Re: gnulib-tool --lgpl doesn't convert gplv3 to lgplv2.1

[Bruno Haible]

Simon Josefsson wrote:
> I noticed this for the dummy.c module, which after been imported with
> --lgpl said:
> 
>    This program 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.
> 
> The dummy.c in gnulib contains the GPLv3 header, and the modules file
> says LGPLv2+.
> 
> The patch below fixes this, but I'm not sure if there are other
> unintended consequences.  Comments?  Ok to install?

The patch is not ok: it would also change LGPLv3+ files to LGPLv2+ without
checking that it is allowed to do this.

This is old code, meant to change a GPLv2+ to LGPLv2+.

In the current situation (where we care about the distinction between
LGPLv2+ and LGPLv3+ but where GPL means GPLv3+ always), what is needed is
that the option --lgpl takes an argument: --lgpl=2 means to convert to
LGPLv2+, whereas --lgpl or --lgpl=3 means to convert to LGPLv3+.

Pieces of gnulib-tool affected: command line parsing, usage message,
reading and writing of the configuration, sed_transform_lib_file,
verification of license (lines 2210..2220).

Bruno