Merge fixes from trunk. Prevent CUDA dll mismatches.

src/nvtt/cuda/CudaUtils.cpp

@@ -22,6 +22,7 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 
 #include <nvcore/Debug.h>
+#include <nvcore/Library.h>
 #include "CudaUtils.h"
 
 #if defined HAVE_CUDA
@@ -69,6 +70,35 @@ static bool isWow32()
 #endif
 
 
+static bool isCudaDriverAvailable(uint version)
+{
+#if NV_OS_WIN32
+	Library nvcuda("nvcuda.dll");
+#else
+	Library nvcuda(NV_LIBRARY_NAME("cuda"));
+#endif
+	
+	if (!nvcuda.isValid())
+	{
+		return false;
+	}
+	
+	if (version > 2000)
+	{
+		void * address = nvcuda.bindSymbol("cuStreamCreate");
+		if (address == NULL) return false;
+	}
+
+	if (version > 2010)
+	{
+		void * address = nvcuda.bindSymbol("cuLoadDataEx");
+		if (address == NULL) return false;
+	}
+	
+	return true;
+}
+
+
 /// Determine if CUDA is available.
 bool nv::cuda::isHardwarePresent()
 {
@@ -90,6 +120,12 @@ bool nv::cuda::isHardwarePresent()
 			return false;
 		}
 
+		// Make sure that CUDA driver matches CUDA runtime.
+		if (!isCudaDriverAvailable(CUDART_VERSION))
+		{
+			return false;
+		}
+
 		// @@ Make sure that warp size == 32
 	}