Re: make check segmentation fault

[John W. Eaton]

On 27-Dec-2007, Yan Wu wrote:

| 
| Thanks David, here is the result:
| 
| [New Thread 2305843009463104096 (LWP 9099)]
| Program received signal SIGSEGV, Segmentation fault.
| [Switching to Thread 2305843009269374240 (LWP 9096)]
| base_lu<Matrix, double, Matrix, double>::P (this=Variable "this" is not
| available.) at base-lu.cc:87
| 87      base-lu.cc: No such file or directory.
|         in base-lu.cc
| Current language:  auto; currently c++

So the crash is happening here (at the line marked with >>>):

  template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
  p_type
  base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: P (void) const
  {
    octave_idx_type a_nr = a_fact.rows ();

    Array<octave_idx_type> pvt (a_nr);

    for (octave_idx_type i = 0; i < a_nr; i++)
      pvt.xelem (i) = i;

    for (octave_idx_type i = 0; i < ipvt.length(); i++)
      {
        octave_idx_type k = ipvt.xelem (i);

        if (k != i)
          {
>>>         octave_idx_type tmp = pvt.xelem (k);
            pvt.xelem (k) = pvt.xelem (i);
            pvt.xelem (i) = tmp;
          }
      }


In your earlier message, I think you showed that you were compiling
with --enable-64.  I suspect that your blas/lapack library is not
compiled such that integers are 8 bytes wide.  Do you really need
--enable-64?  Do you understand that it is an experimental feature and
not fully implemented?

jwe