[gecode-users] Gecode 4.0.0

[Filip Konvička]

Hi Vincent,

I agree.  Regarding LGPL - I should have said that it would make the 
Gecode package include LGPL code, which might be problematic for some.  
But it's still OK for many.  I was briefly looking at the Internet on 
Friday and I haven't seen a usable math library that is not LGPL.

Best,
Filip

> Hi Filip,
>
> I don't know smathlib, but as you said, it seems to be not maintained 
> anymore.
> Elisa is based on Gaol which is based on the IBM mathematical library, 
> so it also relies on
> another external library.
>
> I agree to not start a new implementation, it will be painfull. I 
> don't think that Gecode will
> become LGPL if it links with a LGPL library. But users should have the 
> choice to not embed such a dependency.
> I didn't find a mathematical library which fit all our needs (license, 
> multi platforms, small, reliable).
> So I see no choice but to use an external dependency which will be 
> LGPL. Up to now, I retained two possibilities which
> are MPFR or CRlibm. Maybe CRLibm is easier to build under windows than 
> MPFR? (I am not a Windows user so I have no feedback on this)
>
> I also think that a build-option should be used to decide if 
> transcendental constraints must be included. But we still have
> to provide a fully functional implementation of FloatVar, and to 
> achieve it, we must choose a library. I prefer a library
> which works on Linux and Windows. I think it's up to Gecode 
> maintainers to decide which choice has to be made, I will follow
> their conlusions. But in the meantime, I will continue to dig the 
> topic, so thank you very much for all your remarks and
> advices :) If a Windows user has ever used an exact mathematical 
> library, feel free to share your comments.
>
> Best,
> Vincent
>
> Filip Konvi?ka <filip.konvicka at logis.cz> a écrit :
>
>>> Maybe you can have a look at Gaol:
>>> http://sourceforge.net/projects/gaol/
>>>
>>> You can also write to the author Frederic Goualard to talk about the
>>> subject.
>>>
>>
>> One issue will probably be the license - both Gaol and MPFR are LGPL, 
>> so including them in a Gecode distribution would make that Gecode 
>> package also LGPL, I guess.  Again, if a user decides to build their 
>> own Gecode with this included, it's fine, so it's great to have the 
>> option.  But for a standard Gecode release my understanding was that 
>> the ideal license would be MIT-style.
>>
>> Best,
>> Filip
>>
>>
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>
>