我只是想通过以下方式探索gdb的功能： https://www.youtube.com/watch?v=PorfLSr3DDI&t=212s
在尝试复制上面电影中的步骤时，我得到了稍微不同的输出：
我跑步时
gdb a.out
，我知道了：
GNU gdb (GDB) 8.2.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 5 user staff 160 May 8 22:46 .
This is free software: you are free to change and redistribute it.wxr-xr-x 1 user staff 8432 May 8 22:46 a.out
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.world.c
This GDB was configured as "x86_64-apple-darwin17.7.0".
Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
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Users-MBP:codecompre_tooltest user$
For help, type "help".ooltest user$
Type "apropos word" to search for commands related to "word"...
Reading symbols from a.out...
warning: dsym file UUID doesn't match the one in /Users/user/Documents/codecompre_tooltest/a.out
(no debugging symbols found)...done.
(gdb) start
Temporary breakpoint 1 at 0x100000f04
Starting program: /Users/user/Documents/codecompre_tooltest/a.out
[New Thread 0x1703 of process 1645]
[New Thread 0x1903 of process 1645]
[New Thread 0x1a03 of process 1645]
[3]+ Stopped gdb a.out
为什么会这样，我该如何解决？
注意：我已经按照以下步骤进行操作：