message: cmake: support rpath-link linker option
  builds with CMAKE_SKIP_RPATH=ON should properly find project .so files from <build>/lib directory
  $ORIGIN doesn't work properly in cross-compilation mode
diff: @@ -396,3 +396,23 @@ macro(ocv_add_modules_compiler_options)
  add_definitions(-DOPENCV_ENABLE_MEMORY_SANITIZER=1)
  endif()
  endmacro()
  +
  +# adjust -Wl,-rpath-link
  +if(CMAKE_SKIP_RPATH)
  + if((NOT CMAKE_CROSSCOMPILING OR OPENCV_ENABLE_LINKER_RPATH_LINK_ORIGIN) AND NOT OPENCV_SKIP_LINKER_RPATH_LINK_ORIGIN)
  + if(DEFINED CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN)
  + list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "${CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN}")
  + else()
  + list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "\$ORIGIN")
  + endif()
  + elseif(NOT OPENCV_SKIP_LINKER_RPATH_LINK_BINARY_LIB)
  + list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "${LIBRARY_OUTPUT_PATH}")
  + endif()
  +endif()
  +if(OPENCV_EXTRA_RPATH_LINK_PATH)
  + string(REPLACE ":" ";" OPENCV_EXTRA_RPATH_LINK_PATH_ "${OPENCV_EXTRA_RPATH_LINK_PATH}")
  + list(APPEND CMAKE_PLATFORM_RUNTIME_PATH ${OPENCV_EXTRA_RPATH_LINK_PATH_})
  + if(NOT CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG)
  + message(WARNING "OPENCV_EXTRA_RPATH_LINK_PATH may not work properly because CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG is not defined (not supported)")
  + endif()
  +endif()
  