From 048492e54cecf76860c4c299e81f66be64873fa3 Mon Sep 17 00:00:00 2001
From: Albert Ou <aou@eecs.berkeley.edu>
Date: Tue, 2 Oct 2018 17:43:51 -0700
Subject: [PATCH] mk: Ensure that FIRRTL jar has updated timestamp

SBT does not replace $(ROCKETCHIP_DIR)/firrtl/utils/bin/firrtl.jar if
compilation produces the same results.
---
 Makefrag | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefrag b/Makefrag
index 594ca080..4a6be9fa 100644
--- a/Makefrag
+++ b/Makefrag
@@ -13,8 +13,9 @@ FIRRTL ?= java -Xmx2G -Xss8M -XX:MaxPermSize=256M -cp $(ROCKET_CLASSES):$(FIRRTL
 
 $(FIRRTL_JAR): $(call lookup_scala_srcs, $(ROCKETCHIP_DIR)/firrtl/src/main/scala)
 	$(MAKE) -C $(ROCKETCHIP_DIR)/firrtl SBT="$(SBT)" root_dir=$(ROCKETCHIP_DIR)/firrtl build-scala
-	mkdir -p $(ROCKETCHIP_DIR)/lib
-	cp -p $(ROCKETCHIP_DIR)/firrtl/utils/bin/firrtl.jar $(FIRRTL_JAR)
+	mkdir -p $(dir $@)
+	cp -p $(ROCKETCHIP_DIR)/firrtl/utils/bin/firrtl.jar $@
+	touch $@
 
 build_dir=$(sim_dir)/generated-src
 testchip_dir = $(base_dir)/testchipip