Merge remote-tracking branch 'upstream/3.4' into merge-3.4

modules/objdetect/src/haar.cpp

@@ -67,6 +67,11 @@
 #  endif
 #endif
 
+#if defined __GNUC__ && __GNUC__ >= 8
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
+
 /* these settings affect the quality of detection: change with care */
 #define CV_ADJUST_FEATURES 1
 #define CV_ADJUST_WEIGHTS  0
@@ -599,7 +604,7 @@ cvSetImagesForHaarClassifierCascade( CvHaarClassifierCascade* _cascade,
                     else
                         sum0 += hidfeature->rect[k].weight * tr.width * tr.height;
                 }
-
+                CV_Assert(area0 > 0);
                 hidfeature->rect[0].weight = (float)(-sum0/area0);
             } /* l */
         } /* j */
@@ -2290,4 +2295,8 @@ CvType haar_type( CV_TYPE_NAME_HAAR, icvIsHaarClassifier,
                   icvReadHaarClassifier, icvWriteHaarClassifier,
                   icvCloneHaarClassifier );
 
+#if defined __GNUC__ && __GNUC__ >= 8
+#pragma GCC diagnostic pop
+#endif
+
 /* End of file. */