[Bug fortran/54141] New: The optimizer -O produces a bug.

[alain.hebert at polymtl dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54141

             Bug #: 54141
           Summary: The optimizer -O produces a bug.
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: alain.hebert@polymtl.ca


Created attachment 27907
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27907
untar with tar xvfzp bug.tgz

The use of "-O" produces a bug. I was able to reproduce the bug on a simple
test case. Removing "-O" makes everything OK, but CPU times on our software are
3 time bigger. Removing "-O" is therefore not acceptable to us. The bug was
observed on Darwin, (mac os 10.8), but all our UBUNTU users have the same
problem. Here is the faulty output from our test case:

Alains-MacBook-Pro:bugdir alainhebert$ ./readme 
Darwin x86_64
GNU Fortran (GCC) 4.8.0 20120722 (experimental)
Copyright (C) 2012 Free Software Foundation, Inc.

GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
You may redistribute copies of GNU Fortran
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING

 IPLIST=   504939689
 IBASE(ILLIST)=           0
 ***bug***

To execute, simply type
./readme