configure: disable Archipelago by default and warn about libxseg GPLv3 license

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 <[email protected]>
Suggested-by: Kevin Wolf <[email protected]>
Reported-by: Andreas Färber <[email protected]>
Signed-off-by: Stefan Hajnoczi <[email protected]>
Reviewed-by: Andreas Färber <[email protected]>
Message-id: 1428587538[email protected]
Signed-off-by: Peter Maydell <[email protected]>

diff --git a/configure b/configure
index 09c922511cd0beeabd8530fd1ed36109336e8111..8b673fdc345880166e8bb542aad883cc3e14000a 100755 (executable)
--- 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"