various code: compiler warnings fixed.

libgtk/gtk3gamma.c

@@ -42,7 +42,6 @@
 static void gtk3_gamma_curve_destroy (GtkWidget *object);
 
 static void curve_type_changed_callback (GtkWidget *w, gpointer data);
-static void button_realize_callback     (GtkWidget *w);
 static void button_toggled_callback     (GtkWidget *w, gpointer data);
 static void button_clicked_callback     (GtkWidget *w, gpointer data);
 

src/gtkglue.c

@@ -249,7 +249,7 @@ gsg_close_dialog_callback (GtkWidget * widget, gpointer data)
 }
 
 void
-gsg_message (gchar * title, gchar * message)
+gsg_message (const gchar * title, const gchar * message)
 {
   GtkWidget *main_vbox, *label;
   GtkWidget *button, *message_dialog;
@@ -289,13 +289,13 @@ gsg_message (gchar * title, gchar * message)
 }
 
 void
-gsg_error (gchar * error)
+gsg_error (const gchar * error)
 {
   gsg_message ("Error", error);
 }
 
 void
-gsg_warning (gchar * warning)
+gsg_warning (const gchar * warning)
 {
   gsg_message ("Warning", warning);
 }

src/gtkglue.h

@@ -95,9 +95,9 @@ extern int gsg_make_path (size_t max_len, char *filename_ret,
 			  const char *prefix, const char *dev_name,
 			  const char *postfix);
 
-extern void gsg_message (gchar *title, gchar * message);
-extern void gsg_error (gchar * error_message);
-extern void gsg_warning (gchar * warning_message);
+extern void gsg_message (const gchar *title, const gchar * message);
+extern void gsg_error (const gchar * error_message);
+extern void gsg_warning (const gchar * warning_message);
 extern int gsg_get_filename (const char *label, const char *default_name,
 			     size_t max_len, char *filename);
 

src/preview.c

@@ -118,6 +118,8 @@
 static void scan_start (Preview * p);
 static void scan_done (Preview * p);
 
+// The only call to this has been commented out for some reason. [RL]
+#if 0
 static gboolean
 _last_call_time_check(unsigned long interval)
 {
@@ -135,7 +137,7 @@ _last_call_time_check(unsigned long interval)
 
     return TRUE;
 }
-
+#endif
 
 static void
 screen_size_get_dimensions (gint *width, gint *height)

src/xscanimage.c

@@ -453,6 +453,7 @@ null_print_func (const gchar * msg)
 
 #endif /* HAVE_LIBGIMP_GIMP_H */
 
+#ifdef GIMP_HAVE_RESOLUTION_INFO
 static SANE_Word
 get_resolution (SANE_Handle dev)
 {
@@ -492,6 +493,7 @@ get_resolution (SANE_Handle dev)
   DBG (DBG_debug, "get_resolution: finished\n");
   return 0;
 }
+#endif
 
 static void
 update_preview (GSGDialog * dialog, void *arg)