https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61904
--- Comment #11 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Here's a small (auto-)reduced testcase for this specific issue:
markus@x4 ~ % cat fair.i
int a, b, d;
enum cpu_idle_type
{
CPU_MAX_IDLE_TYPES
};
struct sched_domain
{
int balance_interval;
int lb_count[0];
int lb_nobusyg[];
} c,*g ;
__typeof__(int[0]) f;
int *h;
static struct sched_domain *fn1 (int *p1, int *p2)
{
struct sched_domain *e;
int i;
for (; i = fn2 (i);)
{
e = &*(
{
__asm__("" : "=r"(d) : "0"(0));
(typeof(&c))0 + a;
});
fn3 ();
fn4 (i);
}
return e;
}
fn5 (int p1, struct sched_domain *p2, enum cpu_idle_type p3)
{
int *j = *(
{
long k;
asm volatile("" : "=r"(k) : ""(b), "0"(&f));
(typeof(*&f) *)k;
});
if (p3)
h = 0;
int l = *j;
p2->lb_count[p3]++;
redo:
p2->lb_nobusyg[p3]++;
g = fn1 (0, 0);
if (fn6 (j))
goto redo;
p2->balance_interval *= 2;
}
markus@x4 ~ % gcc -c -mcmodel=kernel -Os -fno-omit-frame-pointer
-fcompare-debug fair.i
gcc: error: fair.i: -fcompare-debug failure (length)
markus@x4 ~ % gcc -c -mcmodel=kernel -O2 -fno-omit-frame-pointer
-fcompare-debug fair.i
markus@x4 ~ %
