list-objects: mark unused callback parameters

Our graph-traversal functions take callbacks for showing commits and
objects, but not all callbacks need each parameter.  Likewise for the
similar traverse_bitmap_commit_list(), which has a different interface
but serves the same purpose. And the include_check mechanism, which
passes along a void pointer which is not always used.

Mark the unused ones to to make -Wunused-parameter happy.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/pack-objects.c

@@ -1590,7 +1590,7 @@ static int add_object_entry(const struct object_id *oid, enum object_type type,
 
 static int add_object_entry_from_bitmap(const struct object_id *oid,
 					enum object_type type,
-					int flags, uint32_t name_hash,
+					int flags UNUSED, uint32_t name_hash,
 					struct packed_git *pack, off_t offset)
 {
 	display_progress(progress_state, ++nr_seen);
@@ -3464,7 +3464,7 @@ static void add_cruft_object_entry(const struct object_id *oid, enum object_type
 	return;
 }
 
-static void show_cruft_object(struct object *obj, const char *name, void *data)
+static void show_cruft_object(struct object *obj, const char *name, void *data UNUSED)
 {
 	/*
 	 * if we did not record it earlier, it's at least as old as our
@@ -3484,7 +3484,7 @@ static void show_cruft_commit(struct commit *commit, void *data)
 	show_cruft_object((struct object*)commit, NULL, data);
 }
 
-static int cruft_include_check_obj(struct object *obj, void *data)
+static int cruft_include_check_obj(struct object *obj, void *data UNUSED)
 {
 	return !has_object_kept_pack(&obj->oid, IN_CORE_KEEP_PACKS);
 }
@@ -3663,7 +3663,7 @@ static void read_object_list_from_stdin(void)
 	}
 }
 
-static void show_commit(struct commit *commit, void *data)
+static void show_commit(struct commit *commit, void *data UNUSED)
 {
 	add_object_entry(&commit->object.oid, OBJ_COMMIT, NULL, 0);
 
@@ -3674,7 +3674,8 @@ static void show_commit(struct commit *commit, void *data)
 		propagate_island_marks(commit);
 }
 
-static void show_object(struct object *obj, const char *name, void *data)
+static void show_object(struct object *obj, const char *name,
+			void *data UNUSED)
 {
 	add_preferred_base_object(name);
 	add_object_entry(&obj->oid, obj->type, name, 0);

builtin/rev-list.c

@@ -362,11 +362,11 @@ static int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
 
 static int show_object_fast(
 	const struct object_id *oid,
-	enum object_type type,
-	int exclude,
-	uint32_t name_hash,
-	struct packed_git *found_pack,
-	off_t found_offset)
+	enum object_type type UNUSED,
+	int exclude UNUSED,
+	uint32_t name_hash UNUSED,
+	struct packed_git *found_pack UNUSED,
+	off_t found_offset UNUSED)
 {
 	fprintf(stdout, "%s\n", oid_to_hex(oid));
 	return 1;

pack-bitmap.c

@@ -951,7 +951,8 @@ static void show_object(struct object *object, const char *name, void *data_)
 	bitmap_set(data->base, bitmap_pos);
 }
 
-static void show_commit(struct commit *commit, void *data)
+static void show_commit(struct commit *commit UNUSED,
+			void *data UNUSED)
 {
 }
 
@@ -1940,7 +1941,8 @@ static void test_bitmap_type(struct bitmap_test_data *tdata,
 		    type_name(bitmap_type));
 }
 
-static void test_show_object(struct object *object, const char *name,
+static void test_show_object(struct object *object,
+			     const char *name UNUSED,
 			     void *data)
 {
 	struct bitmap_test_data *tdata = data;

reachable.c

@@ -48,7 +48,9 @@ static int add_one_ref(const char *path, const struct object_id *oid,
  * The traversal will have already marked us as SEEN, so we
  * only need to handle any progress reporting here.
  */
-static void mark_object(struct object *obj, const char *name, void *data)
+static void mark_object(struct object *obj UNUSED,
+			const char *name UNUSED,
+			void *data)
 {
 	update_progress(data);
 }
@@ -202,10 +204,10 @@ int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
 
 static int mark_object_seen(const struct object_id *oid,
 			     enum object_type type,
-			     int exclude,
-			     uint32_t name_hash,
-			     struct packed_git *found_pack,
-			     off_t found_offset)
+			     int exclude UNUSED,
+			     uint32_t name_hash UNUSED,
+			     struct packed_git *found_pack UNUSED,
+			     off_t found_offset UNUSED)
 {
 	struct object *obj = lookup_object_by_type(the_repository, oid, type);
 	if (!obj)