https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77622
Sam James <sjames at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sjames at gcc dot gnu.org
Keywords| |needs-bisection
--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
The testcase works for me with 10..15.
$ gcc a.c -O2 -o a -U_FORTIFY_SOURCE && ./a
a.c: In function ‘main’:
a.c:3:3: warning: ‘__builtin___memcpy_chk’ writing 5 bytes into a region of
size 0 overflows the destination [-Wstringop-overflow=]
3 | __builtin___memcpy_chk (dest, src, n, bos (dest))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.c:23:5: note: in expansion of macro ‘memcpy’
23 | memcpy (p, "abcdef", 5);
| ^~~~~~
a.c:3:3: warning: ‘__builtin___memcpy_chk’ writing 5 bytes into a region of
size 0 overflows the destination [-Wstringop-overflow=]
3 | __builtin___memcpy_chk (dest, src, n, bos (dest))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.c:33:5: note: in expansion of macro ‘memcpy’
33 | memcpy (p, "abcdef", 5);
| ^~~~~~
0 0 0 0
*** buffer overflow detected ***: terminated
Aborted (core dumped) ./a
