execute_process

https://cmake.org/cmake/help/v3.0/command/execute_process.html

add_custom_command

https://zhuanlan.zhihu.com/p/95771200

add_custom_command(TARGET ${EXE1}
                   PRE_BUILD
                   COMMAND ${CMAKE_COMMAND} -E echo oj8k
                   VERBATIM
)

PRE_BUILD | POST_BUILD

FetchContent FetchContent

example:

FetchContent_Declare(
  googletest
  GIT_REPOSITORY https://github.com/google/googletest.git
  GIT_TAG        703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
)

FetchContent_Declare(
  <name>
  <contentOptions>...
  [EXCLUDE_FROM_ALL]
  [SYSTEM]
  [OVERRIDE_FIND_PACKAGE |
   FIND_PACKAGE_ARGS args...]
)

CMake cheatsheet

builtin variables

https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html

cmake-variables

https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html

include

Load and run CMake code from a file or module. https://cmake.org/cmake/help/latest/command/include.html

include(<file|module> [OPTIONAL] [RESULT_VARIABLE <var>]
                      [NO_POLICY_SCOPE])

source_group

定义了一个源文件的group，在IDE project生成时。生成源文件group时，有2种签名。

source_group(<name> [FILES <src>...] [REGULAR_EXPRESSION <regex>])

source_group ("${_target_folder}" FILES "${_file}")

os platform

Detect Microsoft Windows

if(WIN32)
    # for Windows operating system in general
endif()

Or:

if(MSVC OR MSYS OR MINGW)
    # for detecting Windows compilers
endif()

Detect Apple MacOS

if(APPLE)
    # for MacOS X or iOS, watchOS, tvOS (since 3.10.3)
endif()

Detect Unix and Linux

if(UNIX AND NOT APPLE)
    # for Linux, BSD, Solaris, Minix
endif()

dirs

${CMAKE_CURRENT_SOURCE_DIR} 貌似是 CMakeLists.txt 的文件夹

find_package

find_package(OpenCV)
MESSAGE("### opencv found: ${OpenCV_FOUND}")

target_link_libraries的库属性

https://blog.csdn.net/turbock/article/details/90034787

当创建动态库时，

如果源文件(例如CPP)中包含第三方头文件，但是头文件（例如hpp）中不包含该第三方文件头，采用PRIVATE。
如果源文件和头文件中都包含该第三方文件头，采用PUBLIC。
如果头文件中包含该第三方文件头，但是源文件(例如CPP)中不包含，采用 INTERFACE。

message

message([STATUS] "CMAKE_BINARY_DIR: " ${CMAKE_BINARY_DIR})

define output directory

SET(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)

target_link_libraries的属性

https://cmake.org/cmake/help/v3.0/command/target_link_libraries.html

https://blog.csdn.net/turbock/article/details/90034787

当创建动态库时，

如果源文件(例如CPP)中包含第三方头文件，但是头文件（例如hpp）中不包含该第三方文件头，采用PRIVATE。
如果源文件和头文件中都包含该第三方文件头，采用PUBLIC。
如果头文件中包含该第三方文件头，但是源文件(例如CPP)中不包含，采用 INTERFACE。

命令表

命令	含义	例子	文档	额外注释
add_executable	编译连接某些cpp 成为可执行文件	add_executable(Hello src/main.cpp src/foo.cpp) 来自例子1	add_executable( <name> [WIN32] [MACOSX_BUNDLE] [EXCLUDE_FROM_ALL] [source1] [source2 ...])	如果使用target_sources() 则cpp文件可省略
set	设置变量(正常、<br>高速缓存、环境变量)	SET(APP_NAME test)	set(<variable> <value>... [PARENT_SCOPE])	PARENT_SCOPE是<br>cmake的特殊机制
TARGET_LINK_LIBRARIES	明确编译目标的依赖库或gflags	target_link_libraries(Hello Foo) 来自例子6 TARGET_LINK_LIBRARIES(${APP_NAME} ${PROJECT_SOURCE_DIR}/Lib/libfswaplib.so ${OPENGL_LIBRARIES} ... )	target_link_libraries(<target> ... <item>... ...)	item可以的类型：1.库target 2.库完整路径 3.库简化名称 4.连接符号 5. 表达式
add_library	添加库作为target	[ADD_LIBRARY(${LIBRARY_NAME} SHARED ${include} ${include_api} ${include_seeta} ${src} ${utils})	add_library(<name> [STATIC / SHARED / MODULE] [EXCLUDE_FROM_ALL] source1 [source2 ...])](https://cmake.org/cmake/help/v3.0/command/add_library.html?highlight=add_library)	里面关于c系列动态库、静态库、module库描述相当简短准确
ADD_DEFINITIONS	编译过程添加define宏变量	ADD_DEFINITIONS(-DPROJ_PATH="${CMAKE_SOURCE_DIR}/")	add_definitions(-DFOO -DBAR ...)	类似make中的-D
FIND_PACKAGE	检查依赖软件（？用什么方法）	FIND_PACKAGE( Boost COMPONENTS filesystem system thread REQUIRED)	find_package(<PackageName> [version] [EXACT] [QUIET] [MODULE] [REQUIRED] COMPONENTS] [components... [OPTIONAL_COMPONENTS components...] <br> [NO_POLICY_SCOPE])	ni
INCLUDE_DIRECTORIES	添加包含文件路径	INCLUDE_DIRECTORIES( /usr/local/include ${OpenCV_INCLUDE_DIRS} ${PROJECT_SOURCE_DIR}/../caffe_deploy/include )	link	最终路径，插入等，还可以用target_include_directories()、set_property()等查看
link_directories	设置链接器等搜索路径	link_directories( /usr/lib ${OpenCV_LIB_DIR} )	link_directories(directory1 directory2 ...)	!大写的LINK_DIRECTORIES和link_directories并不相同，一个是只读，一个是设置
AUX_SOURCE_DIRECTORY	赋值出该目录下所有源文件	AUX_SOURCE_DIRECTORY(./include include) AUX_SOURCE_DIRECTORY(./include/c_api include_api)	aux_source_directory(<dir> <variable>)	ni
target_link_libraries	明确指出编译目标时链接的库与flags	TARGET_LINK_LIBRARIES(${LIBRARY_NAME} ${PROJECT_SOURCE_DIR}/../caffe_deploy/build/lib/libcaffe.so /usr/lib/x86_64-linux-gnu/libglut.so )	target_link_libraries(<target> [item1 [item2 [...]]][[debug/optimized/general] <item>] ...)	ni
add_subdirectory	在build目录中建立子文件夹	ADD_SUBDIRECTORY(main_tests)	add_subdirectory(source_dir [binary_dir] <br> [EXCLUDE_FROM_ALL])	ni
cmake_policy	恢复历史版本的cmake特性，以免除生成的bug
include		include(cmake/Dependencies.cmake)
FetchContent	获取三方库	FetchContent_Declare(pybind11\nGIT_PROGRESS TRUE \n GIT_SHALLOW TRUE \n GIT_REPOSITORY https://github.com/pybind/pybind11.git \n GIT_TAG v2.10.4 \n )	`FetchContent_Declare(<name><contentOptions>...[EXCLUDE_FROM_ALL][SYSTEM][OVERRIDE_FIND_PACKAGE)`

可能的宏定义

PROJECT_SOURCE_DIR

CMAKE_MODULE_PATH

all cpp as exe

macro(ncnn_add_example name)
    add_executable(${name} ${name}.cpp)
    target_include_directories(${name} PRIVATE ${OpenCV_INCLUDE_DIRS})
    target_link_libraries(${name} PRIVATE ncnn ${OpenCV_LIBS})

    # add test to a virtual project group
    set_property(TARGET ${name} PROPERTY FOLDER "examples")
endmacro()

find_package(OpenCV QUIET COMPONENTS opencv_world)
# for opencv 2.4 on ubuntu 16.04, there is no opencv_world but OpenCV_FOUND will be TRUE
if("${OpenCV_LIBS}" STREQUAL "")
    set(OpenCV_FOUND FALSE)
endif()
if(NOT OpenCV_FOUND)
    find_package(OpenCV QUIET COMPONENTS core highgui imgproc imgcodecs videoio)
endif()
if(NOT OpenCV_FOUND)
    find_package(OpenCV QUIET COMPONENTS core highgui imgproc)
endif()

if(OpenCV_FOUND)
    message(STATUS "OpenCV library: ${OpenCV_INSTALL_PATH}")
    message(STATUS "    version: ${OpenCV_VERSION}")
    message(STATUS "    libraries: ${OpenCV_LIBS}")
    message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
    
    if(${OpenCV_VERSION_MAJOR} GREATER 3)
        set(CMAKE_CXX_STANDARD 11)
    endif()
    include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../src)
    include_directories(${CMAKE_CURRENT_BINARY_DIR}/../src)

    ncnn_add_example(squeezenet)
    ncnn_add_example(squeezenet_c_api)
    ncnn_add_example(fasterrcnn)
    ncnn_add_example(rfcn)
    ncnn_add_example(yolov2)
    ncnn_add_example(yolov3)
    ncnn_add_example(yolov4)
    ncnn_add_example(mobilenetv2ssdlite)
    ncnn_add_example(mobilenetssd)
    ncnn_add_example(squeezenetssd)
    ncnn_add_example(shufflenetv2)
    ncnn_add_example(peleenetssd_seg)
    ncnn_add_example(simplepose)
    ncnn_add_example(retinaface)
    ncnn_add_example(yolact)
else()
    message(WARNING "OpenCV not found, examples won't be built")
endif()

CMake cheatsheet - Serbipunk/notes GitHub Wiki

execute_process

add_custom_command

FetchContent FetchContent

CMake cheatsheet

builtin variables

cmake-variables

include

source_group

os platform

dirs

find_package

target_link_libraries的库属性

message

define output directory

target_link_libraries的属性

命令表

可能的宏定义

all cpp as exe

⚠️ GitHub.com Fallback ⚠️

CMake cheatsheet - Serbipunk/notes GitHub Wiki

execute_process

add_custom_command

FetchContentFetchContent

CMake cheatsheet

builtin variables

cmake-variables

include

source_group

os platform

dirs

find_package

target_link_libraries的库属性

message

define output directory

target_link_libraries的属性

命令表

可能的宏定义

all cpp as exe

⚠️ **GitHub.com Fallback** ⚠️

FetchContent FetchContent

⚠️ GitHub.com Fallback ⚠️