merge by hand changes from mtaht to fix up export behaviour, and gcc warnings when optimized

git-svn-id: svn://localhost/ardour2/trunk@1332 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/session.cc

@@ -3397,7 +3397,7 @@ Session::remove_redirect (Redirect* redirect)
 nframes_t
 Session::available_capture_duration ()
 {
-	float sample_bytes_on_disk;
+	float sample_bytes_on_disk = 4.0; // keep gcc happy
 
 	switch (Config->get_native_file_data_format()) {
 	case FormatFloat:

libs/ardour/session_command.cc

@@ -28,7 +28,7 @@ Session::memento_command_factory(XMLNode *n)
 {
     PBD::ID id;
     XMLNode *before = 0, *after = 0;
-    XMLNode *child;
+    XMLNode *child = 0;
 
     /* get id */
     id = PBD::ID(n->property("obj_id")->value());

libs/pbd/whitespace.cc

@@ -9,7 +9,7 @@ strip_whitespace_edges (string& str)
 {   
     string::size_type i; 
     string::size_type len;    
-    string::size_type s;
+    string::size_type s = 0;
 			            
     len = str.length();