fix crasher caused by regions not being deleted on session unload; fix up srctar scons target for new sigc++

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@3529 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/audioregion.cc

@@ -1481,6 +1481,15 @@ AudioRegion::speed_mismatch (float sr) const
 void
 AudioRegion::source_offset_changed ()
 {
+	/* XXX this fixes a crash that should not occur. It does occur
+	   becauses regions are not being deleted when a session
+	   is unloaded. That bug must be fixed.
+	*/
+
+	if (sources.empty()) {
+		return;
+	}
+
 	boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(sources.front());
 
 	if (afs && afs->destructive()) {

libs/sigc++2/SConscript

@@ -25,6 +25,7 @@ env.Alias('install', env.Install(os.path.join(install_prefix, env['LIBDIR'], 'ar
 env.Alias('tarball', env.Distribute (env['DISTTREE'],
                                      [ 'NEWS', 'README', 'AUTHORS', 'ChangeLog',
                                        'configure', 'configure.ac', 'Makefile.am', 'SConscript',
+                                       'config.sub', 'config.guess',
                                        'sigc++/Makefile.in', 
                                        'sigc++config.h',
                                        'sigc++config.h.in',

svn_revision.h

@@ -1,4 +1,4 @@
 #ifndef __ardour_svn_revision_h__
 #define __ardour_svn_revision_h__
-static const char* ardour_svn_revision = "3343";
+static const char* ardour_svn_revision = "3527";
 #endif