diff --git a/modules/calib3d/perf/perf_undistort.cpp b/modules/calib3d/perf/perf_undistort.cpp
new file mode 100644
index 0000000000..e0ee113c2f
--- /dev/null
+++ b/modules/calib3d/perf/perf_undistort.cpp
@@ -0,0 +1,21 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html
+#include "perf_precomp.hpp"
+
+namespace opencv_test
+{
+using namespace perf;
+
+PERF_TEST(Undistort, InitUndistortMap)
+{
+    Size size_w_h(512 + 3, 512);
+    Mat k(3, 3, CV_32FC1);
+    Mat d(1, 14, CV_64FC1);
+    Mat dst(size_w_h, CV_32FC2);
+    declare.in(k, d, WARMUP_RNG).out(dst);
+    TEST_CYCLE() initUndistortRectifyMap(k, d, noArray(), k, size_w_h, CV_32FC2, dst, noArray());
+    SANITY_CHECK_NOTHING();
+}
+
+} // namespace
diff --git a/modules/core/include/opencv2/core/cvdef.h b/modules/core/include/opencv2/core/cvdef.h
index 079f24c12a..7b81a17664 100644
--- a/modules/core/include/opencv2/core/cvdef.h
+++ b/modules/core/include/opencv2/core/cvdef.h
@@ -627,7 +627,7 @@ Cv64suf;
 \****************************************************************************************/
 
 #ifndef CV_NOEXCEPT
-#  if defined(CV_CXX11) && (!defined(_MSC_VER) || _MSC_VER > 1800) /* MSVC 2015 and above */
+#  if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1900/*MSVS 2015*/)
 #    define CV_NOEXCEPT noexcept
 #  endif
 #endif
diff --git a/modules/core/test/test_ptr.cpp b/modules/core/test/test_ptr.cpp
index ffeb443a1d..d3186afb43 100644
--- a/modules/core/test/test_ptr.cpp
+++ b/modules/core/test/test_ptr.cpp
@@ -43,10 +43,6 @@
 
 namespace opencv_test { namespace {
 
-#if defined __clang__ && defined __APPLE__
-#pragma clang diagnostic ignored "-Wself-assign-overloaded"  // explicitly assigning value of variable of type '...' to itself (p1 = p1)
-#endif
-
 #ifdef GTEST_CAN_COMPARE_NULL
 #  define EXPECT_NULL(ptr) EXPECT_EQ(NULL, ptr)
 #else
@@ -161,7 +157,7 @@ TEST(Core_Ptr, assignment)
 
     {
         Ptr<Reporter> p1(new Reporter(&deleted1));
-        p1 = p1;
+        p1 = *&p1;
         EXPECT_FALSE(deleted1);
     }
 
diff --git a/modules/imgproc/perf/perf_warp.cpp b/modules/imgproc/perf/perf_warp.cpp
index e31a687229..53bacc16d3 100644
--- a/modules/imgproc/perf/perf_warp.cpp
+++ b/modules/imgproc/perf/perf_warp.cpp
@@ -290,15 +290,4 @@ PERF_TEST(Transform, getPerspectiveTransform_1000)
     SANITY_CHECK_NOTHING();
 }
 
-PERF_TEST(Undistort, InitUndistortMap)
-{
-    Size size_w_h(512 + 3, 512);
-    Mat k(3, 3, CV_32FC1);
-    Mat d(1, 14, CV_64FC1);
-    Mat dst(size_w_h, CV_32FC2);
-    declare.in(k, d, WARMUP_RNG).out(dst);
-    TEST_CYCLE() initUndistortRectifyMap(k, d, noArray(), k, size_w_h, CV_32FC2, dst, noArray());
-    SANITY_CHECK_NOTHING();
-}
-
 } // namespace