Compile OpenCV with GCC visibility set to hidden

modules/ts/include/opencv2/ts.hpp

@@ -1,16 +1,7 @@
 #ifndef __OPENCV_GTESTCV_HPP__
 #define __OPENCV_GTESTCV_HPP__
 
-#ifdef HAVE_CVCONFIG_H
-#  include "cvconfig.h"
-#endif
-
-#ifndef GTEST_CREATE_SHARED_LIBRARY
-#ifdef BUILD_SHARED_LIBS
-#define GTEST_LINKED_AS_SHARED_LIBRARY 1
-#endif
-#endif
-
+#include "opencv2/core/cvdef.h"
 #include <stdarg.h> // for va_list
 
 #ifdef _MSC_VER

modules/ts/include/opencv2/ts/ts_gtest.h

@@ -1912,19 +1912,7 @@ using ::std::tuple_size;
 
 #endif  // GTEST_HAS_SEH
 
-#ifdef _MSC_VER
-
-# if GTEST_LINKED_AS_SHARED_LIBRARY
-#  define GTEST_API_ __declspec(dllimport)
-# elif GTEST_CREATE_SHARED_LIBRARY
-#  define GTEST_API_ __declspec(dllexport)
-# endif
-
-#endif  // _MSC_VER
-
-#ifndef GTEST_API_
-# define GTEST_API_
-#endif
+#define GTEST_API_ CV_EXPORTS
 
 #ifdef __GNUC__
 // Ask the compiler to never inline a given function.

modules/ts/include/opencv2/ts/ts_perf.hpp

@@ -1,16 +1,6 @@
 #ifndef __OPENCV_TS_PERF_HPP__
 #define __OPENCV_TS_PERF_HPP__
 
-#ifdef HAVE_CVCONFIG_H
-#  include "cvconfig.h"
-#endif
-
-#ifndef GTEST_CREATE_SHARED_LIBRARY
-#  ifdef BUILD_SHARED_LIBS
-#    define GTEST_LINKED_AS_SHARED_LIBRARY 1
-#  endif
-#endif
-
 #include "opencv2/core.hpp"
 #include "ts_gtest.h"