"git diff": do not ignore index without --no-index

Even if "foo" and/or "bar" does not exist in index, "git diff foo bar"
should not change behaviour drastically from "git diff foo bar baz" or
"git diff foo".  A feature that "sometimes works and is handy" is an
unreliable cute hack.

"git diff foo bar" outside a git repository continues to work as a more
colourful alternative to "diff -u" as before.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 865e2bfcf..ad09e6c8b 100644
--- a/Makefile
+++ b/Makefile
@@ -405,6 +405,7 @@ LIB_OBJS += diffcore-order.o
 LIB_OBJS += diffcore-pickaxe.o
 LIB_OBJS += diffcore-rename.o
 LIB_OBJS += diff-delta.o
+LIB_OBJS += diff-no-index.o
 LIB_OBJS += diff-lib.o
 LIB_OBJS += diff.o
 LIB_OBJS += dir.o