I am having some difficulty with ORBit2-cpp 1.3.5 and ORBit2 2.6.0 under
RedHat Linux 8.0 using GARNOME to build GNOME 2.2. I am trying to define
some two dimensional matrices. Using this code in beserk.idl:

typedef sequence<sequence<double> > CoeffMat;

Results in:
[owe043@phi bol]$ orbit-idl-2 -l cpp beserk.idl
orbit-idl-2 2.6.0 compiling
  mode, show preprocessor errors, passes: stubs skels common headers
skel_impl imodule
 
 
** ERROR **: file IDLSequence.cc: line 401 (virtual std::string
IDLSequence::get_c_member_typename(const IDLTypedef*) const): assertion
failed: (active_typedef)aborting...
Trace/breakpoint trap (core dumped)

If I use the following code:

typedef double Real;
                                                                          
     typedef sequence<Real> CoeffSeq;
typedef sequence<CoeffSeq> CoeffMat;

Results in:

[owe043@phi bol]$ orbit-idl-2 -l cpp beserk.idl
orbit-idl-2 2.6.0 compiling
  mode, show preprocessor errors, passes: stubs skels common headers
skel_impl imodule
 
Segmentation fault (core dumped)

If I use the following code:

module beserk {
interface Variable { };
typedef sequence<Variable> VarSeq;
typedef sequence<VarSeq> VarMat;
};

The idl compiler consumes as much memory as it can a hold of. It probably
then crashes, but I have always had to kill it first. 

The idl compiler, using the C backend, handles all the different tests.