ICE on valid(?) with class arrays

[Andrew Benson <abenson at its dot caltech dot edu>]

I'm starting to experiment with using class arrays with gfortran 4.7.0 and 
think I've found an ICE related to class arrays.

I've created a reduce test case which I think (but don't claim to be 100% 
sure) is valid code:

module test
  private

  type :: componentB
  end type componentB
  
  type :: treeNode
     class(componentB), allocatable, dimension(:) :: componentB
  end type treeNode
  
contains
  
  function BGet(self)
    implicit none
    class(componentB), pointer :: BGet
    class(treeNode), intent(in) :: self
    select type (self)
    class is (treeNode)
       BGet => self%componentB(1)
    end select
    return
  end function BGet
  
end module test

$ gfortran -v
Using built-in specs.
COLLECT_GCC=/opt/gcc-4.7/bin/gfortran
COLLECT_LTO_WRAPPER=/opt/gcc-4.7/libexec/gcc/x86_64-unknown-linux-
gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.7/configure --prefix=/opt/gcc-4.7 --enable-
languages=c,c++,fortran --disable-multilib
Thread model: posix
gcc version 4.7.0 20120103 (experimental) (GCC)
$ gfortran -c test.F90 -o test.o
test.F90: In function âbgetâ:
test.F90:19:0: internal compiler error: in gfc_conv_descriptor_offset, at 
fortran/trans-array.c:210
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

If I remove the "allocatable" I instead get:

$ gfortran -c test.F90 -o test.o
f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


If I remove the "dimension(:)" and change the pointer association to:

       BGet => self%componentB

then it compiles successfully.

I don't see anything in bugzilla which seems related.

-Andrew

-- 

* Andrew Benson: http://www.tapir.caltech.edu/~abenson/contact.html

* Galacticus: http://sites.google.com/site/galacticusmodel