set() 在CmakeLists中可以设置变量，变量值类型是string
aux_source_directory(${PROJECT_SOURCE_DIR} SRC)
PROJECT_SOURCE_DIR：执行cmake时后面携带的路径 CMakeLists.txt对应的路径
file(GLOB SRC ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)
CMAKE_CURRENT_SOURCE_DIR执行cmake时后面携带的路径 CMakeLists.txt对应的路径
include_directories(${PROJECT_SOURCE_DIR}/include) 指定头文件的路径
include_directories(include)
动态库：libxxx.so SHARED 有可执行权限
静态库：libxxx.a STATIC
发布给客户需要给include 和库文件
如果使用的静态库， libcalc.a 可被打包到生成的可执行文件当中，动态库里面的数据不会打包到可执行文件里面，当程序一启动，可执行文件和静态库都会被加载到内存中，但是动态库不会，动态库只是执行到的时候才会被加载到内存中
target_link_libraries(app calc) 写到CmakeLists.txt最后，动态库在物理内存只保存一份
cmake_minimum_required(VERSION 3.15)
project(test)
set(LIBPATH &{PROJECT_SOURCE_DIR}/lib)
set(EXECPARH ${PROJECT_SOURCE_DIR}/bin)
set(HREADPATH ${PROJECT_SOURCE_DIR}/include)
set(CALCLIB calc)
set(SORTLIB sort)
set(APPNAME1 app1)
set(APPNAME2 app2)
#给当前节点添加子目录
add_subdirectory(calc)
add_subdirectory(sort)
add_subdirectory(test1)
add_subdirectory(test2)
cmake_minimum_required(VERSION 3.15)
project(calc)
#搜索源文件
aux_source_directory(./ SRC)
include_directories(${HREADPATH})
set(LIBRARY_OUTPUT_PATH ${LIBPATH})
add_library(${CALCLIB} STATIC ${SRC})
cmake_minimum_required(VERSION 3.15)
project(sort)
#搜索源文件
aux_source_directory(./ SRC)
include_directories(${HREADPATH})
set(LIBRARY_OUTPUT_PATH ${LIBPATH})
add_library(${SORTLIB} STATIC ${SRC})
cmake_minimum_required(VERSION 3.15)
project(test1)
#搜索源文件
aux_source_directory(./ SRC)
include_directories(${HREADPATH})
link_directories(${LIBPATH})
link_libraries(${CALCLIB})
set(EXECUTABLE_OUTPUT_PATH ${EXECPARH})
add_executable(${APPNAME1} ${SRC})
cmake_minimum_required(VERSION 3.15)
project(test1)
#搜索源文件
aux_source_directory(./ SRC)
include_directories(${HREADPATH})
set(SORTLIB sort)
link_directories(${LIBPATH})
link_libraries(${LIBSORT})
set(EXECUTABLE_OUTPUT_PATH ${EXECPARH})
add_executable(${APPNAME2} ${SRC})
