[Ipopt] redirection of stdout

[Sean Hardesty]

I have a curious issue with Ipopt. I am running on an Ubuntu 16.04 system,
using Ipopt 3.11.9, g++ 5.4, and linking against a bunch of other
libraries, including UMFPACK and CGAL. If I run

my_ipopt_program

it works fine, and I get the expected output, beginning with

******************************************************************************
This program contains Ipopt, a library for large-scale nonlinear
optimization.
 Ipopt is released as open source code under the Eclipse Public License
(EPL).
         For more information visit http://projects.coin-or.org/Ipopt
******************************************************************************

This is Ipopt version 3.11.9, running with linear solver mumps.
NOTE: Other linear solvers might be more efficient (see Ipopt
documentation).

If my program has called

app->Options()->SetStringValue("output_file", "ipopt.out");

then it also writes the output to ipopt.out. But if I redirect stdout, or
also stderr

my_ipopt_program > run.log
my_ipopt_program > run.log 2>&1

then Ipopt never prints anything to run.log, or to ipopt.out.

Is this behavior expected, a bug, or a problem I have somehow caused?

    Thanks,
    Sean Hardesty
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/ipopt/attachments/20180305/0f39bf86/attachment.html>