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From: "xin.liu@compiler-dev.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/97920] [FINAL] -O2  segment fault due to extend derive
 type's member being partially allocated
Date: Wed, 16 Dec 2020 00:27:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97920

--- Comment #4 from xin liu <xin.liu@compiler-dev.com> ---
(In reply to Thomas Koenig from comment #3)
> Paul is correct, the state of the pointers is undefined.
>=20
> What you can do to correct this is to use
>=20
> module m
>   type t1
>     real, dimension(:), pointer :: a =3D> NULL()
>   contains
>     final :: t1f
>   end type
>=20
>   type, extends(t1) :: t2
>     real, dimension(:), pointer :: b =3D> NULL()
>   contains
>     final :: t2f
>   end type
>=20
> which will then run as expected.

OK,Thanks!=