Dynamic CUDA support library loading implemented for Linux.

Logical mistake in macro fixed;
DeviceInfo deligate reimplemented;
Build and warning fixes.

modules/core/cuda/CMakeLists.txt

@@ -1,6 +1,5 @@
 project(opencv_core_cuda)
-set(HAVE_CUDA FALSE)
-add_definitions("-DHAVE_CUDA")
+add_definitions(-DUSE_CUDA)
 include_directories(${CUDA_INCLUDE_DIRS}
                     "../src/"
                     "../include/opencv2/core/"

modules/core/cuda/main.cpp

@@ -1,6 +1,10 @@
+#include "cvconfig.h"
 #include "opencv2/core/core.hpp"
 #include "opencv2/core/gpumat.hpp"
 
+#include <stdio.h>
+#include <iostream>
+
 #ifdef HAVE_CUDA
 #include <cuda_runtime.h>
 #include <npp.h>
@@ -17,7 +21,30 @@
 #endif
 #endif
 
+using namespace std;
 using namespace cv;
 using namespace cv::gpu;
 
-#include "gpumat_cuda.hpp"
+#include "gpumat_cuda.hpp"
+
+#ifdef HAVE_CUDA
+static CudaDeviceInfoFuncTable deviceInfoTable;
+static CudaFuncTable gpuTable;
+#else
+static EmptyDeviceInfoFuncTable deviceInfoTable;
+static EmptyFuncTable gpuTable;
+#endif
+
+extern "C" {
+   
+DeviceInfoFuncTable* deviceInfoFactory()
+{
+    return (DeviceInfoFuncTable*)&deviceInfoTable;
+}
+
+GpuFuncTable* gpuFactory()
+{
+    return (GpuFuncTable*)&gpuTable;
+}
+
+}