[Bug fortran/35873] New: problem with gfortran -malign-double

[Bug fortran/35873] New: problem with gfortran -malign-double

[hjj at ifk dot sdu dot dk]

--> discovered error with gcc 4.2.1
--> fetched newest gcc binary (4.4.0): error persists
--> my system: openSuse 10.3 Linux i686 (Pentium 4)
--> gcc -malign-double test.f; a.out # ERROR: Segmentation violation
--> gcc test.f; a.out # OK

--> test.f:
      program test
      character*20 wrkmem
      call getenv("WRKMEM",wrkmem)
      write (0,*)   wrkmem
      read (wrkmem, '(I20)', err=10) lmwrkmem
      write (0,*) lmwrkmem
      stop
   10 continue
      write (0,*) 'err'
      end


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           Summary: problem with gfortran -malign-double
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjj at ifk dot sdu dot dk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35873

[Bug fortran/35873] problem with gfortran -malign-double

[hjj at ifk dot sdu dot dk]

------- Comment #1 from hjj at ifk dot sdu dot dk  2008-04-08 16:47 -------
(In reply to comment #0)
> --> gfortran -malign-double test.f; a.out # ERROR: Segmentation violation
> --> gfortran test.f; a.out # OK

Fix of typo (gcc instead of gfortran)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35873

[Bug fortran/35873] problem with gfortran -malign-double

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2008-04-08 16:51 -------
This is not a bug, -malign-double changes the ABI.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35873

[Bug fortran/35873] problem with gfortran -malign-double

[hjj at ifk dot sdu dot dk]

------- Comment #3 from hjj at ifk dot sdu dot dk  2008-04-08 18:50 -------
I don't understand how you can call it not a bug when a flag (no matter that it
changes the ABI) makes valid fortran code not work ????

It did work under earlier versions of gfotran.


-- 

hjj at ifk dot sdu dot dk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35873

[Bug fortran/35873] problem with gfortran -malign-double

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2008-04-08 18:54 -------
(In reply to comment #3)
> I don't understand how you can call it not a bug when a flag (no matter that it
> changes the ABI) makes valid fortran code not work ????

You have to compile all of libgfortran with -malign-double and all of libc with
it too.

Please read the documentation more closely since it explicitly says it breaks
compatibility.

See PR 29562, PR 30594, PR 31696 also.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35873

[Bug fortran/35873] problem with gfortran -malign-double

[jvdelisle at gcc dot gnu dot org]

------- Comment #5 from jvdelisle at gcc dot gnu dot org  2008-04-09 00:35 -------
If you can separate the I/O functions you need into a separate file and use
-malign-double only for those portions that do computations, you can make this
work.  I can not know from where I sit how important -malign-double is to your
application.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35873