diff --git a/cmake/OpenCVPCHSupport.cmake b/cmake/OpenCVPCHSupport.cmake
index 290dbd8f66..fac6bd409b 100644
--- a/cmake/OpenCVPCHSupport.cmake
+++ b/cmake/OpenCVPCHSupport.cmake
@@ -182,10 +182,20 @@ MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )
 
     _PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
     #MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
-    SET_TARGET_PROPERTIES(${_targetName}
-      PROPERTIES
-      COMPILE_FLAGS ${_target_cflags}
-      )
+
+    GET_TARGET_PROPERTY(_sources ${_targetName} SOURCES)
+    FOREACH(src ${_sources})
+      if(NOT "${src}" MATCHES "\\.mm$")
+        get_source_file_property(_flags "${src}" COMPILE_FLAGS)
+        if(_flags)
+          set(_flags "${_flags} ${_target_cflags}")
+        else()
+          set(_flags "${_target_cflags}")
+        endif()
+
+        set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_flags}")
+      endif()
+    ENDFOREACH()
 
     ADD_CUSTOM_TARGET(pch_Generate_${_targetName}
       DEPENDS ${_pch_output_to_use}
diff --git a/modules/contrib/src/rgbdodometry.cpp b/modules/contrib/src/rgbdodometry.cpp
index 1c80e9c55d..4e9d8c4df9 100644
--- a/modules/contrib/src/rgbdodometry.cpp
+++ b/modules/contrib/src/rgbdodometry.cpp
@@ -59,6 +59,9 @@
 #  ifdef ANDROID
      template <typename Scalar> Scalar log2(Scalar v) { using std::log; return log(v)/log(Scalar(2)); }
 #  endif
+#  if defined __GNUC__ && defined __APPLE__
+#    pragma GCC diagnostic ignored "-Wshadow"
+#  endif
 #  include <unsupported/Eigen/MatrixFunctions>
 #  include <Eigen/Dense>
 #endif
diff --git a/modules/highgui/src/cap_qtkit.mm b/modules/highgui/src/cap_qtkit.mm
index 783d0d1576..c7afffa075 100644
--- a/modules/highgui/src/cap_qtkit.mm
+++ b/modules/highgui/src/cap_qtkit.mm
@@ -503,6 +503,9 @@ bool CvCaptureCAM::setProperty(int property_id, double value) {
   didOutputVideoFrame:(CVImageBufferRef)videoFrame
      withSampleBuffer:(QTSampleBuffer *)sampleBuffer
        fromConnection:(QTCaptureConnection *)connection {
+    (void)captureOutput;
+    (void)sampleBuffer;
+    (void)connection;
 
     CVBufferRetain(videoFrame);
     CVImageBufferRef imageBufferToRelease  = mCurrentImageBuffer;
@@ -519,6 +522,9 @@ bool CvCaptureCAM::setProperty(int property_id, double value) {
 - (void)captureOutput:(QTCaptureOutput *)captureOutput
 didDropVideoFrameWithSampleBuffer:(QTSampleBuffer *)sampleBuffer
        fromConnection:(QTCaptureConnection *)connection {
+    (void)captureOutput;
+    (void)sampleBuffer;
+    (void)connection;
     cout << "Camera dropped frame!" << endl;
 }
 
diff --git a/modules/highgui/src/grfmt_exr.cpp b/modules/highgui/src/grfmt_exr.cpp
index ffae129662..c29f4ba36e 100644
--- a/modules/highgui/src/grfmt_exr.cpp
+++ b/modules/highgui/src/grfmt_exr.cpp
@@ -48,6 +48,10 @@
 #  pragma warning( disable: 4100 4244 4267 )
 #endif
 
+#if defined __GNUC__ && defined __APPLE__
+#  pragma GCC diagnostic ignored "-Wshadow"
+#endif
+
 #include <ImfHeader.h>
 #include <ImfInputFile.h>
 #include <ImfOutputFile.h>
diff --git a/modules/highgui/src/grfmt_exr.hpp b/modules/highgui/src/grfmt_exr.hpp
index 9c8c609d00..b9467c6d26 100644
--- a/modules/highgui/src/grfmt_exr.hpp
+++ b/modules/highgui/src/grfmt_exr.hpp
@@ -45,6 +45,10 @@
 
 #ifdef HAVE_OPENEXR
 
+#if defined __GNUC__ && defined __APPLE__
+#  pragma GCC diagnostic ignored "-Wshadow"
+#endif
+
 #include <ImfChromaticities.h>
 #include <ImfInputFile.h>
 #include <ImfChannelList.h>
diff --git a/modules/highgui/src/window_cocoa.mm b/modules/highgui/src/window_cocoa.mm
index 886fde9339..d3a68107fc 100644
--- a/modules/highgui/src/window_cocoa.mm
+++ b/modules/highgui/src/window_cocoa.mm
@@ -136,7 +136,7 @@ static bool wasInitialized = false;
     }
 }*/
 
-CV_IMPL int cvInitSystem( int argc, char** argv)
+CV_IMPL int cvInitSystem( int , char** )
 {
     //cout << "cvInitSystem" << endl;
     wasInitialized = true;
@@ -159,7 +159,7 @@ CV_IMPL int cvInitSystem( int argc, char** argv)
     return 0;
 }
 
-CVWindow *cvGetWindow(const char *name) {
+static CVWindow *cvGetWindow(const char *name) {
     //cout << "cvGetWindow" << endl;
     NSAutoreleasePool* localpool = [[NSAutoreleasePool alloc] init];
     NSString *cvname = [NSString stringWithFormat:@"%s", name];
@@ -614,6 +614,7 @@ void cvSetModeWindow_COCOA( const char* name, double prop_value )
 @synthesize status;
 
 - (void)cvSendMouseEvent:(NSEvent *)event type:(int)type flags:(int)flags {
+    (void)event;
     //cout << "cvSendMouseEvent" << endl;
     NSPoint mp = [NSEvent mouseLocation];
     //NSRect visible = [[self contentView] frame];
@@ -924,6 +925,7 @@ void cvSetModeWindow_COCOA( const char* name, double prop_value )
 }
 
 - (void)sliderChanged:(NSNotification *)notification {
+    (void)notification;
     int pos = [slider intValue];
     if(value)
         *value = pos;
diff --git a/modules/legacy/src/_kdtree.hpp b/modules/legacy/src/_kdtree.hpp
index ba9097a44e..48925eedae 100644
--- a/modules/legacy/src/_kdtree.hpp
+++ b/modules/legacy/src/_kdtree.hpp
@@ -169,7 +169,7 @@ private:
 
       __instype *split = median;
       for (; split != last && deref(ctor(*split), dim) ==
-       deref(ctor(*median), dim); ++split);
+       deref(ctor(*median), dim); ++split) {}
 
       if (split == last) { // leaf
   int nexti = -1;
@@ -387,9 +387,8 @@ public:
   // ret_nn_pq is an array containing the (at most) k nearest neighbors
   // (see bbf_nn structure def above).
   template < class __desctype >
-  int find_nn_bbf(const __desctype * d,
-      int k, int emax,
-      bbf_nn_pqueue & ret_nn_pq) const {
+  int find_nn_bbf(const __desctype * d, int k, int emax, bbf_nn_pqueue & ret_nn_pq) const
+  {
     assert(k > 0);
     ret_nn_pq.clear();
 
@@ -400,7 +399,8 @@ public:
     // iterate while queue non-empty and emax>0
     tmp_pq.clear();
     tmp_pq.push_back(bbf_node(root_node, 0));
-    while (tmp_pq.size() && emax > 0) {
+    while (tmp_pq.size() && emax > 0)
+    {
 
       // from node nearest query point d, run to leaf
       std::pop_heap(tmp_pq.begin(), tmp_pq.end());
@@ -408,18 +408,17 @@ public:
       tmp_pq.erase(tmp_pq.end() - 1);
 
       int i;
-      for (i = bbf.node;
-     i != -1 && nodes[i].dim >= 0;
-     i = bbf_branch(i, d, tmp_pq));
+      for (i = bbf.node; i != -1 && nodes[i].dim >= 0; i = bbf_branch(i, d, tmp_pq)) {}
 
-      if (i != -1) {
+      if (i != -1)
+      {
 
-  // add points in leaf/bin to ret_nn_pq
-  do {
-    bbf_new_nn(ret_nn_pq, k, d, nodes[i].value);
-  } while (-1 != (i = nodes[i].right));
+        // add points in leaf/bin to ret_nn_pq
+        do {
+          bbf_new_nn(ret_nn_pq, k, d, nodes[i].value);
+        } while (-1 != (i = nodes[i].right));
 
-  --emax;
+        --emax;
       }
     }
 
diff --git a/modules/legacy/src/dpstereo.cpp b/modules/legacy/src/dpstereo.cpp
index 1c6881e894..a55e1cafbb 100644
--- a/modules/legacy/src/dpstereo.cpp
+++ b/modules/legacy/src/dpstereo.cpp
@@ -414,7 +414,7 @@ static void icvFindStereoCorrespondenceByBirchfieldDP( uchar* src1, uchar* src2,
         for( x = 1; x < imgW; x++ )
         {
             i = x - 1;
-            for( ; x < imgW && dest[y*widthStep+x] == dest[y*widthStep+x-1]; x++ );
+            for( ; x < imgW && dest[y*widthStep+x] == dest[y*widthStep+x-1]; x++ ) {}
             s = x - i;
             for( ; i < x; i++ )
             {
diff --git a/modules/legacy/src/testseq.cpp b/modules/legacy/src/testseq.cpp
index 37e19f79fd..d3521a5ae2 100644
--- a/modules/legacy/src/testseq.cpp
+++ b/modules/legacy/src/testseq.cpp
@@ -633,7 +633,7 @@ static CvTestSeqElem* icvTestSeqReadElemOne(CvTestSeq_* pTS, CvFileStorage* fs,
 
             for(i0=0, i1=1; i1<KeyFrameNum;)
             {
-                for(i1=i0+1; i1<KeyFrameNum && KeyFrames[i1]<0; i1++);
+                for(i1=i0+1; i1<KeyFrameNum && KeyFrames[i1]<0; i1++) {}
 
                 assert(i1<KeyFrameNum);
                 assert(i1>i0);
@@ -779,7 +779,7 @@ static CvTestSeqElem* icvTestSeqReadElemAll(CvTestSeq_* pTS, CvFileStorage* fs,
             }
 
             /* Find last element: */
-            for(pElemLast=pElemNew;pElemLast && pElemLast->next;pElemLast= pElemLast->next);
+            for(pElemLast=pElemNew;pElemLast && pElemLast->next;pElemLast= pElemLast->next) {}
 
         }   /* Next element. */
     }   /*  Read all element in sequence. */
@@ -842,7 +842,7 @@ CvTestSeq* cvCreateTestSeq(char* pConfigfile, char** videos, int numvideo, float
         else
         {
             CvTestSeqElem* p = NULL;
-            for(p=pTS->pElemList;p->next;p=p->next);
+            for(p=pTS->pElemList;p->next;p=p->next) {}
             p->next = pElemNew;
         }
     }   /* Read all videos. */