[Ipopt] suppress solver output

[Brad Bell]

On 11:59 AM, Hossein Haghighat wrote:
> Hello,
> I use Bonmin to solve a model. This solver uses Ipopt as the NLP solver. I
> want to suppress all the output message and need only the final results.
> I set the parameters as below:
>
> option bonmin_options "bonmin.algorithm B-BB  print_level 0 outlev 0 ";
>
> but this does not work.Does anybody know how this can be avoided?
>
> Thank you in advance.
>

I have also requested that there be an option to suppress all Ipopt 
output.  One used to be able to do so but that changed.

This change to the Ipopt API broke test routines that do not expect 
output from Ipopt. My solution has been to patch the Ipopt source with 
the following bash commands:

file="Ipopt/src/Algorithm/IpIpoptAlg.cpp"
comment="// Bradley M. Bell 2009-07-01: Suppress printing startup message"
if ! grep "$comment" $file > /dev/null
then
      sed -istamp $file -e \
      "s|\(.* bool.*[ _]message_printed *= *\)false;|$comment\n\/\/&\n\1 
true;|"
fi