fixed #2297, #2300; fixed several warnings

modules/core/src/array.cpp

@@ -861,7 +861,7 @@ cvCreateData( CvArr* arr )
         if( CV_IS_MAT_CONT( mat->type ))
         {
             total_size = (size_t)mat->dim[0].size*(mat->dim[0].step != 0 ?
-                         mat->dim[0].step : total_size);
+                         (size_t)mat->dim[0].step : total_size);
         }
         else
         {

modules/core/src/cmdparser.cpp

@@ -7,7 +7,8 @@ using namespace std;
 using namespace cv;
 
 namespace {
-void helpParser()
+#if 0
+static void helpParser()
 {
     printf("\nThe CommandLineParser class is designed for command line arguments parsing\n"
            "Keys map: \n"
@@ -50,6 +51,7 @@ void helpParser()
            "                          It also works with 'unsigned int', 'double', and 'float' types \n"
            );
 }
+#endif
 
 vector<string> split_string(const string& str, const string& delimiters)
 {

modules/core/src/opengl_interop.cpp

@@ -113,13 +113,13 @@ namespace
 
     const CvOpenGlFuncTab* g_glFuncTab = 0;
 
-//#ifdef HAVE_CUDA
+#if defined HAVE_CUDA || defined HAVE_OPENGL
     const CvOpenGlFuncTab* glFuncTab()
     {
         static EmptyGlFuncTab empty;
         return g_glFuncTab ? g_glFuncTab : ∅
     }
-//#endif
+#endif
 }
 
 CvOpenGlFuncTab::~CvOpenGlFuncTab()

modules/core/src/persistence.cpp

@@ -2793,7 +2793,7 @@ cvOpenFileStorage( const char* filename, CvMemStorage* dststorage, int flags, co
         fs->buffer_end = fs->buffer_start + buf_size;
         if( fs->fmt == CV_STORAGE_FORMAT_XML )
         {
-            size_t file_size = fs->file ? ftell( fs->file ) : (size_t)0;
+            size_t file_size = fs->file ? (size_t)ftell( fs->file ) : (size_t)0;
             fs->strstorage = cvCreateChildMemStorage( fs->memstorage );
             if( !append || file_size == 0 )
             {