[Qemu-devel] [PATCH for-2.3] configure: disable by default and warn about libxseg GPLv3 license

[Stefan Hajnoczi <stefanha@redhat.com>]

libxseg has changed license to GPLv3.  QEMU includes GPL "v2 only" code
which is not compatible with GPLv3.  This means the resulting binaries
may not be redistributable!

Disable Archipelago (libxseg) by default to prevent accidental license
violations.  Also warn if linking against libxseg is enabled to remind
the user.

Note that this commit does not constitute any advice about software
licensing.  If you have doubts you should consult a lawyer.

Cc: Chrysostomos Nanakos <cnanakos@grnet.gr>
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Reported-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 configure | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

While libxseg reconsiders its license, let's disable it by default and warn
users that they need to carefully check whether the licenses are compatible.

diff --git a/configure b/configure
index 09c9225..9219ba3 100755
--- a/configure
+++ b/configure
@@ -327,7 +327,7 @@ seccomp=""
 glusterfs=""
 glusterfs_discard="no"
 glusterfs_zerofill="no"
-archipelago=""
+archipelago="no"
 gtk=""
 gtkabi=""
 vte=""
@@ -3173,6 +3173,12 @@ EOF
         archipelago="yes"
         libs_tools="$archipelago_libs $libs_tools"
         libs_softmmu="$archipelago_libs $libs_softmmu"
+
+	echo "WARNING: Please check the licenses of QEMU and libxseg carefully."
+	echo "GPLv3 versions of libxseg may not be compatible with QEMU's "
+	echo "license and therefore prevent redistribution."
+	echo
+	echo "To disable Archipelago, use --disable-archipelago"
     else
       if test "$archipelago" = "yes" ; then
         feature_not_found "Archipelago backend support" "Install libxseg devel"
-- 
2.1.0