[Haskell-cafe] ANNOUNCE: tie-knot library

[Greg Fitzgerald]

> GHC's reliance on the LGPLed GMP library
...
> use integer-simple in your GHC

I think this can still use some attention.  GHC requires an integer library
internally, so to switch to integer-simple, you need to build GHC from
source.  Has anyone reviewed of the performance implications of this switch?

+the new GHC Performance Team, Johan and Bryan

Thanks,
Greg



On Fri, Dec 14, 2012 at 4:21 AM, Niklas Larsson <metaniklas at gmail.com>wrote:

>  Yes, if you link statically, if you want to distribute without giving
> away source (or relinkable object files) you can link dynamically or use
> integer-simple in your GHC.
>
> Niklas
>  ------------------------------
> Från: Herbert Valerio Riedel <hvr at gnu.org>
> Skickat: 2012-12-14 11:55
> Till: Brandon Allbery <allbery.b at gmail.com>
> Kopia: Ramana Kumar <Ramana.Kumar at cl.cam.ac.uk>; haskell-cafe<haskell-cafe at haskell.org>
> Ämne: Re: [Haskell-cafe] ANNOUNCE: tie-knot library
>
> Brandon Allbery <allbery.b at gmail.com> writes:
>
> > Haskell libraries are mostly BSD licensed, as is GHC itself.  (Oddly
> > enough, GPL is not the only open source license.)
>
> btw, what about GHC's reliance on the LGPLed GMP library? Doesn't that
> already taint the whole GHC eco-system?
>
> Quoting [1]:
>
> | GMP is licensed under the GNU Lesser General Public License (LGPL), a
> | kind of "copyleft" license. According to the terms of the LGPL,
> | paragraph 5, you may distribute a program that is designed to be
> | compiled and dynamically linked with the library under the terms of
> | your choice (i.e., commercially) but if your program incorporates
> | portions of the library, if it is linked statically, then your program
> | is a "derivative"--a "work based on the library"--and according to
> | paragraph 2, section c, you "must cause the whole of the work to be
> | licensed" under the terms of the LGPL (including for free).
> |
> | The LGPL licensing for GMP is a problem for the overall licensing of
> | binary programs compiled with GHC because most distributions (and
> | builds) of GHC use static libraries. (Dynamic libraries are currently
> | distributed only for OS X.) The LGPL licensing situation may be worse:
> | even though The Glasgow Haskell Compiler License is essentially a
> | "free software" license (BSD3), according to paragraph 2 of the LGPL,
> | GHC must be distributed under the terms of the LGPL!
>
>
> [1]:
> http://hackage.haskell.org/trac/ghc/wiki/ReplacingGMPNotes#ReasonsforReplacingGMPastheBignumlibrary
>
> cheers,
>   hvr
>
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