https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100190
Bug ID: 100190
Summary: warning on s390x: writing 1 byte into a region of size
0 [-Wstringop-overflow=]
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: f4bug at amsat dot org
Target Milestone: ---
Using GCC 11.0.0 20210210 (Red Hat 11.0.0-0) on s390x host,
the following code [*] ...:
22 static inline void *memset(void *s, int c, size_t n)
23 {
24 size_t i;
25 unsigned char *p = s;
26
27 for (i = 0; i < n; i++) {
28 p[i] = c;
29 }
30
31 return s;
32 }
... generates the following warning:
$ make -C pc-bios/s390-ccw
CCAS start.o
CC main.o
In file included from pc-bios/s390-ccw/main.c:11:
In function ‘memset’,
inlined from ‘boot_setup’ at pc-bios/s390-ccw/main.c:185:5,
inlined from ‘main’ at pc-bios/s390-ccw/main.c:288:5:
pc-bios/s390-ccw/libc.h:28:14: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
28 | p[i] = c;
| ~~~~~^~~
[*]
https://gitlab.com/qemu-project/qemu/-/blob/master/pc-bios/s390-ccw/libc.h#L22
