https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81172
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.0
Resolution|--- |FIXED
Blocks| |56456
Status|NEW |RESOLVED
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
For the slightly modified test case GCC 10 issues the expected warnings in the
expected cases (i.e., unless the code is removed as unused, etc.) So I think
this can be resolved as fixed. (There are plenty of other cases that still
aren't diagnosed; please open new bugs for those if they aren't already being
tracked under pr56456).
$ cat pr81172.c && gcc -O2 -S -Wall pr81172.c
int a[] = {1,2,3,4};
int* f (void)
{
int *p = a + 5;
return p;
}
const char s[] = "aaa", t[] = "bbbbb";
const char* g (void)
{
const char *p = s + __builtin_strlen (t);
return p;
}
const char* h (void)
{
return s + 'c';
}
pr81172.c: In function ‘f’:
pr81172.c:5:8: warning: array subscript 5 is outside array bounds of ‘int[4]’
[-Warray-bounds]
5 | int *p = a + 5;
| ^
pr81172.c:1:5: note: while referencing ‘a’
1 | int a[] = {1,2,3,4};
| ^
pr81172.c: In function ‘g’:
pr81172.c:13:15: warning: array subscript 5 is outside array bounds of ‘const
char[4]’ [-Warray-bounds]
13 | const char *p = s + __builtin_strlen (t);
| ^
pr81172.c:9:12: note: while referencing ‘s’
9 | const char s[] = "aaa", t[] = "bbbbb";
| ^
pr81172.c: In function ‘h’:
pr81172.c:19:12: warning: array subscript 99 is outside array bounds of ‘const
char[4]’ [-Warray-bounds]
19 | return s + 'c';
| ~~^~~~~
pr81172.c:9:12: note: while referencing ‘s’
9 | const char s[] = "aaa", t[] = "bbbbb";
| ^
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56456
[Bug 56456] [meta-bug] bogus/missing -Warray-bounds
