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Re: [Help-glpk] GLPK GUROBI wrapper

From: Matteo Salani
Subject: Re: [Help-glpk] GLPK GUROBI wrapper
Date: Thu, 24 Feb 2011 08:55:59 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101027 Thunderbird/3.0.10

Robbie, list members,

I did not want to raise this flame discussion about licenses...
I wrote this wrapper form myself and a couple of colleagues and found it useful.

To me, it doesn't seem to violate any license.
Anyway, if you think it does, please remove it from the list archives and forget about it.

all the best,

On 02/24/2011 12:14 AM, Robbie Morrison wrote:
Hello list, hello Matteo

Subject:      Re: [Help-glpk] GLPK GUROBI wrapper
From:         Andrew Makhorin
Date:         Wed, 23 Feb 2011 22:58:42 +0300

On Wed, 2011-02-23 at 20:30 +0100, glpk xypron wrote:
Hello Matteo,

running your code would violate the license of GLPK
because Gurobi is not licensed under a license
compatible to the Gnu Public License.

Please, observe that Andrew chose to publish GLPK
under GPL and not LGPL.

Best regards

It depends on how Gurobi (which is highly proprietary
software) is used within the wrapper assuming that the
wrapper itself is distributed under the GNU GPL or a
compatible license. I think that in this case Gurobi
can be considered as a plug-in, so the following
answers the question:
I read thru 'wrapper_gurobi.c' carefully:

It seems to me that the final paragraph in the GNU
GPLAndPlugins section applies, which means this
constitutes a "borderline case".  Moreover Matteo's
program could probably be re-written in a scripting
language to enforce any necessary separations.
Hence my initial thought is that Matteo's code is

Although not a legal consideration, I don't see
this single C file, released under the GPLv2, as
undermining GLPK in any way.  Or am I missing

If 'wrapper_gurobi.c' is deemed okay, then I will put
an entry for it in the GLPK wikibook.

Whatever the decision, I would like to record my
appreciation to Matteo for attempting to contribute
back to the GLPK ecosystem. Cheers!

Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
University email (redirected) : address@hidden
Webmail (preferred)           : address@hidden
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*Matteo Salani*
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6928 Manno-Lugano Switzerland
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