From 38de2a875402808fb32afadff17c413222e8cc68 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Mon, 17 Sep 2018 22:16:31 +0000
Subject: [PATCH] calib3d: fix build warnings

---
 modules/calib3d/src/chessboard.cpp         | 3 +++
 modules/calib3d/test/test_chesscorners.cpp | 1 +
 2 files changed, 4 insertions(+)

diff --git a/modules/calib3d/src/chessboard.cpp b/modules/calib3d/src/chessboard.cpp
index f2d10e793a..08e47d1fe8 100644
--- a/modules/calib3d/src/chessboard.cpp
+++ b/modules/calib3d/src/chessboard.cpp
@@ -2557,6 +2557,7 @@ std::vector<cv::Point2f> Chessboard::Board::getContour()const
                 last = 1;
                 break;
             }
+            /* fallthrough */
         case 2: // right
             if(iter.right(true))
             {
@@ -2566,6 +2567,7 @@ std::vector<cv::Point2f> Chessboard::Board::getContour()const
                 last = 2;
                 break;
             }
+            /* fallthrough */
         case 3: // bottom
             if(iter.bottom(true))
             {
@@ -2575,6 +2577,7 @@ std::vector<cv::Point2f> Chessboard::Board::getContour()const
                 last = 3;
                 break;
             }
+            /* fallthrough */
         case 4: // left
             if(iter.left(true))
             {
diff --git a/modules/calib3d/test/test_chesscorners.cpp b/modules/calib3d/test/test_chesscorners.cpp
index f0e3378bb6..f19fb8d64d 100644
--- a/modules/calib3d/test/test_chesscorners.cpp
+++ b/modules/calib3d/test/test_chesscorners.cpp
@@ -148,6 +148,7 @@ void CV_ChessboardDetectorTest::run( int /*start_from */)
     {
         case CHESSBOARD_SB:
             checkByGeneratorHighAccuracy();      // not supported by CHESSBOARD
+            /* fallthrough */
         case CHESSBOARD:
             checkByGenerator();
             if (ts->get_err_code() != cvtest::TS::OK)