From 71a3ea8abcacd9907b3a1bcc4e2588b6905526fa Mon Sep 17 00:00:00 2001
From: Jerry Zhao <jerryz123@berkeley.edu>
Date: Tue, 24 Nov 2020 16:44:20 -0800
Subject: [PATCH] Allow custom verilator optimization flags

---
 sims/verilator/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sims/verilator/Makefile b/sims/verilator/Makefile
index 65e64179e1..2b250ee964 100644
--- a/sims/verilator/Makefile
+++ b/sims/verilator/Makefile
@@ -84,7 +84,7 @@ TRACING_CFLAGS := $(if $(filter $(VERILATOR_FST_MODE),0),,-DCY_FST_TRACE)
 #----------------------------------------------------------------------------------------
 # we initially had --noassert for performance, but several modules use
 # assertions, including dramsim, so we enable --assert by default
-VERILATOR_OPT_FLAGS := \
+VERILATOR_OPT_FLAGS ?= \
 	-O3 \
 	--x-assign fast \
 	--x-initial fast \