On Thu, Sep 5, 2013 at 1:23 PM, Peter Keller <psilord@cs.wisc.edu> wrote:
On Thu, Sep 05, 2013 at 06:38:36PM +0200, Waldek Hebisch wrote:
> Juan Jose Garcia-Ripoll wrote:
> >
> > Note that I do not intend to change the interface. ECL would continue
> > to build with GMP, and for platforms that make it easy to pull in
> > arbitrary software (Linux *BSD, etc) this is the recommended option.
> > However, elsewhere we need a library that can be packed together with
> > ECL and which does not have license problems -- GMP switched to a more
> > restrictive license and this means I cannot upgrade ECL to use newer
> > versions.
> Could you explain this?  Looking at GMP site I see that they
> claim licence to be LGPL v3+.  Looking at MPIR site I see
> the same.  So what is different?

Actually download the most recent GMP version and look at the license. It
doesn't appear to be LGPL anymore--instead it is GPL v3.

On what branch?

The sources in Mercurial all seem to have the typical LGPL notice in the README and individual .c files — am I missing something?

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

OTOH, I have “heard legends” that MPIR is “easier to compile” for Windows. I have no direct knowledge either way, but that would be a rather compelling reason to support both, I'd imagine.