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HighsIO.cpp line 25-29 is also not thread safe - two solver running in parallel will mess up each others callbacks and in case both print messages at the same time...

I'm not sure what you're trying to do. This repository aka https://github.com/coin-or/Clp is not an R package so it is not suprising that it can't be installed. "install.packages" does not...

I'm not sure what you are trying to archive but it looks like a 'bad' idea (big-M with generic M is nearly always a bad idea). I suspect numerical issues...

That looks like a problem with preprocessing: ``` $ cbc clipping_demo_m1000_x28e-2.lp Welcome to the CBC MILP Solver Version: 2.10.5 Build Date: Apr 8 2020 command line - cbc clipping_demo_m1000_x28e-2.lp -solve...

I'm not able to run the tests inside visual studio, but we had some issues with older version of Cbc compiled with Visual Studio 2013 (using the *.vcxproj) as well...

thanks. Yes, the problem is scaled badly. I will have to fix the code that generateded this MIP, too.

Thanks for the explanation. If only less cuts but no invalid cuts are separated, the severity of this issue is reduced significantly. It might be an exotic use case but...

At work I'm in a similar situation to @christoph-cullmann : developing an application uses cmake and calls CBC as a library. Our solution is to call coinbrew from within cmake...