cmake的cmake_include_path

CMAKE_INCLUDE_PATH是一个特殊的环境变量，用于指定在编译过程中搜索头文件的路径。可以通过在bash中使用export命令或在csh中使用set命令来设置该变量的值，例如使用export CMAKE_INCLUDE_PATH=/home/include cmake ..来设置CMAKE_INCLUDE_PATH的值。如果头文件不在常规路径（如/usr/include，/usr/local/include等），则可以使用CMAKE_INCLUDE_PATH来补充路径。为了使程序更智能，可以使用CMAKE_INCLUDE_PATH进行设置，例如将INCLUDE_DIRECTORIES(/usr/include/hello)替换为FIND_PATH(myHeader hello.h) IF(myHeader) INCLUDE_DIRECTORIES(${myHeader}) ENDIF(myHeader)。

相关问题

message("CMAKE_PREFIX_PATH = ${CMAKE_PREFIX_PATH}") message("CMAKE_MODULE_PATH = ${CMAKE_MODULE_PATH}")是空的

如果输出的`CMAKE_PREFIX_PATH`和`CMAKE_MODULE_PATH`为空，可能是因为在你的CMakeLists.txt文件中没有显式地设置这些变量的值。在这种情况下，CMake将使用默认的查找路径。

默认情况下，CMake会在以下路径中查找库和头文件：

- 系统路径
- CMAKE_PREFIX_PATH环境变量指定的路径
- CMAKE_INSTALL_PREFIX变量指定的路径
- CMAKE_SYSTEM_PREFIX_PATH变量指定的路径
- CMAKE_SYSTEM_LIBRARY_PATH变量指定的路径
- CMAKE_SYSTEM_INCLUDE_PATH变量指定的路径

如果你想自定义查找路径，可以在CMakeLists.txt中设置`CMAKE_PREFIX_PATH`和`CMAKE_MODULE_PATH`变量的值。例如：

set(CMAKE_PREFIX_PATH "/path/to/my/lib;/path/to/other/lib")
set(CMAKE_MODULE_PATH "/path/to/my/cmake/modules;/path/to/other/cmake/modules")

这样就会在指定的路径中查找库和模块文件。

cmake_minimum_required(VERSION 3.8.0 FATAL_ERROR) project(mcu_kit VERSION 0.1.0 DESCRIPTION "mcu-kit SDK" LANGUAGES C ) set(PROJECT_BRIEF "vDiscovery") set(CMAKE_C_STANDARD 11) set(CMAKE_C_EXTENSIONS ON) set(CMAKE_C_STANDARD_REQUIRED ON) set(CMAKE_CXX_STANDARD 11) set(CMAKE_POSITION_INDEPENDENT_CODE ON) add_compile_options(-Wall) list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake") include(CMakePrintHelpers) include(ConfigureChecks) if(EXISTS "${PROJECT_SOURCE_DIR}/config.cmake") include(config.cmake) else() message(FATAL_ERROR "Can't find cmake.config file") endif() if(${CMAKE_CROSSCOMPILING}) set(LV_SIMULATOR_ON_PC OFF) else() set(LV_SIMULATOR_ON_PC ON) endif() configure_file( "${PROJECT_SOURCE_DIR}/base/base_sdk_version.h.in" "${PROJECT_SOURCE_DIR}/base/base_sdk_version.h" ) configure_file( "${PROJECT_SOURCE_DIR}/base/base_config.h.in" "${PROJECT_SOURCE_DIR}/base/base_config.h" ) set(CMAKE_INSTALL_BINDIR ${CMAKE_INSTALL_PREFIX}/bin) set(CMAKE_INSTALL_SBINDIR ${CMAKE_INSTALL_PREFIX}/sbin) set(CMAKE_INSTALL_LIBDIR ${CMAKE_INSTALL_PREFIX}/lib) set(CMAKE_INSTALL_INCLUDEDIR ${CMAKE_INSTALL_PREFIX}/include) set(CMAKE_INSTALL_SYSCONFDIR ${CMAKE_INSTALL_PREFIX}/etc) set(CMAKE_INSTALL_SHARESTATEDIR ${CMAKE_INSTALL_PREFIX}/com) set(CMAKE_INSTALL_LOCALSTATEDIR ${CMAKE_INSTALL_PREFIX}/var) set(CMAKE_INSTALL_INFODIR ${CMAKE_INSTALL_PREFIX}/info) set(CMAKE_INSTALL_LOCALEDIR ${CMAKE_INSTALL_PREFIX}/locate) set(CMAKE_INSTALL_MANDIR ${CMAKE_INSTALL_PREFIX}/man) set(CMAKE_INSTALL_DOCDIR ${CMAKE_INSTALL_PREFIX}/doc) set(CMAKE_INSTALL_RESDIR ${CMAKE_INSTALL_PREFIX}) include(PrepareInstall) set(KIT_ROOT_DIR ${CMAKE_SOURCE_DIR}) add_subdirectory("base") # add_subdirectory("third-party") add_subdirectory("lib") add_subdirectory("drivers") add_subdirectory("framework") add_subdirectory("sysapp") add_subdirectory("app") include(GeneratePkgConfig) include(Linux-kitInfo)详细注释一下这段代码

这段代码是一个 CMakeLists.txt 文件，用于构建一个名为 "mcu_kit" 的项目。下面是对每行代码的详细注释：

cmake_minimum_required(VERSION 3.8.0 FATAL_ERROR)

指定最低的 CMake 版本，如果当前版本不符合要求，则提示错误。

project(mcu_kit VERSION 0.1.0 DESCRIPTION "mcu-kit SDK" LANGUAGES C)

定义项目名称、版本、描述和使用的编程语言。

set(PROJECT_BRIEF "vDiscovery")

设置一个变量，用于描述项目简介。

set(CMAKE_C_STANDARD 11)
set(CMAKE_C_EXTENSIONS ON)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_CXX_STANDARD 11)

指定使用的 C 和 C++ 标准版本。

set(CMAKE_POSITION_INDEPENDENT_CODE ON)

启用位置独立代码（PIC）选项。

add_compile_options(-Wall)

添加编译选项，这里添加了 -Wall 选项，表示开启所有警告。

list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")

将自定义的 CMake 模块路径添加到 CMAKE_MODULE_PATH 变量中。

include(CMakePrintHelpers)
include(ConfigureChecks)

包含两个自定义的 CMake 模块，用于输出调试信息和配置检查。

if(EXISTS "${PROJECT_SOURCE_DIR}/config.cmake")
    include(config.cmake)
else()
    message(FATAL_ERROR "Can't find cmake.config file")
endif()

如果存在 config.cmake 文件，则包含它，否则输出错误信息并停止构建。

if(${CMAKE_CROSSCOMPILING})
    set(LV_SIMULATOR_ON_PC OFF)
else()
    set(LV_SIMULATOR_ON_PC ON)
endif()

根据交叉编译标志设置变量 LV_SIMULATOR_ON_PC。如果正在交叉编译，则设置为 OFF；否则设置为 ON。

configure_file(
    "${PROJECT_SOURCE_DIR}/base/base_sdk_version.h.in"
    "${PROJECT_SOURCE_DIR}/base/base_sdk_version.h"
)
configure_file(
    "${PROJECT_SOURCE_DIR}/base/base_config.h.in"
    "${PROJECT_SOURCE_DIR}/base/base_config.h"
)

配置文件模板，用于生成编译时需要的头文件。

set(CMAKE_INSTALL_BINDIR ${CMAKE_INSTALL_PREFIX}/bin)
set(CMAKE_INSTALL_SBINDIR ${CMAKE_INSTALL_PREFIX}/sbin)
set(CMAKE_INSTALL_LIBDIR ${CMAKE_INSTALL_PREFIX}/lib)
set(CMAKE_INSTALL_INCLUDEDIR ${CMAKE_INSTALL_PREFIX}/include)
set(CMAKE_INSTALL_SYSCONFDIR ${CMAKE_INSTALL_PREFIX}/etc)
set(CMAKE_INSTALL_SHARESTATEDIR ${CMAKE_INSTALL_PREFIX}/com)
set(CMAKE_INSTALL_LOCALSTATEDIR ${CMAKE_INSTALL_PREFIX}/var)
set(CMAKE_INSTALL_INFODIR ${CMAKE_INSTALL_PREFIX}/info)
set(CMAKE_INSTALL_LOCALEDIR ${CMAKE_INSTALL_PREFIX}/locate)
set(CMAKE_INSTALL_MANDIR ${CMAKE_INSTALL_PREFIX}/man)
set(CMAKE_INSTALL_DOCDIR ${CMAKE_INSTALL_PREFIX}/doc)
set(CMAKE_INSTALL_RESDIR ${CMAKE_INSTALL_PREFIX})

设置安装目录的各个子目录。

include(PrepareInstall)

包含一个自定义的 CMake 模块，用于准备安装目录。

set(KIT_ROOT_DIR ${CMAKE_SOURCE_DIR})

设置变量 KIT_ROOT_DIR 的值为源代码目录。

add_subdirectory("base")
add_subdirectory("lib")
add_subdirectory("drivers")
add_subdirectory("framework")
add_subdirectory("sysapp")
add_subdirectory("app")

添加子目录，用于构建项目的各个模块。每个子目录都包含了相应的 CMakeLists.txt 文件。