+++ This bug was initially created as a clone of Bug #1741515 +++

This file should compile without warnings using -O2 -Wall, using GCC 9 (or later):

#include <string.h>
#include <utmp.h>
#include <utmpx.h>

void
write_utmp (struct utmp *p, const char *data)
{
  strncpy (p->ut_line, data, sizeof (p->ut_line));
  strncpy (p->ut_id, data, sizeof (p->ut_id));
  strncpy (p->ut_user, data, sizeof (p->ut_user));
  strncpy (p->ut_host, data, sizeof (p->ut_host));
}

void
write_utmpx (struct utmpx *p, const char *data)
{
  strncpy (p->ut_line, data, sizeof (p->ut_line));
  strncpy (p->ut_id, data, sizeof (p->ut_id));
  strncpy (p->ut_user, data, sizeof (p->ut_user));
  strncpy (p->ut_host, data, sizeof (p->ut_host));
}

Since the suppression of warnings in system headers is not effective here, I think we should backport the upstream fixes to support GCC Toolset 9 and later.