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From: "neil.n.carlson at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/45794] New: internal compiler error: Segmentation fault
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D45794

           Summary: internal compiler error: Segmentation fault
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: neil.n.carlson@gmail.com


The following code causes an internal compiler error with the
current trunk:

$ gfortran --version
GNU Fortran (GCC) 4.6.0 20100924 (experimental)

subroutine foo (vector, mask)
  real :: vector(:)
  logical, optional :: mask(:)
  integer :: loc(1)
  if (present(mask)) then
    loc =3D maxloc(vector, mask)
  end if
end subroutine

$ gfortran -c bug3.f90=20
bug3.f90: In function =E2=80=98foo=E2=80=99:
bug3.f90:6:0: internal compiler error: Segmentation fault

Note that this bug does not exist in 4.4 (or 4.5 I think).