add_subdirectory(aws-iot-sdk-cpp)，添加AWS IoT C++ SDK路径，但是找不到

在使用add_subdirectory添加aws-iot-sdk-cpp子目录之前，需要确保该子目录的路径正确指定。可以使用以下方式来指定路径：

set(AWS_IOT_SDK_CPP_DIR /path/to/aws-iot-sdk-cpp)

接着，在使用add_subdirectory添加aws-iot-sdk-cpp子目录时，需要使用指定的路径：

add_subdirectory(${AWS_IOT_SDK_CPP_DIR})

如果在执行cmake时仍然找不到子目录，可以检查路径是否正确指定，并确保子目录中包含了CMakeLists.txt文件。另外，也可以在CMakeLists.txt文件中使用message命令来打印调试信息，以便更好地了解问题所在。

相关问题

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。

出现错误No build type selected, default to Release CMake Error at CMakeLists.txt:41 (add_subdirectory): The source directory /home/toybrick/OpenCL-SDK-main/external/OpenCL-Headers does not contain a CMakeLists.txt file. CMake Error at CMakeLists.txt:42 (add_subdirectory): The source directory /home/toybrick/OpenCL-SDK-main/external/OpenCL-ICD-Loader does not contain a CMakeLists.txt file. CMake Error at CMakeLists.txt:43 (add_subdirectory): The source directory

根据您提供的错误信息，似乎是在构建OpenCL SDK时找不到需要的CMakeLists.txt文件，可能是因为您的源代码不完整或文件路径不正确。

请确保您已经正确克隆了OpenCL SDK的完整源代码，并且在构建之前已经成功安装了必要的依赖项。另外，您需要确保您的当前工作目录是OpenCL SDK的根目录。

您可以尝试使用以下步骤来解决此问题：

1. 确保您已经克隆了完整的OpenCL SDK源代码：

   git clone https://github.com/KhronosGroup/OpenCL-SDK.git

2. 进入OpenCL SDK的根目录：

   cd OpenCL-SDK

3. 创建一个build目录，并进入该目录：

   mkdir build
   cd build

4. 运行cmake命令来生成构建文件：

   cmake ..

注意：请确保您的工作目录是在build目录下。

5. 接下来，在build目录下运行make命令来构建OpenCL SDK：

   make -j4

6. 如果构建成功，可以使用以下命令将OpenCL SDK安装到系统中：

   sudo make install

希望这些步骤能够帮助您解决问题并成功构建OpenCL SDK。