一个好的自行编程式的学习源：https://github.com/ttroy50/cmake-examples
把里面的
两个目录认真的学习一遍，最好自己能够动手跟着做一遍。
当目录中存在CMakeLists.txt，使用cmake命令即可完成makefile的构建，后使用make命令即可执行构建任务
最小CMakeLists.txt中应该包含以下信息
project (hello_headers)
add_executable(hello_cmake main.cpp)
| Variable | Info |
|---|---|
| CMAKE_SOURCE_DIR | The root source directory |
| CMAKE_CURRENT_SOURCE_DIR | The current source directory if using sub-projects and directories. |
| PROJECT_SOURCE_DIR | The source directory of the current cmake project. |
| CMAKE_BINARY_DIR | The root binary / build directory. This is the directory where you ran the cmake command. |
| CMAKE_CURRENT_BINARY_DIR | The build directory you are currently in. |
| PROJECT_BINARY_DIR | The build directory for the current project. |
设置include文件夹
target_include_directories(target
PRIVATE
${PROJECT_SOURCE_DIR}/include
)