From dcbe759b6434872b0e91ff825579623e96f3defc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jean-Fran=C3=A7ois=20Nguyen?= <jf@lambdaconcept.com>
Date: Fri, 2 Nov 2018 14:22:44 +0100
Subject: [PATCH] build/sim/verilator: don't use --threads when $(THREADS) is
 unset

---
 litex/build/sim/core/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litex/build/sim/core/Makefile b/litex/build/sim/core/Makefile
index daba3dda..4be325ca 100644
--- a/litex/build/sim/core/Makefile
+++ b/litex/build/sim/core/Makefile
@@ -27,7 +27,7 @@ sim: mkdir $(OBJS_SIM)
 	verilator -Wno-fatal -O3 --cc dut.v --top-module dut --exe \
 		$(SRCS_SIM_CPP) $(OBJS_SIM) \
 		--top-module dut \
-		--threads $(THREADS) \
+		$(if $(THREADS), --threads $(THREADS),) \
 		-CFLAGS "$(CFLAGS) -I$(SRC_DIR)" \
 		-LDFLAGS "$(LDFLAGS)" \
 		-trace $(INC_DIR)
-- 
2.30.2