https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85359
Bug ID: 85359
Summary: duplicate -Wstringop-overflow for a strcmp call with a
nonstring pointer
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC issues two warnings for a single call to strcmp in the following test case.
One warning is issued from expand_builtin_strcmp() in builtins.c and the other
from expand_call() in calls.c called directly from the former.
$ cat z.c && gcc -O2 -S -Wall z.c
int f (__attribute__ ((nonstring)) const char *d, const char *s)
{
return __builtin_strcmp (d, s);
}
z.c: In function ‘f’:
z.c:3:10: warning: ‘__builtin_strcmp’ argument 1 declared attribute ‘nonstring’
[-Wstringop-overflow=]
return __builtin_strcmp (d, s);
^~~~~~~~~~~~~~~~~~~~~~~
z.c:1:48: note: argument ‘d’ declared here
int f (__attribute__ ((nonstring)) const char *d, const char *s)
~~~~~~~~~~~~^
z.c:3:10: warning: ‘__builtin_strcmp’ argument 1 declared attribute ‘nonstring’
[-Wstringop-overflow=]
return __builtin_strcmp (d, s);
^~~~~~~~~~~~~~~~~~~~~~~
z.c:1:48: note: argument ‘d’ declared here
int f (__attribute__ ((nonstring)) const char *d, const char *s)
~~~~~~~~~~~~^
