how to use cmakelists find_path required

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# toplevel CMakeLists.txt for a catkin workspace # catkin/cmake/toplevel.cmake cmake_minimum_required(VERSION 3.0.2) project(Project) set(CATKIN_TOPLEVEL TRUE) # search for catkin within the workspace set(_cmd "catkin_find_pkg" "catkin" "${CMAKE_SOURCE_DIR}") execute_process(COMMAND ${_cmd} RESULT_VARIABLE _res OUTPUT_VARIABLE _out ERROR_VARIABLE _err OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_STRIP_TRAILING_WHITESPACE ) if(NOT _res EQUAL 0 AND NOT _res EQUAL 2) # searching fot catkin resulted in an error string(REPLACE ";" " " _cmd_str "${_cmd}") message(FATAL_ERROR "Search for 'catkin' in workspace failed (${_cmd_str}): ${_err}") endif() # include catkin from workspace or via find_package() if(_res EQUAL 0) set(catkin_EXTRAS_DIR "${CMAKE_SOURCE_DIR}/${_out}/cmake") # include all.cmake without add_subdirectory to let it operate in same scope include(${catkin_EXTRAS_DIR}/all.cmake NO_POLICY_SCOPE) add_subdirectory("${_out}") else() # use either CMAKE_PREFIX_PATH explicitly passed to CMake as a command line argument # or CMAKE_PREFIX_PATH from the environment if(NOT DEFINED CMAKE_PREFIX_PATH) if(NOT "$ENV{CMAKE_PREFIX_PATH}" STREQUAL "") if(NOT WIN32) string(REPLACE ":" ";" CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH}) else() set(CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH}) endif() endif() endif() # list of catkin workspaces set(catkin_search_path "") foreach(path ${CMAKE_PREFIX_PATH}) if(EXISTS "${path}/.catkin") list(FIND catkin_search_path ${path} _index) if(_index EQUAL -1) list(APPEND catkin_search_path ${path}) endif() endif() endforeach() # search for catkin in all workspaces set(CATKIN_TOPLEVEL_FIND_PACKAGE TRUE) find_package(catkin QUIET NO_POLICY_SCOPE PATHS ${catkin_search_path} NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH) unset(CATKIN_TOPLEVEL_FIND_PACKAGE) if(NOT catkin_FOUND) message(FATAL_ERROR "find_package(catkin) failed. catkin was neither found in the workspace nor in the CMAKE_PREFIX_PATH. One reason may be that no ROS setup.sh was sourced before.") endif() endif() catkin_workspace()在哪添加target_link_libraries(your_target_name avcodec avformat swscale)

在您的 CMakeLists.txt 文件中，将 `target_link_libraries()` 指令添加到 `add_subdirectory("${_out}")` 的下方。具体位置如下所示：

...

# include catkin from workspace or via find_package()
if(_res EQUAL 0)
  set(catkin_EXTRAS_DIR "${CMAKE_SOURCE_DIR}/${_out}/cmake")
  # include all.cmake without add_subdirectory to let it operate in same scope
  include(${catkin_EXTRAS_DIR}/all.cmake NO_POLICY_SCOPE)
  add_subdirectory("${_out}")

  # Add the target_link_libraries() here
  target_link_libraries(your_target_name avcodec avformat swscale)

else
  # use either CMAKE_PREFIX_PATH explicitly passed to CMake as a command line argument
  # or CMAKE_PREFIX_PATH from the environment
  if(NOT DEFINED CMAKE_PREFIX_PATH)
    if(NOT "$ENV{CMAKE_PREFIX_PATH}" STREQUAL "")
      if(NOT WIN32)
        string(REPLACE ":" ";" CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH})
      else()
        set(CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH})
      endif()
    endif()
  endif()

  ...
endif()

...

请注意将 `your_target_name` 替换为您实际的目标名称。这将在生成目标时链接 avcodec、avformat 和 swscale 库。

如果您还有其他问题，请随时提问。

cmakelists link_libraries target_link_libraies

在CMakeLists.txt文件中，出现了错误信息"Cannot specify link libraries for target 'FilterSamesetBasic' which is not built by this project"。根据引用提供的信息，这个错误通常是因为在目标"FilterSamesetBasic"不存在于该项目中，所以不能指定链接库。

如果您想链接自己路径下的OpenCV库，可以参考引用中提供的方法。在CMakeLists.txt中，可以使用add_library命令将源文件生成一个库，并使用target_link_libraries命令将该库链接到目标上。例如，可以使用以下命令将名为"libsugan"的库链接到目标上：

add_library(libsugan ${SRC_LISTS})
target_link_libraries(libsugan ${OpenCV_LIBS} ${PROJECT_SOURCE_DIR}/lib/libCommonUtilities.so ${PROJECT_SOURCE_DIR}/lib/libInuStreams.so)

这样就将libsugan库链接到目标上，并且链接了OpenCV库、libCommonUtilities.so和libInuStreams.so等其他库。更多关于CMake的使用可以参考引用中的文章。

总结：在CMakeLists.txt中，可以使用target_link_libraries命令将库链接到目标上，并使用add_library命令生成库。引用提供了解决链接库错误的问题，而引用和引用提供了使用CMake链接自己路径下的库的方法。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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