fixed many warnings from GCC 4.6.1

modules/core/src/dxt.cpp

@@ -1475,9 +1475,9 @@ void cv::dft( InputArray _src0, OutputArray _dst, int flags, int nonzero_rows )
     int elem_size = (int)src.elemSize1(), complex_elem_size = elem_size*2;
     int factors[34];
     bool inplace_transform = false;
-    int ipp_norm_flag = 0;
 #ifdef HAVE_IPP
     void *spec_r = 0, *spec_c = 0;
+    int ipp_norm_flag = !(flags & DFT_SCALE) ? 8 : inv ? 2 : 1;
 #endif
 
     CV_Assert( type == CV_32FC1 || type == CV_32FC2 || type == CV_64FC1 || type == CV_64FC2 );
@@ -1506,8 +1506,6 @@ void cv::dft( InputArray _src0, OutputArray _dst, int flags, int nonzero_rows )
          (src.cols > 1 && inv && real_transform)) )
         stage = 1;
 
-    ipp_norm_flag = !(flags & DFT_SCALE) ? 8 : inv ? 2 : 1;
-
     for(;;)
     {
         double scale = 1;

modules/core/src/stat.cpp

@@ -1592,11 +1592,6 @@ struct BatchDistInvoker
     {
         AutoBuffer<int> buf(src2->rows);
         int* bufptr = buf;
-        Cv32suf val0;
-        if( dist->type() == CV_32S )
-            val0.i = INT_MAX;
-        else
-            val0.f = FLT_MAX;
         
         for( int i = range.begin(); i < range.end(); i++ )
         {

modules/core/test/test_math.cpp

@@ -1932,10 +1932,9 @@ void Core_SVDTest::prepare_to_validation( int /*test_case_idx*/ )
 {
     Mat& input = test_mat[INPUT][0];
     int depth = input.depth();
-    int m = input.rows, n = input.cols, min_size = MIN(m, n);
+    int i, m = input.rows, n = input.cols, min_size = MIN(m, n);
     Mat *src, *dst, *w;
     double prev = 0, threshold = depth == CV_32F ? FLT_EPSILON : DBL_EPSILON;
-    int i, step;
     
     if( have_u )
     {
@@ -1954,7 +1953,6 @@ void Core_SVDTest::prepare_to_validation( int /*test_case_idx*/ )
     }
     
     w = &test_mat[TEMP][0];
-    step = w->rows == 1 ? 1 : (int)w->step1();
     for( i = 0; i < min_size; i++ )
     {
         double normval = 0, aii;