auto-detect changed prefix and/or changed build flags

diff --git a/tag.c b/tag.c
index b1ab75ff0164b0090f43ba55d2a70239ca2fdb7a..91913332709eb67252a776ddd1995e183a1a5bf5 100644 (file)
--- a/tag.c
+++ b/tag.c
@@ -1,12 +1,17 @@
-#include "tag.h"
 #include "cache.h"
+#include "tag.h"
 
 const char *tag_type = "tag";
 
-struct object *deref_tag(struct object *o)
+struct object *deref_tag(struct object *o, const char *warn, int warnlen)
 {
-       while (o && o->type == tag_type)
+       while (o && o->type == TYPE_TAG)
                o = parse_object(((struct tag *)o)->tagged->sha1);
+       if (!o && warn) {
+               if (!warnlen)
+                       warnlen = strlen(warn);
+               error("missing object referenced by '%.*s'", warnlen, warn);
+       }
        return o;
 }
 
@@ -14,17 +19,16 @@ struct tag *lookup_tag(const unsigned char *sha1)
 {
         struct object *obj = lookup_object(sha1);
         if (!obj) {
-                struct tag *ret = xmalloc(sizeof(struct tag));
-                memset(ret, 0, sizeof(struct tag));
+                struct tag *ret = xcalloc(1, sizeof(struct tag));
                 created_object(sha1, &ret->object);
-                ret->object.type = tag_type;
+                ret->object.type = TYPE_TAG;
                 return ret;
         }
        if (!obj->type)
-               obj->type = tag_type;
-        if (obj->type != tag_type) {
-                error("Object %s is a %s, not a tree", 
-                      sha1_to_hex(sha1), obj->type);
+               obj->type = TYPE_TAG;
+        if (obj->type != TYPE_TAG) {
+                error("Object %s is a %s, not a tree",
+                      sha1_to_hex(sha1), typename(obj->type));
                 return NULL;
         }
         return (struct tag *) obj;
@@ -70,8 +74,11 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
        item->tag[taglen] = '\0';
 
        item->tagged = lookup_object_type(object, type);
-       if (item->tagged)
-               add_ref(&item->object, item->tagged);
+       if (item->tagged && track_object_refs) {
+               struct object_refs *refs = alloc_object_refs(1);
+               refs->ref[0] = item->tagged;
+               set_object_refs(&item->object, refs);
+       }
 
        return 0;
 }