[Octave-bug-tracker] [bug #58496] chol on Ubuntu 20.04 never returns

[Andreas Stahel]

URL:
  <https://savannah.gnu.org/bugs/?58496>

                 Summary: chol on Ubuntu 20.04 never returns
                 Project: GNU Octave
            Submitted by: sha1
            Submitted on: Thu 04 Jun 2020 12:16:58 PM CEST
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: None
             Assigned to: None
         Originator Name: Andreas Stahel
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

On a fresh Xubuntu 20.04 neither the dev nor 5.2.0 builds.

When creating the documentation  "make" launches jobs the never return. Have
to be killed with signal 9

To see the isolated problem
in doc/interpreter launching
sparseimages("./","spchol","eps") 
causes the problem, 
My attempt at locating the problem

elseif (strcmp (nm, "spchol"))
    n = 200;
    a = 10*speye (n) + sparse (1:n,ceil ([1:n]/2),1,n,n) + ...
        sparse (ceil ([1:n]/2),1:n,1,n,n);
    %% all smooth up to this point
    r1 = chol (a); %% the call to chol() never returns
    spy (r1);
    axis ("ij");
    print (outfile, d_typ);


Calling ./configure (or ./bootstra; ./configure) seemd to go through smooth. I
suspect a problem with libraries used.

Anybody a hint on how to fix the problem?
Enjoy the day

Andreas






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