1、简单示例

# CMake 最低版本号要求
cmake_minimum_required (VERSION 2.8)
# 项目信息
project (main)
# 查找当前目录下的所有源文件
# 并将名称保存到 DIR_SRCS 变量
aux_source_directory(. DIR_SRCS)
# 指定生成目标
add_executable(main ${DIR_SRCS})

2、多目录源文件
cmake_minimum_required(VERSION 3.5)
project (hello_cmake)
aux_source_directory(${PROJECT_SOURCE_DIR} DIR_MAIN_SRCS)
aux_source_directory(${PROJECT_SOURCE_DIR}/hello DIR_HELLO_SRCS)
aux_source_directory(${PROJECT_SOURCE_DIR}/world DIR_WORLD_SRCS)
add_executable(hello_cmake ${DIR_MAIN_SRCS} ${DIR_HELLO_SRCS} ${DIR_WORLD_SRCS})

3、多级CMakeLists

# 父目录下的CMakeLists.txt
cmake_minimum_required(VERSION 3.10.2)
project(test)

include_directories(sub)
add_subdirectory(sub output) 

add_executable(test main.cpp)
target_link_libraries(test sub)

# sub/CMakeLists.txt
cmake_minimum_required(VERSION 3.10.2)
project(sub)
add_library(sub test.cpp)