cmake中使用find_package时，源库在编译时会把INCLUDE_DIR存在哪里

在使用find_package查找外部库时，库的头文件路径会被存储在变量中，该变量的名称通常为库名的大写字母加上下划线和INCLUDE_DIR，例如对于OpenCV库，其头文件路径的变量名为OPENCV_INCLUDE_DIR。该变量可以在CMakeLists.txt文件中使用，例如：

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})

在上面的例子中，使用find_package查找OpenCV库后，可以通过引用变量${OpenCV_INCLUDE_DIRS}来指定OpenCV库的头文件路径，从而在编译时正确地包含OpenCV库的头文件。

相关问题

# 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()

根据您提供的 CMakeLists.txt 文件，这是一个用于构建 catkin 工作空间的顶层 CMakeLists.txt 文件。该文件负责搜索并包含 catkin 软件包。

首先，它尝试在工作空间内搜索并包含 catkin 软件包。如果成功找到并包含了 catkin 软件包，则会添加子目录并编译该软件包。

如果在工作空间内未找到 catkin 软件包，则会尝试使用 CMAKE_PREFIX_PATH 环境变量或作为命令行参数传递给 CMake 的 CMAKE_PREFIX_PATH 变量来搜索 catkin。它会在 CMAKE_PREFIX_PATH 中搜索所有可能的 catkin 工作空间，并尝试找到 catkin 软件包。

如果仍然无法找到 catkin 软件包，则会输出错误消息。

此外，它还调用了 `catkin_workspace()` 函数，用于标记当前目录为 catkin 工作空间。

请确保您的系统中已经正确安装了 catkin，并且工作空间的目录结构和设置是正确的。如果您遇到任何问题，请提供更多详细信息，我将尽力帮助您解决问题。

cmake_minimum_required(VERSION 2.8.3) project(ego_planner) set(CMAKE_BUILD_TYPE "Release") ADD_COMPILE_OPTIONS(-std=c++11 ) ADD_COMPILE_OPTIONS(-std=c++14 ) set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall -g") find_package(Eigen3 REQUIRED) find_package(PCL 1.7 REQUIRED) find_package(catkin REQUIRED COMPONENTS roscpp std_msgs geometry_msgs quadrotor_msgs plan_env path_searching bspline_opt traj_utils message_generation cv_bridge ) # catkin_package(CATKIN_DEPENDS message_runtime) catkin_package( INCLUDE_DIRS include LIBRARIES ego_planner CATKIN_DEPENDS plan_env path_searching bspline_opt traj_utils # DEPENDS system_lib ) include_directories( include SYSTEM ${catkin_INCLUDE_DIRS} ${PROJECT_SOURCE_DIR}/include ${EIGEN3_INCLUDE_DIR} ${PCL_INCLUDE_DIRS} ) add_executable(ego_planner_node src/ego_planner_node.cpp src/ego_replan_fsm.cpp src/planner_manager.cpp ) target_link_libraries(ego_planner_node ${catkin_LIBRARIES} ) #add_dependencies(ego_planner_node ${${PROJECT_NAME}_EXPORTED_TARGETS}) add_executable(traj_server src/traj_server.cpp) target_link_libraries(traj_server ${catkin_LIBRARIES}) #add_dependencies(traj_server ${${PROJECT_NAME}_EXPORTED_TARGETS})

这段代码是一个 CMakeLists.txt 文件，用于编译一个名为 ego_planner 的工程。该工程依赖于 Eigen3 和 PCL 库，同时也依赖于一些 ROS 的组件，如 roscpp、std_msgs、geometry_msgs、quadrotor_msgs、plan_env、path_searching、bspline_opt、traj_utils 和 message_generation。该工程包含两个可执行文件，一个是 ego_planner_node，另一个是 traj_server。其中 ego_planner_node.cpp 是主程序，它包含了 ego_replan_fsm.cpp 和 planner_manager.cpp 两个文件。traj_server.cpp 是用于生成轨迹的服务器程序。在编译过程中，使用了 C++11 和 C++14 标准，同时开启了 Release 模式。