> > diff --git a/gcc/testsuite/gcc.dg/plugin/must-tail-call-1.c
> > b/gcc/testsuite/gcc.dg/plugin/must-tail-call-1.c
> > index 3a6d4cceaba7..44af361e2925 100644
> > --- a/gcc/testsuite/gcc.dg/plugin/must-tail-call-1.c
> > +++ b/gcc/testsuite/gcc.dg/plugin/must-tail-call-1.c
> > @@ -1,4 +1,5 @@
> > /* { dg-do compile { target tail_call } } */
> > +/* { dg-options "-O2" } */
>
> So I think this is unfortunate - I think when there's a must-tail attribute
> we should either run the tailcall pass to check the call even at -O0 or
> trust the user with correctness (hoping no optimization interfered with
> the ability to tail-call).
>
> What were the ICEs you ran into?
I just tried and I don't see ICEs with the current test cases anymore.
Unfortunately I didn't save the earlier ones and I'm not fully sure
what test case i used then. I'll undo that change and watch it.
Maybe together with moving the tree pass that's enough to fix -O0.
-Andi
