[CUDA] Raise an error if the CUDA install can't be found.

Summary:
Without this change, we silently proceed on without including
__clang_cuda_runtime_wrapper.h.  This leads to very strange behavior --
you say you're compiling CUDA code, but e.g. __device__ is not defined!

Reviewers: tra

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D19180

llvm-svn: 266496

1 files changed, 7 insertions, 4 deletions

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 902338b2884..8420fd8fbd6 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -4118,11 +4118,14 @@ void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs,
   if (DriverArgs.hasArg(options::OPT_nocudainc))
     return;
 
-  if (CudaInstallation.isValid()) {
-    addSystemInclude(DriverArgs, CC1Args, CudaInstallation.getIncludePath());
-    CC1Args.push_back("-include");
-    CC1Args.push_back("__clang_cuda_runtime_wrapper.h");
+  if (!CudaInstallation.isValid()) {
+    getDriver().Diag(diag::err_drv_no_cuda_installation);
+    return;
   }
+
+  addSystemInclude(DriverArgs, CC1Args, CudaInstallation.getIncludePath());
+  CC1Args.push_back("-include");
+  CC1Args.push_back("__clang_cuda_runtime_wrapper.h");
 }
 
 bool Linux::isPIEDefault() const { return getSanitizerArgs().requiresPIE(); }