LGPL library using only LGPL-parts of partially GPL shared library (gnutls, nettle)

Andreas Metzler ametzler at downhill.at.eu.org
Sun Feb 20 15:54:33 CET 2011

On 2011-02-20 Simon Josefsson <simon at josefsson.org> wrote:
> Andreas Metzler <ametzler at downhill.at.eu.org> writes:

> > I have the feeling that the discussion I started is an academic one
> > anyway. Nettle's public key library (libhogweed) uses and links against
> > libgmp, which is LGPLv3+. Therefore switching gnutls from gcrypt to
> > nettle would break GPLv2-compatibility (GPLv2 without the "or any
> > later version " clause). Oh dear.

> It has been discussed to dual-license some libraries under
> GPLv2+/LGPLv3+ to avoid this problem.  I wonder if this could be a way
> out here.  GnuTLS 2.12 is not released (and there is not even any
> release candidates), so we still have time to resolve this in a good
> way.

Afaik there is nothing GnuTLS can do. It is using the most permissive
license of the involved packages. The culprit is the combination of
third party (L)GPL-v2only software (e.g. cups) with libgmp, which
switched from LGPLv2+ to LGPLv3+ in 4.2.2.
cu andreas
`What a good friend you are to him, Dr. Maturin. His other friends are
so grateful to you.'
`I sew his ears on from time to time, sure'

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