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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/106955] [13 Regression] '-fcompare-debug' failure w/
 -std=c++20 -O1 -ftree-parallelize-loops=2 -fno-ipa-sra --param
 ggc-min-expand=55
Date: Tue, 20 Sep 2022 10:26:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106955

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #2)
> (In reply to Arseny Solokha from comment #1)
> > Created attachment 53589 [details]
> > Reduced preprocessed testcase
> >=20
> > Unfortunately a 173K file is the best I could come up with after three =
days
> > of reduction, though it fails the check w/ just -std=3Dc++20 -O1
> > -fcompare-debug -ftree-parallelize-loops=3D2.
>=20
> Can't compile this due to:
>=20
> g++ pr106955.c -std=3Dc++20 -O1 -fcompare-debug -ftree-parallelize-loops=
=3D2 -c
> : In instantiation of =E2=80=98struct __gnu_cxx::__normal_iterator<int, i=
nt>=E2=80=99:
> :822:5:   required from here
> :793:44: error: =E2=80=98__gnu_cxx::__normal_iterator<int, int>::__traits=
_type=E2=80=99 {aka
> =E2=80=98int=E2=80=99} is not a class, struct, or union type

This is a nonsense reduction.=