https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92307
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Target Milestone|--- |10.0
Known to fail| |8.3.0, 9.2.0
Known to work| |10.0
Resolution|--- |FIXED
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in GCC 10 via r279248 which now prints:
pr92307.c: In function ‘f’:
pr92307.c:2:3: warning: writing 2 bytes into a region of size 1
[-Wstringop-overflow=]
2 | __builtin_memcpy (d, s, n)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
pr92307.c:10:3: note: in expansion of macro ‘memcpy’
10 | memcpy (p, s, 2); // writing before the beginning of a
| ^~~~~~
pr92307.c:4:6: note: at offset 0 to object ‘a’ with size 2 declared here
4 | char a[2];
| ^
pr92307.c: In function ‘g’:
pr92307.c:2:3: warning: writing 2 bytes into a region of size 0
[-Wstringop-overflow=]
2 | __builtin_memcpy (d, s, n)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
pr92307.c:17:3: note: in expansion of macro ‘memcpy’
17 | memcpy (p, s, 2); // writing past the end of a
| ^~~~~~
pr92307.c:4:6: note: at offset 0 to object ‘a’ with size 2 declared here
4 | char a[2];
| ^
