https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109995
Bug ID: 109995
Summary: Bogus warning about __builtin_memset, from
-Wstringop-overflow
Product: gcc
Version: 13.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bruno at clisp dot org
Target Milestone: ---
Created attachment 55171
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55171&action=edit
test case bar.c
In the attached program, -Wall produces a warning "warning: ‘__builtin_memset’
specified bound 18446744073709551614 exceeds maximum object size
9223372036854775807 [-Wstringop-overflow=]", in a function that does not invoke
'memset' nor '__builtin_memset'.
With gcc 10.4.0:
$ gcc -O2 -Wall -S bar.c
In function ‘memset_small’,
inlined from ‘wrap’ at bar.c:242:1:
bar.c:249:17: warning: ‘__builtin_memset’ specified bound 18446744073709551614
exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
249 | do *++p = c; while (--n > 0);
| ~~~~~^~~
With gcc 11.3.0, 12.3.0, 13.1.0:
$ gcc -O2 -Wall -S bar.c
In function ‘memset_small’,
inlined from ‘memset_small’ at bar.c:242:1,
inlined from ‘wrap’ at bar.c:590:19:
bar.c:249:17: warning: ‘__builtin_memset’ specified bound 18446744073709551614
exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
249 | do *++p = c; while (--n > 0);
| ~~~~~^~~
