Orc/OrcMCJITReplacement.cpp
+++ llvm/trunk/lib/ExecutionEngine/Orc/OrcMCJITReplacement.cpp
@@ -127,7 +127,8 @@
   auto &CtorDtorsMap = isDtors ? UnexecutedDestructors : UnexecutedConstructors;
 
   for (auto &KV : CtorDtorsMap)
-    cantFail(LegacyCtorDtorRunner<LazyEmitLayerT>(std::move(KV.second), KV.first)
+    cantFail(LegacyCtorDtorRunner<LazyEmitLayerT>(
+                 AcknowledgeORCv1Deprecation, std::move(KV.second), KV.first)
                  .runViaLayer(LazyEmitLayer));
 
   CtorDtorsMap.clear();
Index: llvm/trunk/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp
===================================================================
--- llvm/trunk/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp
+++ llvm/trunk/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp
@@ -207,5 +207,14 @@
     NotifyEmitted(K, std::move(ObjBuffer));
 }
 
+LegacyRTDyldObjectLinkingLayer::LegacyRTDyldObjectLinkingLayer(
+    ExecutionSession &ES, ResourcesGetter GetResources,
+    NotifyLoadedFtor NotifyLoaded, NotifyFinalizedFtor NotifyFinalized,
+    NotifyFreedFtor NotifyFreed)
+    : ES(ES), GetResources(std::move(GetResources)),
+      NotifyLoaded(std::move(NotifyLoaded)),
+      NotifyFinalized(std::move(NotifyFinalized)),
+      NotifyFreed(std::move(NotifyFreed)), ProcessAllSections(false) {}
+
 } // End namespace orc.
 } // End namespace llvm.
Index: llvm/trunk/tools/lli/lli.cpp
===================================================================
--- llvm/trunk/tools/lli/lli.cpp
+++ llvm/trunk/tools/lli/lli.cpp
@@ -83,18 +83,15 @@
                                  cl::desc("Force interpretation: disable JIT"),
                                  cl::init(false));
 
-  cl::opt<JITKind> UseJITKind("jit-kind",
-                              cl::desc("Choose underlying JIT kind."),
-                              cl::init(JITKind::MCJIT),
-                              cl::values(
-                                clEnumValN(JITKind::MCJIT, "mcjit",
-                                           "MCJIT"),
-                                clEnumValN(JITKind::OrcMCJITReplacement,
-                                           "orc-mcjit",
-                                           "Orc-based MCJIT replacement"),
-                                clEnumValN(JITKind::OrcLazy,
-                                           "orc-lazy",
-                                           "Orc-based lazy JIT.")));
+  cl::opt<JITKind> UseJITKind(
+      "jit-kind", cl::desc("Choose underlying JIT kind."),
+      cl::init(JITKind::MCJIT),
+      cl::values(clEnumValN(JITKind::MCJIT, "mcjit", "MCJIT"),
+                 clEnumValN(JITKind::OrcMCJITReplacement, "orc-mcjit",
+                            "Orc-based MCJIT replacement "
+                            "(deprecated)"),
+                 clEnumValN(JITKind::OrcLazy, "orc-lazy",
+                            "Orc-based lazy JIT.")));
 
   cl::opt<unsigned>
   LazyJITCompileThreads("compile-threads",
@@ -419,7 +416,8 @@
   builder.setEngineKind(ForceInterpreter
                         ? EngineKind::Interpreter
                         : EngineKind::JIT);
-  builder.setUseOrcMCJITReplacement(UseJITKind == JITKind::OrcMCJITReplacement);
+  builder.setUseOrcMCJITReplacement(AcknowledgeORCv1Deprecation,
+                                    UseJITKind == JITKind::OrcMCJITReplacement);
 
   // If we are supposed to override the target triple, do so now.
   if (!TargetTriple.empty())
@@ -665,6 +663,7 @@
     // Forward MCJIT's symbol resolution calls to the remote.
     static_cast<ForwardingMemoryManager *>(RTDyldMM)->setResolver(
         orc::createLambdaResolver(
+            AcknowledgeORCv1Deprecation,
             [](const std::string &Name) { return nullptr; },
             [&](const std::string &Name) {
               if (auto Addr = ExitOnErr(R->getSymbolAddress(Name)))
Index: llvm/trunk/unittests/ExecutionEngine/Orc/LazyEmittingLayerTest.cpp
===================================================================
--- llvm/trunk/unittests/ExecutionEngine/Orc/LazyEmittingLayerTest.cpp
+++ llvm/trunk/unittests/ExecutionEngine/Orc/LazyEmittingLayerTest.cpp
@@ -22,7 +22,8 @@
 
 TEST(LazyEmittingLayerTest, Empty) {
   MockBaseLayer M;
-  llvm::orc::LazyEmittingLayer<MockBaseLayer> L(M);
+  llvm::orc::LazyEmittingLayer<MockBaseLayer> L(
+      llvm::AcknowledgeORCv1Deprecation, M);
   cantFail(
       L.addModule(llvm::orc::VModuleKey(), std::unique_ptr<llvm::Module>()));
 }
Index: llvm/trunk/unittests/ExecutionEngine/Orc/LegacyCompileOnDemandLayerTest.cpp
===================================================================
--- llvm/trunk/unittests/ExecutionEngine/Orc/LegacyCompileOnDemandLayerTest.cpp
+++ llvm/trunk/unittests/ExecutionEngine/Orc/LegacyCompileOnDemandLayerTest.cpp
@@ -76,7 +76,7 @@
   };
 
   llvm::orc::LegacyCompileOnDemandLayer<decltype(TestBaseLayer)> COD(
-      ES, TestBaseLayer, GetResolver, SetResolver,
+      AcknowledgeORCv1Deprecation, ES, TestBaseLayer, GetResolver, SetResolver,
       [](Function &F) { return std::set<Function *>{&F}; }, CallbackMgr,
       [] { return llvm::make_unique<DummyStubsManager>(); }, true);
 
Index: llvm/trunk/unittests/ExecutionEngine/Orc/LegacyRTDyldObjectLinkingLayerTest.cpp
===================================================================
--- llvm/trunk/unittests/ExecutionEngine/Orc/LegacyRTDyldObjectLinkingLayerTest.cpp
+++ llvm/trunk/unittests/ExecutionEngine/Orc/LegacyRTDyldObjectLinkingLayerTest.cpp
@@ -68,10 +68,11 @@
 
   ExecutionSession ES;
 
-  LegacyRTDyldObjectLinkingLayer ObjLayer(ES, [&MM](VModuleKey) {
-    return LegacyRTDyldObjectLinkingLayer::Resources{
-        MM, std::make_shared<NullResolver>()};
-  });
+  LegacyRTDyldObjectLinkingLayer ObjLayer(
+      AcknowledgeORCv1Deprecation, ES, [&MM](VModuleKey) {
+        return LegacyRTDyldObjectLinkingLayer::Resources{
+            MM, std::make_shared<NullResolver>()};
+      });
 
   LLVMContext Context;
   auto M = llvm::make_unique<Module>("", Context);
@@ -130,13 +131,14 @@
 
   std::map<orc::VModuleKey, std::shared_ptr<orc::SymbolResolver>> Resolvers;
 
-  LegacyRTDyldObjectLinkingLayer ObjLayer(ES, [&](VModuleKey K) {
-    auto I = Resolvers.find(K);
-    assert(I != Resolvers.end() && "Missing resolver");
-    auto R = std::move(I->second);
-    Resolvers.erase(I);
-    return LegacyRTDyldObjectLinkingLayer::Resources{MM, std::move(R)};
-  });
+  LegacyRTDyldObjectLinkingLayer ObjLayer(
+      AcknowledgeORCv1Deprecation, ES, [&](VModuleKey K) {
+        auto I = Resolvers.find(K);
+        assert(I != Resolvers.end() && "Missing resolver");
+        auto R = std::move(I->second);
+        Resolvers.erase(I);
+        return LegacyRTDyldObjectLinkingLayer::Resources{MM, std::move(R)};
+      });
   SimpleCompiler Compile(*TM);
 
   // Create a pair of modules that will trigger recursive finalization:
@@ -217,10 +219,11 @@
 
   auto MM = std::make_shared<SectionMemoryManagerWrapper>();
 
-  LegacyRTDyldObjectLinkingLayer ObjLayer(ES, [&MM](VModuleKey K) {
-    return LegacyRTDyldObjectLinkingLayer::Resources{
-        MM, std::make_shared<NullResolver>()};
-  });
+  LegacyRTDyldObjectLinkingLayer ObjLayer(
+      AcknowledgeORCv1Deprecation, ES, [&MM](VModuleKey K) {
+        return LegacyRTDyldObjectLinkingLayer::Resources{
+            MM, std::make_shared<NullResolver>()};
+      });
   SimpleCompiler Compile(*TM);
 
   // Create a pair of unrelated modules:
@@ -278,7 +281,7 @@
 TEST_F(LegacyRTDyldObjectLinkingLayerExecutionTest, TestNotifyLoadedSignature) {
   ExecutionSession ES;
   LegacyRTDyldObjectLinkingLayer ObjLayer(
-      ES,
+      AcknowledgeORCv1Deprecation, ES,
       [](VModuleKey) {
         return LegacyRTDyldObjectLinkingLayer::Resources{
             nullptr, std::make_shared<NullResolver>()};
Index: llvm/trunk/unittests/ExecutionEngine/Orc/ObjectTransformLayerTest.cpp
===================================================================
--- llvm/trunk/unittests/ExecutionEngine/Orc/ObjectTransformLayerTest.cpp
+++ llvm/trunk/unittests/ExecutionEngine/Orc/ObjectTransformLayerTest.cpp
@@ -182,17 +182,19 @@
 
   // Create one object transform layer using a transform (as a functor)
   // that allocates new objects, and deals in unique pointers.
-  LegacyObjectTransformLayer<MockBaseLayer, AllocatingTransform> T1(M);
+  LegacyObjectTransformLayer<MockBaseLayer, AllocatingTransform> T1(
+      llvm::AcknowledgeORCv1Deprecation, M);
 
   // Create a second object transform layer using a transform (as a lambda)
   // that mutates objects in place, and deals in naked pointers
   LegacyObjectTransformLayer<MockBaseLayer,
-                         std::function<std::shared_ptr<MockObjectFile>(
-                           std::shared_ptr<MockObjectFile>)>>
-    T2(M, [](std::shared_ptr<MockObjectFile> Obj) {
-    ++(*Obj);
-    return Obj;
-  });
+                             std::function<std::shared_ptr<MockObjectFile>(
+                                 std::shared_ptr<MockObjectFile>)>>
+      T2(llvm::AcknowledgeORCv1Deprecation, M,
+         [](std::shared_ptr<MockObjectFile> Obj) {
+           ++(*Obj);
+           return Obj;
+         });
 
   // Test addObject with T1 (allocating)
   auto K1 = ES.allocateVModule();
@@ -281,22 +283,25 @@
   };
 
   // Construct the jit layers.
-  LegacyRTDyldObjectLinkingLayer BaseLayer(ES, [](VModuleKey) {
-    return LegacyRTDyldObjectLinkingLayer::Resources{
-        std::make_shared<llvm::SectionMemoryManager>(),
-        std::make_shared<NullResolver>()};
-  });
+  LegacyRTDyldObjectLinkingLayer BaseLayer(
+      llvm::AcknowledgeORCv1Deprecation, ES, [](VModuleKey) {
+        return LegacyRTDyldObjectLinkingLayer::Resources{
+            std::make_shared<llvm::SectionMemoryManager>(),
+            std::make_shared<NullResolver>()};
+      });
 
   auto IdentityTransform = [](std::unique_ptr<llvm::MemoryBuffer> Obj) {
     return Obj;
   };
   LegacyObjectTransformLayer<decltype(BaseLayer), decltype(IdentityTransform)>
-      TransformLayer(BaseLayer, IdentityTransform);
+      TransformLayer(llvm::AcknowledgeORCv1Deprecation, BaseLayer,
+                     IdentityTransform);
   auto NullCompiler = [](llvm::Module &) {
     return std::unique_ptr<llvm::MemoryBuffer>(nullptr);
   };
   LegacyIRCompileLayer<decltype(TransformLayer), decltype(NullCompiler)>
-    CompileLayer(TransformLayer, NullCompiler);
+      CompileLayer(llvm::AcknowledgeORCv1Deprecation, TransformLayer,
+                   NullCompiler);
 
   // Make sure that the calls from LegacyIRCompileLayer to LegacyObjectTransformLayer
   // compile.
Index: llvm/trunk/unittests/ExecutionEngine/Orc/RemoteObjectLayerTest.cpp
===================================================================
--- llvm/trunk/unittests/ExecutionEngine/Orc/RemoteObjectLayerTest.cpp
+++ llvm/trunk/unittests/ExecutionEngine/Orc/RemoteObjectLayerTest.cpp
@@ -127,7 +127,8 @@
   std::copy(ObjBytes.begin(), ObjBytes.end(), ObjContents.begin());
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
   MockObjectLayer BaseLayer(
@@ -144,9 +145,8 @@
 
       return 1;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -181,7 +181,8 @@
     };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
   MockObjectLayer BaseLayer(
@@ -191,9 +192,8 @@
       return make_error<StringError>("AddObjectFailure - Test Message",
                                      inconvertibleErrorCode());
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -233,7 +233,8 @@
   };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
 
@@ -243,9 +244,8 @@
       SymTab[1] = MockObjectLayer::LookupFn();
       return 1;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -283,7 +283,8 @@
     };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
 
@@ -294,9 +295,8 @@
        MockObjectLayer::SymbolLookupTable &SymTab) {
       return 42;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -339,7 +339,8 @@
     };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
 
@@ -358,9 +359,8 @@
         };
       return 42;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -421,7 +421,8 @@
     };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
 
@@ -447,9 +448,8 @@
 
       return 42;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -496,7 +496,8 @@
   };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
 
@@ -506,9 +507,8 @@
       SymTab[1] = MockObjectLayer::LookupFn();
       return 1;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(
@@ -547,7 +547,8 @@
     };
 
   RPCEndpoint ClientEP(*Channels.first, true);
-  RemoteObjectClientLayer<RPCEndpoint> Client(ClientEP, ReportError);
+  RemoteObjectClientLayer<RPCEndpoint> Client(AcknowledgeORCv1Deprecation,
+                                              ClientEP, ReportError);
 
   RPCEndpoint ServerEP(*Channels.second, true);
 
@@ -556,9 +557,8 @@
        MockObjectLayer::SymbolLookupTable &SymTab) {
       return 1;
     });
-  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(BaseLayer,
-                                                               ServerEP,
-                                                               ReportError);
+  RemoteObjectServerLayer<MockObjectLayer, RPCEndpoint> Server(
+      AcknowledgeORCv1Deprecation, BaseLayer, ServerEP, ReportError);
 
   bool Finished = false;
   ServerEP.addHandler<remote::utils::TerminateSession>(