9.5.4重新colcon build错误

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错误日志：

tingbo@tingbo-i7:~/chapt9/fishbot_ws$ colcon build
Starting >>> micro_ros_msgs
Starting >>> fishbot_bringup
Starting >>> fishbot_description
Starting >>> ros_serail2wifi
Finished <<< fishbot_description [1.89s]                                                                    
Starting >>> ydlidar                                                                                     
Finished <<< fishbot_bringup [2.26s]                                                                     
Finished <<< micro_ros_msgs [4.25s]                                                                                     
Starting >>> micro_ros_agent
Finished <<< ros_serail2wifi [4.97s]                                                                                     
Finished <<< micro_ros_agent [1.27s]                                                            
--- stderr: ydlidar                                
In file included from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/serial.h:9,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/ydlidar_driver.h:54,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/CYdLidar.h:36,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/src/ydlidar_node.cpp:26:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h: In function ‘bool ydlidar::fileExists(std::string)’:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_ino’ [-Wmissing-field-initializers]
  240 |   struct stat info = {0};
      |                        ^
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_nlink’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_mode’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_uid’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_gid’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::__pad0’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_rdev’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_size’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_blksize’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_blocks’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_atim’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_mtim’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::st_ctim’ [-Wmissing-field-initializers]
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/v8stdint.h:240:24: warning: missing initializer for member ‘stat::__glibc_reserved’ [-Wmissing-field-initializers]
In file included from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/ydlidar_driver.h:56,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/CYdLidar.h:36,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/src/ydlidar_node.cpp:26:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/thread.h: In static member function ‘static Thread Thread::createThread(thread_proc_t, void*)’:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/thread.h:43:57: warning: cast between incompatible function types from ‘thread_proc_t’ {aka ‘long unsigned int (*)(void*)’} to ‘void* (*)(void*)’ [-Wcast-function-type]
   43 |     pthread_create((pthread_t *)&thread_._handle, NULL, (void *(*)(void *))proc,
      |                                                         ^~~~~~~~~~~~~~~~~~~~~~~
In file included from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/ydlidar_driver.h:58,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/CYdLidar.h:36,
                 from /home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/src/ydlidar_node.cpp:26:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/help_info.h: In function ‘bool ydlidar::isSupportMotorCtrl(int)’:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/sdk/include/help_info.h:414:8: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  414 |   bool ret = false;
      |        ^~~
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/src/ydlidar_node.cpp: In function ‘int main(int, char**)’:
/home/tingbo/chapt9/fishbot_ws/src/ydlidar_ros2/src/ydlidar_node.cpp:222:25: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<LaserPoint>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
  222 |       for (int i = 0; i < scan.points.size(); i++)
      |                       ~~^~~~~~~~~~~~~~~~~~~~
---
Finished <<< ydlidar [15.3s]

Summary: 6 packages finished [17.8s]
  1 package had stderr output: ydlidar