rust: add a ObjectID struct

We'd like to be able to write some Rust code that can work with object
IDs.  Add a structure here that's identical to struct object_id in C,
for easy use in sharing across the FFI boundary.  We will use this
structure in several places in hot paths, such as index-pack or
pack-objects when converting between algorithms, so prioritize efficient
interchange over a more idiomatic Rust approach.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 8aa489f3b6..88ae4c4b2f 100644
--- a/Makefile
+++ b/Makefile
@@ -1545,6 +1545,7 @@ CLAR_TEST_OBJS += $(UNIT_TEST_DIR)/unit-test.o
 
 UNIT_TEST_OBJS += $(UNIT_TEST_DIR)/test-lib.o
 
+RUST_SOURCES += src/hash.rs
 RUST_SOURCES += src/lib.rs
 RUST_SOURCES += src/varint.rs