Annotate for -Wunused-parameter, add -Wextra

Useful during development.

Author: Lekensteyn

Makefile

@@ -19,7 +19,7 @@ clean:
 	rm -f libgobject-list.so $(OBJS)
 
 %.o: %.c
-	$(CC) -fPIC -rdynamic -g -c -Wall ${FLAGS} ${BUILD_OPTIONS} $<
+	$(CC) -fPIC -rdynamic -g -c -Wall -Wextra ${FLAGS} ${BUILD_OPTIONS} $<
 
 libgobject-list.so: $(OBJS)
 ifeq ($(HAVE_LIBUNWIND), 1)

gobject-list.c

@@ -199,7 +199,7 @@ _dump_object_list (GHashTable *hash)
 }
 
 static void
-_sig_usr1_handler (int signal)
+_sig_usr1_handler (G_GNUC_UNUSED int signal)
 {
   g_print ("Living Objects:\n");
 
@@ -209,7 +209,7 @@ _sig_usr1_handler (int signal)
 }
 
 static void
-_sig_usr2_handler (int signal)
+_sig_usr2_handler (G_GNUC_UNUSED int signal)
 {
   GHashTableIter iter;
   gpointer obj, type;
@@ -315,7 +315,7 @@ get_func (const char *func_name)
 }
 
 static void
-_object_finalized (gpointer data,
+_object_finalized (G_GNUC_UNUSED gpointer data,
     GObject *obj)
 {
   G_LOCK (gobject_list);