[Bug tree-optimization/103226] [12 Regression] Recent change to copy-headers causes execution failure for gcc.dg/torture/pr80974

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103226

--- Comment #16 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #15)
> Re: c#13.  You were so close :-)  Add "-msim" to your command line.  THat's
> one of the things the baseboards file does for you when you run things under
> dejagnu on bfin-elf... 
> 
> I've sent Aldy instructions to access an AWS instance I've set up for
> debugging.

Oh, that's funny.  I just logged into the AWS instance only to notice that your
instructions contained -msim.

I can now run a hello world on my cross build, but still cannot reproduce the
problem:

tor:~/bld/bfin/install/bin$ cat a.c
main(){printf("hello world\n"); }
tor:~/bld/bfin/install/bin$ ./bfin-elf-gcc a.c  -w -msim -O2
tor:~/bld/bfin/install/bin$ ./bfin-elf-run ./a.out
hello world
tor:~/bld/bfin/install/bin$ cat j.c
/* { dg-do run } */

int a, b, c, d, e, f, g[4];

static int fn1 ()
{
  int h, i;
  if (b)
    goto L1;
L2:;
   int m = a;
   while (1)
     {
       int n = 2;
       e = !f && (n = 5);
       if (e)
         for (h = 0; h < 9; h++)
           for (i = 0; i < 6; i++)
             if (a)
               g[h] = 4;
       if (d)
         goto L2;
       a & n || b;
L1:
       if (a)
         L3:
             c = m;
       if (a)
         goto L3;
       if (b < 5)
         return 0;
     }
}

int main ()
{
  fn1 ();
  return 0; 
}
tor:~/bld/bfin/install/bin$ ./bfin-elf-gcc j.c  -w -msim -O2
tor:~/bld/bfin/install/bin$ ./bfin-elf-run ./a.out
tor:~/bld/bfin/install/bin$ 

However, I can reproduce on the AWS instance:

[root@ip-172 gcc]# bfin-elf-gcc -msim -O2 j.c
[root@ip-172 gcc]# bfin-elf-run a.out
[long wait]

Strange.