Index: cfe/trunk/include/clang/Basic/Cuda.h
===================================================================
--- cfe/trunk/include/clang/Basic/Cuda.h
+++ cfe/trunk/include/clang/Basic/Cuda.h
@@ -46,6 +46,7 @@
   SM_62,
   SM_70,
   SM_72,
+  LAST,
 };
 const char *CudaArchToString(CudaArch A);
 
Index: cfe/trunk/lib/Basic/Cuda.cpp
===================================================================
--- cfe/trunk/lib/Basic/Cuda.cpp
+++ cfe/trunk/lib/Basic/Cuda.cpp
@@ -26,6 +26,8 @@
 
 const char *CudaArchToString(CudaArch A) {
   switch (A) {
+  case CudaArch::LAST:
+    break;
   case CudaArch::UNKNOWN:
     return "unknown";
   case CudaArch::SM_20:
@@ -133,6 +135,8 @@
 
 CudaVirtualArch VirtualArchForCudaArch(CudaArch A) {
   switch (A) {
+  case CudaArch::LAST:
+    break;
   case CudaArch::UNKNOWN:
     return CudaVirtualArch::UNKNOWN;
   case CudaArch::SM_20:
@@ -168,6 +172,8 @@
 
 CudaVersion MinVersionForCudaArch(CudaArch A) {
   switch (A) {
+  case CudaArch::LAST:
+    break;
   case CudaArch::UNKNOWN:
     return CudaVersion::UNKNOWN;
   case CudaArch::SM_20:
Index: cfe/trunk/lib/Basic/Targets/NVPTX.h
===================================================================
--- cfe/trunk/lib/Basic/Targets/NVPTX.h
+++ cfe/trunk/lib/Basic/Targets/NVPTX.h
@@ -98,6 +98,12 @@
     return StringToCudaArch(Name) != CudaArch::UNKNOWN;
   }
 
+  void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override {
+    for (int i = static_cast<int>(CudaArch::SM_20);
+         i < static_cast<int>(CudaArch::LAST); ++i)
+      Values.emplace_back(CudaArchToString(static_cast<CudaArch>(i)));
+  }
+
   bool setCPU(const std::string &Name) override {
     GPU = StringToCudaArch(Name);
     return GPU != CudaArch::UNKNOWN;
Index: cfe/trunk/lib/Basic/Targets/NVPTX.cpp
===================================================================
--- cfe/trunk/lib/Basic/Targets/NVPTX.cpp
+++ cfe/trunk/lib/Basic/Targets/NVPTX.cpp
@@ -157,6 +157,8 @@
     // Set __CUDA_ARCH__ for the GPU specified.
     std::string CUDAArchCode = [this] {
       switch (GPU) {
+      case CudaArch::LAST:
+        break;
       case CudaArch::UNKNOWN:
         assert(false && "No GPU arch when compiling CUDA device code.");
         return "";