From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id C6EAF38708DF; Mon, 28 Dec 2020 08:46:52 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C6EAF38708DF
From: "mscfd at gmx dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/98454] Apparent wrong initialization in function result
Date: Mon, 28 Dec 2020 08:46:52 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 9.3.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: mscfd at gmx dot net
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P4
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cc
Message-ID: <bug-98454-4-nMMAQXiKK8@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-98454-4@http.gcc.gnu.org/bugzilla/>
References: <bug-98454-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 28 Dec 2020 08:46:52 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98454

martin <mscfd at gmx dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mscfd at gmx dot net

--- Comment #9 from martin <mscfd at gmx dot net> ---
Problems with default initialisation of function result were fixed with
PR45489. The relevant testcase added by this PR is initialization_27.f90 wh=
ich
looks very similar to the reported problem (minus the non-initialised
components).

After playing around a little bit I think the reason why initialization_27.=
f90
does not fail in contrast to the reported case (with only unit=3D-1 as comp=
onent
so as to get valid fortran) is that it has a pointer component. Change t_te=
st
to something like

type :: t_test
  integer :: unit =3D -1
  integer, pointer :: p =3D> null()
end type

and unit gets properly initialised. Without the pointer component I get bog=
us
results.=