travis: build verilator and toolchain as part of install

.travis.yml

@@ -46,6 +46,9 @@ branches:
     - boom
     - /^hurricane.*$/
 
+install:
+  - make tools verilator -C regression SUITE=none
+
 before_install:
   - export CXX=g++-4.8 CC=gcc-4.8
 

emulator/Makefrag-verilator

@@ -46,6 +46,8 @@ verilator/verilator-$(VERILATOR_VERSION).tar.gz:
 	mkdir -p $(dir $@)
 	wget http://www.veripool.org/ftp/verilator-$(VERILATOR_VERSION).tgz -O $@
 
+verilator: $(INSTALLED_VERILATOR)
+
 # Run Verilator to produce a fast binary to emulate this circuit.
 VERILATOR := $(INSTALLED_VERILATOR) --cc --exe
 VERILATOR_FLAGS := --top-module $(MODEL) \

regression/Makefile

@@ -78,6 +78,8 @@ endif
 # commandline a bit cleaner.
 submodules: stamps/other-submodules.stamp
 tools: $(RISCV)/install.stamp
+verilator:
+	$(MAKE) RISCV=$(RISCV) -C $(abspath $(TOP)/emulator) verilator
 
 EMU_DEBUG_STAMPS=$(foreach config,$(CONFIGS),stamps/$(config)/emulator-debug.stamp)
 EMU_NDEBUG_STAMPS=$(foreach config,$(CONFIGS),stamps/$(config)/emulator-ndebug.stamp)