CMakeList中实现编译完成后自动拷贝指定文件到指定目录copy

# 说明
CMakeList管理的项目，指定编译完成后，将生成的某文件拷贝到指定目录下

# 实现
```bash
add_executable(my_target source.cpp)

# 编译完成后自动拷贝可执行文件
add_custom_command(TARGET my_target POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy
        $<TARGET_FILE:my_target>
        ${CMAKE_CURRENT_SOURCE_DIR}/output_directory/
)

# 编译完成后自动拷贝多个文件ui_inputDialog.h、ui_inputDialog2.h到output_directory目录
add_custom_command(TARGET my_target POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different
        ${CMAKE_CURRENT_SOURCE_DIR}/${PROJECT_NAME}_autogen/include/ui_inputDialog.h
		${CMAKE_CURRENT_SOURCE_DIR}/${PROJECT_NAME}_autogen/include/ui_inputDialog2.h
        ${CMAKE_CURRENT_SOURCE_DIR}/output_directory/
)

# 在构建时拷贝文件
add_custom_target(copy_files ALL
    COMMAND ${CMAKE_COMMAND} -E copy
        ${CMAKE_CURRENT_BINARY_DIR}/generated_file
        ${CMAKE_CURRENT_SOURCE_DIR}/destination_directory/
    DEPENDS generated_file
)

# 安装文件到指定目录（在执行make install时生效）
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/generated_file
    DESTINATION /path/to/install/directory
)
```

编辑：myhappyandy