[Bug tree-optimization/101451] Incorrect -Wstringop-truncation warning

["quentin at armitage dot org.uk" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101451

--- Comment #2 from Quentin Armitage <quentin at armitage dot org.uk> ---
Created attachment 51297
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51297&action=edit
ipvswrapper.i for strncpy truncated warning

The following warning is generated:

gcc -c -o ipvswrapper.o1 -O2 -Wstringop-truncation ipvswrapper.i
In file included from /usr/include/string.h:519,
                 from ../../lib/timer.h:28,
                 from ../../keepalived/include/vrrp.h:40,
                 from ../../keepalived/include/ipvswrapper.h:29,
                 from ipvswrapper.c:34:
In function ‘strncpy’,
    inlined from ‘ipvs_set_srule’ at ipvswrapper.c:494:7:
/usr/include/bits/string_fortified.h:95:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 15 bytes from a string of length 15
[-Wstringop-truncation]
   95 |   return __builtin___strncpy_chk (__dest, __src, __len,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   96 |                                   __glibc_objsize (__dest));
      |                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~