Change build system so verilator doesn't require constant "make clean"s.

1 files changed, 6 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index f4a0da8..601e946 100644
--- a/Makefile
+++ b/Makefile
@@ -8,9 +8,12 @@ sim: build/Vtop
 .PHONY: sim
 
 build/Vtop: $(SOURCES) $(COLLATERAL)
-        @mkdir -p build
-        verilator +1800-2017ext+sv -Wall -Wno-BLKSEQ -Wno-UNUSED -O3 -Ihdl $(OPTS) --Mdir build --trace --cc --build -j --exe --top-module top $(SOURCES)
+        @rm -rf verilator
+        @mkdir -p build verilator
+        verilator +1800-2017ext+sv -Wall -Wno-BLKSEQ -Wno-UNUSED -O3 -Ihdl $(OPTS) --Mdir verilator --trace --cc --build -j --exe --top-module top $(SOURCES)
+        @ln -t build -f verilator/Vtop
+        @rm -rf verilator
 
 clean:
-        rm -rf build
+        rm -rf build verilator
 .PHONY: clean