http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55759
--- Comment #4 from Markus Trippelsdorf <markus at trippelsdorf dot de>
2012-12-20 18:34:19 UTC ---
This is what creduce came up with:
markus@x4 /tmp % cat test.i
struct ata_taskfile
{
int feature;
};
struct ata_eh_info
{
int flags;
};
struct ata_eh_context
{
struct ata_eh_info i;
};
struct
{
struct ata_eh_context eh_context;
}
g, n;
int a, c, e, f, m, o;
void fn1 (char *, ...);
int fn2 ();
int fn3 ();
static int
fn4 (long long *p1)
{
struct ata_taskfile b;
if (a && b.feature)
return 1;
*p1 = fn3 ();
return 0;
}
static int
fn5 ()
{
struct ata_taskfile d;
if (c && d.feature)
return -13;
return 0;
}
static int
fn6 ()
{
struct ata_eh_context h = g.eh_context;
int i = h.i.flags, l;
_Bool j = f;
long long k;
l = fn4 (&k);
if (l)
return 0;
if (e || j)
return 0;
l = fn5 ();
if (l == -13)
return 0;
if (l)
return 1;
l = fn2 ();
if (l)
if (i)
fn1 ("HPA > %llu\n", k);
return 0;
}
int
fn7 ()
{
struct ata_eh_context p = n.eh_context;
int q = p.i.flags;
o = 0;
m = fn6 ();
goto err_out_nosup;
if (q)
err_out_nosup:
return 0;
}
markus@x4 /tmp % gcc -c -Wall -Os test.i
test.i: In function ‘fn7’:
test.i:61:17: warning: ‘k’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
fn1 ("HPA > %llu\n", k);
^
test.i:47:15: note: ‘k’ was declared here
long long k;
^
markus@x4 /tmp % gcc -c -Wall test.i
markus@x4 /tmp % gcc -c -Wall -O2 test.i
markus@x4 /tmp % /usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3/gcc -c -Wall -Os test.i
markus@x4 /tmp % /usr/x86_64-pc-linux-gnu/gcc-bin/4.7.2/gcc -c -Wall -Os test.i
test.i: In function ‘fn7’:
test.i:61:17: warning: ‘k’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
test.i:47:15: note: ‘k’ was declared here
markus@x4 /tmp % /usr/x86_64-pc-linux-gnu/gcc-bin/4.7.2/gcc -c -Wall -O2 test.i
markus@x4 /tmp %
