Merge pull request #9186 from alalek:cmake_fix_dump_duplication

cmake/OpenCVUtils.cmake

@@ -2,21 +2,22 @@ include(CMakeParseArguments)
 
 # Debugging function
 function(ocv_cmake_dump_vars)
-  set(VARS "")
-  get_cmake_property(_variableNames VARIABLES)
+  get_cmake_property(__variableNames VARIABLES)
   cmake_parse_arguments(DUMP "" "TOFILE" "" ${ARGN})
   set(regex "${DUMP_UNPARSED_ARGUMENTS}")
   string(TOLOWER "${regex}" regex_lower)
-  foreach(_variableName ${_variableNames})
-    string(TOLOWER "${_variableName}" _variableName_lower)
-    if(_variableName MATCHES "${regex}" OR _variableName_lower MATCHES "${regex_lower}")
-      set(VARS "${VARS}${_variableName}=${${_variableName}}\n")
+  set(__VARS "")
+  foreach(__variableName ${__variableNames})
+    string(TOLOWER "${__variableName}" __variableName_lower)
+    if((__variableName MATCHES "${regex}" OR __variableName_lower MATCHES "${regex_lower}")
+        AND NOT __variableName_lower MATCHES "^__")
+      set(__VARS "${__VARS}${__variableName}=${${__variableName}}\n")
     endif()
   endforeach()
   if(DUMP_TOFILE)
-    file(WRITE ${CMAKE_BINARY_DIR}/${DUMP_TOFILE} "${VARS}")
+    file(WRITE ${CMAKE_BINARY_DIR}/${DUMP_TOFILE} "${__VARS}")
   else()
-    message(AUTHOR_WARNING "${VARS}")
+    message(AUTHOR_WARNING "${__VARS}")
   endif()
 endfunction()