cmake 递归依赖

现在有3个模块：main、service、base，main依赖service的service.h、service依赖base的base.h，怎么写CMakeList.txt避免main直接耦合base

- main

- service

- base

base模块

- base.h

- base.cpp

- CMakeLists.txt

 //base/base.h

 #ifndef BASE_H
 #define BASE_H

 void hello_base();

 #endif //BASE_H

 //base/base.cpp

 #include "base.h"
 #include <stdio.h>

 void hello_base()
 {
     printf("hello base\n");
 }

 #base/CMakeLists.txt

 cmake_minimum_required(VERSION 3.12)

 set(HEADER_LIST base.h)
 set(SOURCE_LIST base.cpp)

 file(COPY ${HEADER_LIST} DESTINATION  ".")

 add_library(base ${HEADER_LIST} ${SOURCE_LIST})

• file(COPY ${HEADER_LIST} DESTINATION  ".")

主要是为了把头文件做为一个编译输出，方便下面的使用

service 模块

- service.h

- service.cpp

- CMakeLists.txt

 //service/service.h

 #ifndef SERVICE_H
 #define SERVICE_H 
 #include "base.h" //用来测试main模块是否能找到base.h，正常尽量在源文件内包含头文件

 void hello_service();

 #endif //SERVICE_H

 //service/service.cpp

 #include "service.h"
 #include <stdio.h>

 void hello_service()
 {
     printf("hello service\n");
     hello_base();
 }

 #service/CMakeLists.txt

 cmake_minimum_required(VERSION 3.12)

 set(SOURCE_LIST service.cpp)
 set(HEADER_LIST service.h)

 add_subdirectory(${CMAKE_SOURCE_DIR}/../base base.output)
 include_directories(base.output)

 file(COPY ${HEADER_LIST} DESTINATION  ".")

 add_library(service ${HEADER_LIST} ${SOURCE_LIST})

 add_dependencies(service base)
 target_link_libraries(service base)

• add_subdirectory(${CMAKE_SOURCE_DIR}/../base base.output)

将base模块的输出base.h、libbase.a放到当前目录的base.output下

main 模块

- main.cpp

- CMakeLists.txt

 //main/main.cpp

 #include "service.h"

 int main(int argc, const char* argv[])
 {
     hello_service();
     return ;
 }

 #main/CMakeLists.txt

 cmake_minimum_required(VERSION 3.12)

 project(main)
 set(SOURCE_LIST main.cpp)

 add_subdirectory(${CMAKE_SOURCE_DIR}/../service service.output)

 file(GLOB_RECURSE INC_PATH *.h)
 foreach(DIR ${INC_PATH})
     STRING(REGEX REPLACE "/[a-z,A-Z,0-9,_,.]+$" "" dirName ${DIR})
     include_directories(${dirName})
 endforeach()

 add_executable(main ${SOURCE_LIST} ${HEADER_LIST})

 add_dependencies(main service)
 target_link_libraries(main service)

• add_subdirectory(${CMAKE_SOURCE_DIR}/../service service.output)

将service的输出放到service.output，而base的输出自动到了service.output/base.output下

• foreach(DIR ${INC_PATH}) .....

遍历所有包含头文件的目录（output目录）添加到main的依赖里，暂时没有想到更好的方法

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