auto-detect changed prefix and/or changed build flags

diff --git a/builtin-diff.c b/builtin-diff.c
index de81b05e32f884053060448bc59c83ff70961c24..6ac3d4b8ca23e7c4d724b22fd3222005d8fe3df8 100644 (file)
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -233,7 +233,7 @@ static int builtin_diff_combined(struct rev_info *revs,
        return 0;
 }
 
-static void add_head(struct rev_info *revs)
+void add_head(struct rev_info *revs)
 {
        unsigned char sha1[20];
        struct object *obj;
@@ -303,9 +303,9 @@ int cmd_diff(int argc, const char **argv, char **envp)
                obj = deref_tag(obj, NULL, 0);
                if (!obj)
                        die("invalid object '%s' given.", name);
-               if (!strcmp(obj->type, commit_type))
+               if (obj->type == TYPE_COMMIT)
                        obj = &((struct commit *)obj)->tree->object;
-               if (!strcmp(obj->type, tree_type)) {
+               if (obj->type == TYPE_TREE) {
                        if (ARRAY_SIZE(ent) <= ents)
                                die("more than %d trees given: '%s'",
                                    (int) ARRAY_SIZE(ent), name);
@@ -315,7 +315,7 @@ int cmd_diff(int argc, const char **argv, char **envp)
                        ents++;
                        continue;
                }
-               if (!strcmp(obj->type, blob_type)) {
+               if (obj->type == TYPE_BLOB) {
                        if (2 <= blobs)
                                die("more than two blobs given: '%s'", name);
                        memcpy(blob[blobs].sha1, obj->sha1, 20);