Fixed several GCC 5.x warnings

3rdparty/libtiff/CMakeLists.txt

@@ -95,7 +95,7 @@ ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4267 /wd4305 /wd4306) # vs2008 Win64
 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4703) # vs2012
 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4456 /wd4457 /wd4312) # vs2015
 
-ocv_warnings_disable(CMAKE_C_FLAGS /wd4267 /wd4244 /wd4018)
+ocv_warnings_disable(CMAKE_C_FLAGS /wd4267 /wd4244 /wd4018 /wd4311 /wd4312)
 
 if(UNIX AND (CMAKE_COMPILER_IS_GNUCXX OR CV_ICC))
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")

cmake/OpenCVCompilerOptions.cmake

@@ -97,6 +97,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
     add_extra_compiler_option(-Wno-narrowing)
     add_extra_compiler_option(-Wno-delete-non-virtual-dtor)
     add_extra_compiler_option(-Wno-unnamed-type-template-args)
+    add_extra_compiler_option(-Wno-comment)
   endif()
   add_extra_compiler_option(-fdiagnostics-show-option)
 

modules/core/include/opencv2/core/utility.hpp

@@ -1126,7 +1126,7 @@ CV_EXPORTS InstrNode* getTrace();
 CV_EXPORTS void       resetTrace();
 CV_EXPORTS void       setFlags(int modeFlags);
 CV_EXPORTS int        getFlags();
-};
+}
 
 } //namespace cv
 

modules/core/perf/perf_umat.cpp

@@ -13,7 +13,6 @@ using namespace ::testing;
 using std::tr1::tuple;
 using std::tr1::get;
 
-namespace {
 
 struct OpenCLState
 {
@@ -64,5 +63,3 @@ OCL_PERF_TEST_P(UMatTest, CustomPtr, Combine(Values(sz1080p, sz2160p), Bool(), :
 
     SANITY_CHECK_NOTHING();
 }
-
-} // namespace cvtest

modules/core/test/test_ds.cpp

@@ -56,7 +56,7 @@ static void cvTsSimpleSeqShiftAndCopy( CvTsSimpleSeq* seq, int from_idx, int to_
                 (seq->count - from_idx)*elem_size );
     }
     seq->count += to_idx - from_idx;
-    if( elem && to_idx > from_idx )
+    if( elem )
         memcpy( seq->array + from_idx*elem_size, elem, (to_idx - from_idx)*elem_size );
 }
 

modules/features2d/include/opencv2/features2d.hpp

@@ -1022,7 +1022,7 @@ protected:
 
 /** @brief Flann-based descriptor matcher.
 
-This matcher trains flann::Index_ on a train descriptor collection and calls its nearest search
+This matcher trains cv::flann::Index on a train descriptor collection and calls its nearest search
 methods to find the best matches. So, this matcher may be faster when matching a large train
 collection than the brute force matcher. FlannBasedMatcher does not support masking permissible
 matches of descriptor sets because flann::Index does not support this. :