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 2A53B385801D; Wed, 28 Oct 2020 20:27:06 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2A53B385801D
From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/30802] out of bounds error array I/O not picked up with
 -fbounds-check
Date: Wed, 28 Oct 2020 20:27:05 +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: 4.1.1
X-Bugzilla-Keywords: diagnostic
X-Bugzilla-Severity: normal
X-Bugzilla-Who: anlauf at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cc see_also
Message-ID: <bug-30802-4-WlypZHF7pj@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-30802-4@http.gcc.gnu.org/bugzilla/>
References: <bug-30802-4@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: Wed, 28 Oct 2020 20:27:06 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D30802

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |anlauf at gcc dot gnu.org
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D97039

--- Comment #9 from anlauf at gcc dot gnu.org ---
(In reply to markeggleston from comment #8)
> Changing to allocated arrays and bounds checking does not work at compile
> time but does at runtime:
>=20
> program test
> real, allocatable :: x(:)
> allocate(x(10))
> x =3D 0.0
> print *, x(0)
> deallocate(x)
> end program test
>=20
> $ gfortran -fbounds-check pr30802.f90
> $ ./a.out
>=20
> At line 5 of file pr30802.f90
> Fortran runtime error: Index '0' of dimension 1 of array 'x' below lower
> bound of 1
>=20
> Error termination. Backtrace:
> #0  0x400ea1 in ???
> #1  0x400f6d in ???
> #2  0x4380b2 in ???
> #3  0x438471 in ???
> #4  0x400c69 in ???

I think the point is that bounds-checking does not work for sections of ran=
k-2
arrays.  See also PR97039.

This is not I/O specific, but what Thomas said in comment#3.=