https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105297
--- Comment #10 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #9)
> (In reply to Patrick Palka from comment #7)
> > (In reply to Jonathan Wakely from comment #6)
> > > Patrick, I suggest we go with Jakub's suggestion in comment 4, but PTAL.
> >
> > LGTM, it seems to be the simplest workaround. I also tried replacing the
> > NSDMI but that seems to prevent the ICE only for the reduced testcase in
> > comment #3.
>
> Note, the original reduced testcase didn't have the " S" part in there,
> i.e. used anonymous struct. Is that what matters for the NSDMI?
Interestingly that doesn't seem to make a difference. What seems to matter is
whether the constexpr function modifies the CONSTRUCTOR that it returns:
constexpr auto foo() {
struct S { int d; } t = {};
t.d = 0; // doesn't ICE if this line is commented out
return t;
}
template<int>
int bar() {
constexpr auto t = foo();
return 0;
}
