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From: "guojiufu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105297] [12 Regression] new modules 'xtreme' test cases 
 FAILs
Date: Thu, 21 Apr 2022 09:25:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105297

Jiu Fu Guo <guojiufu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |guojiufu at gcc dot gnu.org

--- Comment #11 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
(In reply to Patrick Palka from comment #10)
>=20
> Interestingly that doesn't seem to make a difference.  What seems to matt=
er
> is whether the constexpr function modifies the CONSTRUCTOR that it return=
s:
>=20
> constexpr auto foo() {
>   struct S { int d; } t =3D {};
>   t.d =3D 0; // doesn't ICE if this line is commented out
>   return t;
> }
>=20
> template<int>
> int bar() {
>   constexpr auto t =3D foo();
>   return 0;
> }

Right, it is weird. Some PRs on Xtreme-* failure (including ICE) were also
reported before. e.g. PR100052, PR101853, PR99910.  As commented in those P=
Rs,
these may be random failures, and changes in headers that could expose the =
ICE.
I'm also wondering if this may be an issue hidden inside somewhere (GC?).=