Add cuda compile define and cmake setting

src/CudaMatrix.cpp

@@ -1,3 +1,4 @@
+#ifdef USE_CUDA
 #include "CudaMatrix.h"
 
 #include "Function.h"
@@ -218,6 +219,7 @@ CudaMatrix CudaMatrix::block(int aDim,int aBeginIndex, int aEndIndex) const
             return CudaMatrix::fromRawData(dataOutput,getDimSize(0),dimLength,getDimSize(2),getValueType());
         }
         case 2:
+        default:
         {
             int copySize = dimLength*sliceStride;
             cudaMemcpy(dataOutput, 
@@ -235,4 +237,6 @@ bool CudaMatrix::setBlockValue(int aDim,int aBeginIndx, int aEndIndex,float valu
         std::cerr<<"CudaMatrix block only support 1D-3D data!"<<std::endl;
         return false;
     }
-}
+    return true;
+}
+#endif // USE_CUDA