gfortran 4.1.2: "internal compiler error: Segmentation fault"

[Steve Kargl]

On Sat, Sep 30, 2006 at 11:14:39PM -0700, Rob wrote:
> 
> > On Fri, Sep 29, 2006 at 03:49:37PM -0700, Rob wrote:
> > >
> > >Hi,
> > >
> > >I have compile GCC 4.1.2 (prerelease) on an Alpha
> > >system with CentOS 4 (clone of Redhat Enterprise).
> > >
> > >The required file to reproduce this problem are
> > >here: http://surfion.snu.ac.kr/~lahaye/gcc/
> > 
> > Please reduce this to something that doesn't look
> > like parts of vasp ;)
> > I compiled (and ran) a current vasp.4.6 with
> > gfortran a while ago and it did work fine.
> > 
> > I can confirm that, however, it currently fails for
> > this reduced (and not vasp related) testcase:
> > 
> > $ cat no.f90 
> >         MODULE MOD1
> >         CONTAINS
> >         SUBROUTINE SUB1(arg)
> >         IMPLICIT NONE
> >         CHARACTER (LEN=*), OPTIONAL :: arg
> >         IF (PRESENT(arg)) WRITE(0,*) 'arg was ', arg
> >         STOP
> >         END SUBROUTINE SUB1
> >         SUBROUTINE SUB2
> >         CALL SUB1
> >         END SUBROUTINE SUB2
> >         END MODULE
> > $ gfortran-4.2-HEAD -c no.f90
> > no.f90: In function 'sub2':
> > no.f90:3: internal compiler error: Segmentation
> > fault
> 
> Yes, indeed I can now confirm this too.
> Moreover, if you replace
>   CALL SUB1
> by
>   CALL SUB1("")
> the segfault goes away.
> This way I can temporarily bypass this problem
> with gfortran.
> 
> Also, this is not in the trunk, but in the
> GCC 1.4.2 svn branch. In my case:
> 
>  $  gfortran --version
>  GNU Fortran 95 (GCC) 4.1.2 20061001 (prerelease)
> 
> Regards,
> Rob.

Can you submit a bug report in GCC's bugzilla so that
this doesn't get lost?

-- 
Steve