From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-414263-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 16955 invoked by alias); 5 Feb 2013 21:26:04 -0000
Received: (qmail 16658 invoked by uid 48); 5 Feb 2013 21:25:16 -0000
From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/55978] [4.8 Regression] class_optional_2.f90 -Os fails
Date: Tue, 05 Feb 2013 21:26:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: janus at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P4
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.8.0
X-Bugzilla-Changed-Fields:
Message-ID: <bug-55978-4-eZbhUbeDXh@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-55978-4@http.gcc.gnu.org/bugzilla/>
References: <bug-55978-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2013-02/txt/msg00428.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55978

--- Comment #12 from janus at gcc dot gnu.org 2013-02-05 21:25:09 UTC ---
Here is a further reduced test case, based on comment 1 and 3 (which are
basically identical):


program main
  implicit none

  integer, pointer :: y(:)

  y => null()
  call a4t2(y)

contains

 subroutine a4t2(x)
   integer, intent(in) :: x(4)
 end subroutine

end


It yields valgrind errors with all gfortran versions I tried (trunk, 4.7, 4.6
and 4.3):

==5664== Conditional jump or move depends on uninitialised value(s)
==5664==    at 0x4F25F05: _gfortran_internal_pack (in_pack_generic.c:53)
==5664==    by 0x40076E: MAIN__ (in /home/jweil/GSoC/PRs/55978/a.out)
==5664==    by 0x4007CA: main (in /home/jweil/GSoC/PRs/55978/a.out)


So it seems this is not an actual regression?!? class_optional_2.f90 was
introduced only in 4.8, and possibly r195125 only uncovered an existing bug
(e.g. by adding a call to  _gfortran_internal_pack).