Mark the variable declarations in .h files as extern

This allows git to be built even with linkers which are not smart enough
to join those symbols, and makes this correct C. Pointed out by several
people.

1 files changed, 2 insertions, 2 deletions

diff --git a/object.h b/object.h
index d53a35a4d7..09700d3760 100644
--- a/object.h
+++ b/object.h
@@ -15,8 +15,8 @@ struct object {
 	struct object_list *refs;
 };
 
-int nr_objs;
-struct object **objs;
+extern int nr_objs;
+extern struct object **objs;
 
 struct object *lookup_object(unsigned char *sha1);