Update License to GPLv3+ including new Autoconf Exception.

* NEWS, README: Update licensing information.
* COPYING.EXCEPTION: New file.
* Makefile.am (EXTRA_DIST): Distribute it.
* cfg.mk (autom4te-update): Remove copyright change warning.
* lib/autoconf/autoconf.m4, lib/autoconf/autoheader.m4,
lib/autoconf/autoscan.m4, lib/autoconf/autotest.m4,
lib/autoconf/autoupdate.m4, lib/autoconf/c.m4,
lib/autoconf/erlang.m4, lib/autoconf/fortran.m4,
lib/autoconf/functions.m4, lib/autoconf/general.m4,
lib/autoconf/headers.m4, lib/autoconf/lang.m4,
lib/autoconf/libs.m4, lib/autoconf/oldnames.m4,
lib/autoconf/programs.m4, lib/autoconf/specific.m4,
lib/autoconf/status.m4, lib/autoconf/types.m4,
lib/autotest/autotest.m4, lib/autotest/general.m4,
lib/autotest/specific.m4, lib/m4sugar/foreach.m4,
lib/m4sugar/m4sh.m4, lib/m4sugar/m4sugar.m4: Update exception
statement, bump to GPLv3.
* bin/autoconf.as, bin/autoheader.in, bin/autom4te.in,
bin/autoreconf.in, bin/autoscan.in, bin/autoupdate.in,
bin/ifnames.in: Bump to GPLv3+, adjust --version output
to reflect the GPLv3+ and the Autoconf Exception.
* lib/Autom4te/C4che.pm, lib/Autom4te/ChannelDefs.pm,
lib/Autom4te/General.pm, lib/Autom4te/Request.pm,
lib/autom4te.in, lib/autoscan/autoscan.pre,
lib/emacs/autoconf-mode.el, lib/emacs/autotest-mode.el,
lib/freeze.mk, tests/atlocal.in, tests/autoscan.at,
tests/autotest.at, tests/base.at, tests/c.at,
tests/compile.at, tests/erlang.at, tests/foreign.at,
tests/fortran.at, tests/local.at, tests/m4sh.at,
tests/m4sugar.at, tests/mktests.sh, tests/semantics.at,
tests/statesave.m4, tests/suite.at, tests/tools.at,
tests/torture.at, tests/wrapper.as: Bump to GPLv3+.

1 files changed, 43 insertions, 0 deletions

diff --git a/COPYING.EXCEPTION b/COPYING.EXCEPTION
new file mode 100644
index 00000000..46958352
--- /dev/null
+++ b/COPYING.EXCEPTION
@@ -0,0 +1,43 @@
+                   AUTOCONF CONFIGURE SCRIPT EXCEPTION
+                       Version 3.0, 18 August 2009
+
+ Copyright (C) 2009 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+This Exception is an additional permission under section 7 of the GNU
+General Public License, version 3 ("GPLv3").  It applies to a given
+file that bears a notice placed by the copyright holder of the file
+stating that the file is governed by GPLv3 along with this Exception.
+
+The purpose of this Exception is to allow distribution of Autoconf's
+typical output under terms of the recipient's choice (including
+proprietary).
+
+0. Definitions
+
+"Covered Code" is the source or object code of a version of Autoconf
+that is a covered work under this License.
+
+"Normally Copied Code" for a version of Autoconf means all parts of
+its Covered Code which that version can copy from its code (i.e., not
+from its input file) into its minimally verbose, non-debugging and
+non-tracing output.
+
+"Ineligible Code" is Covered Code that is not Normally Copied Code.
+
+1. Grant of Additional Permission.
+
+You have permission to propagate output of Autoconf, even if such
+propagation would otherwise violate the terms of GPLv3.  However, if
+by modifying Autoconf you cause any Ineligible Code of the version you
+received to become Normally Copied Code of your modified version, then
+you void this Exception for the resulting covered work.  If you convey
+that resulting covered work, you must remove this Exception in accordance
+with the second paragraph of Section 7 of GPLv3.
+
+2. No Weakening of Autoconf Copyleft.
+
+The availability of this Exception does not imply any general presumption
+that third-party software is unaffected by the copyleft requirements of
+the license of Autoconf.