Fixed build warnings (including error in FAST)

modules/contrib/src/stereovar.cpp

@@ -67,11 +67,12 @@ StereoVar::~StereoVar()
 
 static Mat diffX(Mat &src)
 {
-    register int x, y, cols = src.cols - 1;
+    int cols = src.cols - 1;
     Mat dst(src.size(), src.type());
-    for(y = 0; y < src.rows; y++){
+    for(int y = 0; y < src.rows; y++){
         const float* pSrc = src.ptr<float>(y);
         float* pDst = dst.ptr<float>(y);
+        int x = 0;
 #if CV_SSE2
         for (x = 0; x <= cols - 8; x += 8) {
             __m128 a0 = _mm_loadu_ps(pSrc + x);

modules/features2d/src/fast.cpp

@@ -350,7 +350,7 @@ int cornerScore<8>(const uchar* ptr, const int pixel[], int threshold)
     }
 
     int b0 = -a0;
-    for( k = 0; k < 12; k += 2 )
+    for( k = 0; k < 8; k += 2 )
     {
         int b = std::max((int)d[k+1], (int)d[k+2]);
         b = std::max(b, (int)d[k+3]);
@@ -375,7 +375,10 @@ template<int patternSize>
 void FAST_t(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold, bool nonmax_suppression)
 {
     Mat img = _img.getMat();
-    const int K = patternSize/2, N = patternSize + K + 1, quarterPatternSize = patternSize/4;
+    const int K = patternSize/2, N = patternSize + K + 1;
+#if CV_SSE2
+    const int quarterPatternSize = patternSize/4;
+#endif
     int i, j, k, pixel[25];
     makeOffsets(pixel, (int)img.step, patternSize);
     for(k = patternSize; k < 25; k++)

modules/imgproc/src/smooth.cpp

@@ -1353,8 +1353,8 @@ public:
     }
 
 private:
-    const Mat *temp;
     Mat *dest;
+    const Mat *temp;
     int radius, maxk, *space_ofs;
     float *space_weight, *color_weight;
 };

modules/video/src/bgfg_gmg.cpp

@@ -440,7 +440,6 @@ bool BackgroundSubtractorGMG::HistogramFeatureGMG::operator ==(HistogramFeatureG
     std::vector<size_t>::iterator color_a;
     std::vector<size_t>::iterator color_b;
     std::vector<size_t>::iterator color_a_end = this->color.end();
-    std::vector<size_t>::iterator color_b_end = rhs.color.end();
     for (color_a = color.begin(), color_b = rhs.color.begin(); color_a != color_a_end; ++color_a, ++color_b)
     {
         if (*color_a != *color_b)