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int check_fa_work (const char *, const char *) __attribute__((noinline));
int check_fa_mid (const char *) __attribute__((noinline));
int check_fa (char *) __attribute__((noinline));
int how_much (void) __attribute__((noinline));
int check_fa_work (const char *c, const char *f)
{
const char d = 0;
if (c >= &d)
return c >= f && f >= &d;
else
return c <= f && f <= &d;
}
int check_fa_mid (const char *c)
{
const char *f = __builtin_frame_address (0);
/* Prevent a tail call to check_fa_work, eliding the current stack frame. */
return check_fa_work (c, f) != 0;
}
int check_fa (char *unused)
{
const char c = 0;
/* Prevent a tail call to check_fa_mid, eliding the current stack frame. */
return check_fa_mid (&c) != 0;
}
int how_much (void)
{
return 8;
}
int main (void)
{
char *unused = __builtin_alloca (how_much ());
if (!check_fa(unused))
abort();
return 0;
}
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