https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87757
Bug ID: 87757
Summary: weird underlining and colors in sprintf warnings for
unterminated arrays
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC produces slightly different output for the two equivalent calls to sprintf
below. The underlining for the second call looks wrong, as does its color:
it's green.
$ cat t.c && gcc -O2 -S -Wall t.c
const char a[] = { 'a' };
char *d, *e;
void f (void)
{
__builtin_sprintf (d, "%s", a);
__builtin_sprintf (e, "%s", &a[0]);
}
t.c: In function ‘f’:
t.c:7:26: warning: ‘%s’ directive argument is not a nul-terminated string
[-Wformat-overflow=]
7 | __builtin_sprintf (d, "%s", a);
| ^~ ~
t.c:1:12: note: referenced argument declared here
1 | const char a[] = { 'a' };
| ^
t.c:8:26: warning: ‘%s’ directive argument is not a nul-terminated string
[-Wformat-overflow=]
8 | __builtin_sprintf (e, "%s", &a[0]);
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
t.c:1:12: note: referenced argument declared here
1 | const char a[] = { 'a' };
| ^
