From 8d75d8dc72a0ac4502991891782a2c84df1f61c3 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 14 Feb 2017 10:32:44 -0500
Subject: Tests: Add case for CUDA with C but not C++

An executable using CUDA and C should link as CUDA.
---
 Tests/Cuda/CMakeLists.txt       |  1 +
 Tests/Cuda/WithC/CMakeLists.txt | 12 ++++++++++++
 Tests/Cuda/WithC/cuda.cu        | 16 ++++++++++++++++
 Tests/Cuda/WithC/main.c         |  6 ++++++
 4 files changed, 35 insertions(+)
 create mode 100644 Tests/Cuda/WithC/CMakeLists.txt
 create mode 100644 Tests/Cuda/WithC/cuda.cu
 create mode 100644 Tests/Cuda/WithC/main.c

diff --git a/Tests/Cuda/CMakeLists.txt b/Tests/Cuda/CMakeLists.txt
index 42b00e1..de48501 100644
--- a/Tests/Cuda/CMakeLists.txt
+++ b/Tests/Cuda/CMakeLists.txt
@@ -4,3 +4,4 @@ ADD_TEST_MACRO(Cuda.ConsumeCompileFeatures CudaConsumeCompileFeatures)
 ADD_TEST_MACRO(Cuda.ObjectLibrary CudaObjectLibrary)
 ADD_TEST_MACRO(Cuda.ToolkitInclude CudaToolkitInclude)
 ADD_TEST_MACRO(Cuda.ProperLinkFlags ProperLinkFlags)
+ADD_TEST_MACRO(Cuda.WithC CudaWithC)
diff --git a/Tests/Cuda/WithC/CMakeLists.txt b/Tests/Cuda/WithC/CMakeLists.txt
new file mode 100644
index 0000000..7596804
--- /dev/null
+++ b/Tests/Cuda/WithC/CMakeLists.txt
@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.7)
+project(CudaComplex CUDA C)
+
+set(CMAKE_CUDA_FLAGS "-gencode arch=compute_30,code=compute_30")
+
+add_executable(CudaWithC main.c cuda.cu)
+
+if(APPLE)
+  # We need to add the default path to the driver (libcuda.dylib) as an rpath, so that
+  # the static cuda runtime can find it at runtime.
+  target_link_libraries(CudaWithC PRIVATE -Wl,-rpath,/usr/local/cuda/lib)
+endif()
diff --git a/Tests/Cuda/WithC/cuda.cu b/Tests/Cuda/WithC/cuda.cu
new file mode 100644
index 0000000..06bd7b9
--- /dev/null
+++ b/Tests/Cuda/WithC/cuda.cu
@@ -0,0 +1,16 @@
+#include <cuda.h>
+
+#include <iostream>
+
+extern "C" int use_cuda(void)
+{
+  int nDevices = 0;
+  cudaError_t err = cudaGetDeviceCount(&nDevices);
+  if (err != cudaSuccess) {
+    std::cerr << "Failed to retrieve the number of CUDA enabled devices"
+              << std::endl;
+    return 1;
+  }
+  std::cout << "Found " << nDevices << " CUDA enabled devices" << std::endl;
+  return 0;
+}
diff --git a/Tests/Cuda/WithC/main.c b/Tests/Cuda/WithC/main.c
new file mode 100644
index 0000000..f9101a7
--- /dev/null
+++ b/Tests/Cuda/WithC/main.c
@@ -0,0 +1,6 @@
+extern int use_cuda(void);
+
+int main()
+{
+  return use_cuda();
+}
-- 
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