mergetool: don't require a work tree for --tool-help

diff --git a/cache.h b/cache.h
index cc46be4e0fb2e8cdc69e48386f8233354a348818..c708062df95d30eccf713d3f1c38897499750061 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1354,6 +1354,7 @@ extern void *alloc_commit_node(void);
 extern void *alloc_tag_node(void);
 extern void *alloc_object_node(void);
 extern void alloc_report(void);
+extern unsigned int alloc_commit_index(void);
 
 /* trace.c */
 __attribute__((format (printf, 1, 2)))