https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79221
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.0, 8.1.0, 9.2.0
Target Milestone|--- |8.4
Known to fail| |7.2.0
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Looks like this was resolved by r255755 (PR 78918). Both functions in the test
case in comment #0 are now diagnosed, by different warnings. That's not
unexpected but should at some point be changed to issue -Wstringop-overflow for
both.
$ gcc -O2 -S -Wall pr79221.c
pr79221.c: In function ‘f’:
pr79221.c:8:3: warning: ‘strcat’ writing between 7 and 9 bytes into a region of
size 3 overflows the destination [-Wstringop-overflow=]
8 | strcat (d, s);
| ^~~~~~~~~~~~~
pr79221.c: In function ‘gf’:
pr79221.c:15:3: warning: ‘__builtin_memcpy’ forming offset [3, 8] is out of the
bounds [0, 3] of object ‘d’ with type ‘char[3]’ [-Warray-bounds]
15 | strcat (d, s);
| ^~~~~~~~~~~~~
pr79221.c:3:6: note: ‘d’ declared here
3 | char d[3];
| ^
