Build error

[johnbritto1]

root@vm:~/jail-shell# make
make -C jail-cmd all
make[1]: Entering directory '/root/jail-shell/jail-cmd'
cc -g -O2 -Werror -Wall -Wstrict-prototypes -fno-omit-frame-pointer -Wstrict-aliasing -c -o jail-cmd.o jail-cmd.c
In file included from /usr/include/string.h:495,
from jail-cmd.h:10,
from jail-cmd.c:5:
In function ‘strncpy’,
inlined from ‘cmd_init’ at jail-cmd.c:92:3:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ specified bound 32 equals destination size [-Werror=stringop-truncation]
106 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [: jail-cmd.o] Error 1
make[1]: Leaving directory '/root/jail-shell/jail-cmd'
make: *** [Makefile:14: JAIL_CMD] Error 2

root@vm:~/jail-shell# lsb_release -a
No LSB modules are available.
Distributor ID: Linuxmint
Description: Linux Mint 20
Release: 20
Codename: ulyana

[KHIT93]

I can confirm this also behaves the same on plain Ubuntu 20.04 LTS 64-bit
Switching the default gcc 9.3.0 to 8.4.0 og 10.2.0 gies a different error message
Ubuntu 18.04 does however compile it with no errors

ubuntu@gracious-loach:/usr/local/src/jail-shell$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.1 LTS
Release:	20.04
Codename:	focal