警告当当成错误 may be used uninitialized in this function [

如果是ubuntu20版本，或者gcc版本太高，可能有些警告会当成错误导致编译出错：
error: ‘’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
cc1plus: some warnings being treated as errors

确认gcc版本

gcc -v 1

gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)