jlebar added inline comments.

================
Comment at: lib/Driver/ToolChains.cpp:4773
@@ +4772,3 @@
+  StringRef GpuArch =
+      DriverArgs.getLastArgValue(options::OPT_march_EQ, "sm_20");
+  std::string LibDeviceFile = CudaInstallation.getLibDeviceFile(GpuArch);
----------------
I *think* march is never empty here.  We should add it when we create the 
CudaActions.

Same below.

If I'm right or if I'm wrong, let's make sure there are tests.  :)

================
Comment at: test/Driver/cuda-detect.cu:66
@@ -63,2 +65,2 @@
 // NOCUDAINC-NOT: "-include" "__clang_cuda_runtime_wrapper.h"
 // COMMON-SAME: "-x" "cuda"
----------------
Should we test the new sm_XX --> libdevice file mappings added?


https://reviews.llvm.org/D23037



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