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-rw-r--r--epan/proto.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/epan/proto.h b/epan/proto.h
index 4d01bf29b4..1a599d6bc7 100644
--- a/epan/proto.h
+++ b/epan/proto.h
@@ -514,13 +514,18 @@ extern void proto_cleanup(void);
*/
extern gboolean proto_field_is_referenced(proto_tree *tree, int proto_id);
-
+/* XXX where should this go? */
+#ifdef __GNUC__
+#define WARN_IF_UNUSED __attribute__ ((warn_unused_result))
+#else
+#define WARN_IF_UNUSED
+#endif
/** Create a subtree under an existing item.
@param ti the parent item of the new subtree
@param idx one of the ett_ array elements registered with proto_register_subtree_array()
@return the new subtree */
-extern proto_tree* proto_item_add_subtree(proto_item *ti, const gint idx);
+extern proto_tree* proto_item_add_subtree(proto_item *ti, const gint idx) WARN_IF_UNUSED;
/** Get an existing subtree under an item.
@param ti the parent item of the subtree