CMake有多个可执行文件会给我带来一个错误

我在cmake上遇到了一些问题:我在学校项目中使用cmake,有一个奖金部分,但我们必须为奖金部分编译另一个可执行文件,我尝试了以下方法:

cmake_minimum_required(VERSION 3.10)

project(philosophers)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_C_COMPILER /usr/bin/clang)
set(CMAKE_C_STANDARD 99)
set(CMAKE_C_FLAGS "-Wall -Wextra -Werror")
set(CMAKE_EXE_LINKER_FLAGS "-lpthread")

set(LIBFT ${CMAKE_CURRENT_SOURCE_DIR}/lib/libft42/libft.a)

add_custom_command(OUTPUT ${LIBFT}
                    COMMAND make
                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/lib/libft42)

link_libraries(philo_bonus ${LIBFT})
link_libraries(philo ${LIBFT})
aux_source_directory(src SRC)
aux_source_directory(src_bonus SRC_BONUS)

add_executable(philo ${SRC} ${LIBFT})
add_executable(philo_bonus ${SRC_BONUS} ${LIBFT})
target_include_directories(philo
                            PUBLIC inc
                            PUBLIC lib/libft42/inc)
target_include_directories(philo_bonus
                            PUBLIC inc_bonus
                            PUBLIC lib/libft42/inc)

我删除了include\u目录,并将其替换为target\u include\u目录,因为我希望我的两个项目具有单独的include,但当我尝试 cmake -Bbuild -H. ,它说:

CMake Error at CMakeLists.txt:23 (add_executable):
  Target "philo_bonus" links to itself.


CMake Error at CMakeLists.txt:22 (add_executable):
  Target "philo" links to itself.


CMake Error: Cannot determine link language for target "philo_bonus".
CMake Error: CMake can not determine linker language for target: philo_bonus
-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.

我不明白这里发生了什么,我在add\u可执行文件中没有做任何更改,在添加另一个之前,它工作得很好。