https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85788
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-15
Ever confirmed|0 |1
Known to fail| |7.3.0, 8.1.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed at -O2 with GCC 8.1 but only at -O3 on trunk where the warning sees:
n ()
{
int * c;
int b.2_13;
int b.2_16;
int pretmp_25;
int pretmp_26;
int _28;
int _31;
long unsigned int _33;
<bb 2> [local count: 1073741826]:
c_3 = d;
if (c_3 != 0B)
goto <bb 4>; [89.00%]
else
goto <bb 3>; [11.00%]
<bb 3> [local count: 1073741817]:
pretmp_25 = m.g;
pretmp_26 = m.h;
_28 = pretmp_25 / 8;
_31 = pretmp_26 * _28;
_33 = (long unsigned int) _31;
b.2_16 = b;
__builtin___memset_chk (&m.i, b.2_16, _33, 64000); [tail call]
return;
<bb 4> [local count: 955630226]:
c_4 = e;
if (c_4 != 0B)
goto <bb 6>; [89.00%]
else
goto <bb 5>; [11.00%]
<bb 5> [local count: 955630226]:
MEM[(int *)&m] = 140733193420799;
b.2_13 = b;
__builtin___memset_chk (&m.i, b.2_13, 134180865, 64000);
goto <bb 7>; [100.00%]
<bb 6> [local count: 7731917263]:
goto <bb 6>; [100.00%]
<bb 7> [local count: 8687547448]:
goto <bb 7>; [100.00%]
}
In function ‘a’,
inlined from ‘make_str_raster.constprop’ at t.c:17:3,
inlined from ‘n’ at t.c:22:12:
t.c:5:3: warning: ‘__builtin___memset_chk’ writing 134180865 bytes into a
region of size 64000 overflows the destination [-Wstringop-overflow=]
__builtin___memset_chk(k, b, l, f);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
