[Coin-ipopt] Ipopt C++ 3.0.0 print_level options

[Xie Wei]

Hi, Andreas:

I am incorporating Ipopt in a branch-and-bound framework and wish to
suppress any output to the screen from IPOPT, so as not to mess up with the
iteration info from the branch-and-bound. Now, the question is that: what
option should I use? I check the manual of C++, and it suggests me to set
print_level to 0. However, even after doing so, the code still has a lot of
printouts, namely, problem statistics, iterational information, and post
solution statistics. I am wondering if IPOPT provides any convenient way, or
I have to hack the source code.

Thanks,

Wei
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