Fix -Werror=cast-function-type

Bump glib-2 required version to 2.58:

  G_SOURCE_FUNC

  https://gitlab.gnome.org/GNOME/glib/commit/039fa6897bb4c5cd30caec8ee3add1a4ef612f76

Build & install:i

  export CC=gcci
  export CFLAGS=-Werror=cast-function-type
  ./autogen.sh --prefix=/usr
  make clean
  make
  sudo make install

2 files changed, 25 insertions, 6 deletions

diff --git a/src/ui/menu.c b/src/ui/menu.c
index aeba64fa..90db5f1e 100644
--- a/src/ui/menu.c
+++ b/src/ui/menu.c
@@ -100,6 +100,21 @@ static MenuItem menuitems[] = {
 	{META_MENU_OP_DELETE, MENU_ITEM_IMAGE, MARCO_STOCK_DELETE, FALSE, N_("_Close")}
 };
 
+static void
+sn_menu_data_free (MenuData *menu_data,
+                   GClosure *closure)
+{
+  g_free (menu_data->menu);
+  g_free (menu_data);
+}
+
+static void
+sn_menu_item_free (MenuItem *menu_item,
+                   GClosure *closure)
+{
+  g_free (menu_item);
+}
+
 static void popup_position_func(GtkMenu* menu, gint* x, gint* y, gboolean* push_in, gpointer user_data)
 {
 	GtkRequisition req;
@@ -442,7 +457,7 @@ meta_window_menu_new   (MetaFrames         *frames,
                           "activate",
                           G_CALLBACK (activate_cb),
                           md,
-                          (GClosureNotify) g_free, 0);
+                          (GClosureNotify) sn_menu_data_free, 0);
 
                       gtk_menu_shell_append (GTK_MENU_SHELL (submenu), submi);
 
@@ -469,7 +484,7 @@ meta_window_menu_new   (MetaFrames         *frames,
                                      "activate",
                                      G_CALLBACK (activate_cb),
                                      md,
-                                     (GClosureNotify) g_free, 0);
+                                     (GClosureNotify) sn_menu_item_free, 0);
             }
 
           if (mi)
diff --git a/src/ui/tabpopup.c b/src/ui/tabpopup.c
index 37231a5b..10c7898f 100644
--- a/src/ui/tabpopup.c
+++ b/src/ui/tabpopup.c
@@ -636,7 +636,9 @@ unselect_image (GtkWidget *widget)
   gtk_widget_queue_draw (widget);
 }
 
-static void     meta_select_image_class_init   (MetaSelectImageClass *klass);
+static void     meta_select_image_class_init   (MetaSelectImageClass *klass,
+                                                void                 *data);
+
 static gboolean meta_select_image_draw         (GtkWidget            *widget,
                                                 cairo_t              *cr);
 
@@ -669,7 +671,7 @@ meta_select_image_get_type (void)
 }
 
 static void
-meta_select_image_class_init (MetaSelectImageClass *klass)
+meta_select_image_class_init (MetaSelectImageClass *klass, void *data)
 {
   GtkWidgetClass *widget_class;
 
@@ -805,7 +807,8 @@ unselect_workspace (GtkWidget *widget)
   gtk_widget_queue_draw (widget);
 }
 
-static void meta_select_workspace_class_init (MetaSelectWorkspaceClass *klass);
+static void meta_select_workspace_class_init (MetaSelectWorkspaceClass *klass,
+                                              void                     *data);
 
 static gboolean meta_select_workspace_draw (GtkWidget *widget,
                                             cairo_t   *cr);
@@ -840,7 +843,8 @@ meta_select_workspace_get_type (void)
 }
 
 static void
-meta_select_workspace_class_init (MetaSelectWorkspaceClass *klass)
+meta_select_workspace_class_init (MetaSelectWorkspaceClass *klass,
+                                  void                     *data)
 {
   GtkWidgetClass *widget_class;