[CUDA] Make CUDA compilation usable by default.

Currently clang requires several additional command
line options in order to enable new features needed
during CUDA compilation. This patch makes these
options default.

* Automatically include cuda_runtime.h if we've found
  a valid CUDA installation.
* Disable automatic CUDA header inclusion during unit tests.
* Added test case for command line construction.
* Enabled target overloads and relaxed call checks that are
  needed in order to include CUDA headers.
* Added CUDA-7.5 installation path to the CUDA installation search list.
* Define __CUDA__ macro to indicate CUDA compilation.

llvm-svn: 253389

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 531e7900b11..78a611e56d4 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -1629,6 +1629,7 @@ void Generic_GCC::CudaInstallationDetector::init(
         Args.getLastArgValue(options::OPT_cuda_path_EQ));
   else {
     CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda");
+    CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda-7.5");
     CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda-7.0");
   }
 
@@ -4134,8 +4135,11 @@ void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs,
   if (DriverArgs.hasArg(options::OPT_nocudainc))
     return;
 
-  if (CudaInstallation.isValid())
+  if (CudaInstallation.isValid()) {
     addSystemInclude(DriverArgs, CC1Args, CudaInstallation.getIncludePath());
+    CC1Args.push_back("-include");
+    CC1Args.push_back("cuda_runtime.h");
+  }
 }
 
 bool Linux::isPIEDefault() const { return getSanitizerArgs().requiresPIE(); }