https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89161
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|10.0 |10.3.0, 11.2.0, 12.0
Last reconfirmed|2020-05-01 00:00:00 |2022-1-19
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
GCC 12 or 11 don't warn on the test case in comment #3 but reconfirming the
warning for the test case in comment #0 with GCC 12:
$ gcc -O2 -S -Wall -fdump-tree-strlen=/dev/stdout pr89161.c
;; Function main (main, funcdef_no=12, decl_uid=2421, cgraph_uid=13,
symbol_order=13) (executed once)
...
pr89161.c:7: sprintf: objsize = 3, fmtstr = ".%1u"
Directive 1 at offset 0: ".", length = 1
Result: 1, 1, 1, 1 (1, 1, 1, 1)
Directive 2 at offset 1: "%1u"
pr89161.c: In function ‘main’:
pr89161.c:7:24: warning: ‘%1u’ directive writing between 1 and 6 bytes into a
region of size 2 [-Wformat-overflow=]
7 | sprintf(buf, ".%1u", (10 * a[0]) / a[1]);
| ^~~
In function ‘print’,
inlined from ‘main’ at pr89161.c:17:5:
pr89161.c:7:22: note: directive argument in the range [0, 327670]
7 | sprintf(buf, ".%1u", (10 * a[0]) / a[1]);
| ^~~~~~
Result: 1, 6, 6, 6 (2, 7, 7, 7)
Directive 3 at offset 4: "", length = 1
pr89161.c:7:9: note: ‘sprintf’ output between 3 and 8 bytes into a destination
of size 3
7 | sprintf(buf, ".%1u", (10 * a[0]) / a[1]);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
