[Bug c/83688] Please check if buffers may overlap when copying strings

[bugzilla@poradnik-webmastera.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83688

--- Comment #1 from Daniel Fruzynski <bugzilla@poradnik-webmastera.com> ---
This also would allow to catch code which use sprintf to concatenate strings,
what is an undefined behavior (snippet from
https://linux.die.net/man/3/snprintf):

sprintf(buf, "%s some further text", buf);