Support TestDriver.v as top

sims/vcs/vcs.mk

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+HELP_COMPILATION_VARIABLES += \
+"   USE_VPD                = set to '1' to build VCS simulator to emit VPD instead of FSDB."
+
+HELP_SIMULATION_VARIABLES += \
+"   USE_VPD                = set to '1' to run VCS simulator emitting VPD instead of FSDB."
+
+ifndef USE_VPD
+WAVEFORM_FLAG=+fsdbfile=$(sim_out_name).fsdb
+else
+WAVEFORM_FLAG=+vcdplusfile=$(sim_out_name).vpd
+endif
+
+# If ntb_random_seed unspecified, vcs uses 1 as constant seed.
+# Set ntb_random_seed_automatic to actually get a random seed
+ifdef RANDOM_SEED
+SEED_FLAG=+ntb_random_seed=$(RANDOM_SEED)
+else
+SEED_FLAG=+ntb_random_seed_automatic
+endif
+
+CLOCK_PERIOD ?= 1.0
+RESET_DELAY ?= 777.7
+
+#----------------------------------------------------------------------------------------
+# gcc configuration/optimization
+#----------------------------------------------------------------------------------------
+include $(base_dir)/sims/common-sim-flags.mk
+
+VCS_CXXFLAGS = $(SIM_CXXFLAGS)
+VCS_LDFLAGS = $(SIM_LDFLAGS)
+
+# vcs requires LDFLAGS to not include library names (i.e. -l needs to be separate)
+VCS_CC_OPTS = \
+	-CFLAGS "$(VCS_CXXFLAGS)" \
+	-LDFLAGS "$(filter-out -l%,$(VCS_LDFLAGS))" \
+	$(filter -l%,$(VCS_LDFLAGS))
+
+VCS_NONCC_OPTS = \
+	-notice \
+	-line \
+	+lint=all,noVCDE,noONGS,noUI \
+	-error=PCWM-L \
+	-error=noZMMCM \
+	-timescale=1ns/10ps \
+	-quiet \
+	-q \
+	+rad \
+	+vcs+lic+wait \
+	+vc+list \
+	-f $(sim_common_files) \
+	-sverilog +systemverilogext+.sv+.svi+.svh+.svt -assert svaext +libext+.sv \
+	+v2k +verilog2001ext+.v95+.vt+.vp +libext+.v \
+	-debug_pp \
+	+incdir+$(GEN_COLLATERAL_DIR)
+
+VCS_PREPROC_DEFINES = \
+	+define+VCS
+
+ifndef USE_VPD
+PREPROC_DEFINES += +define+FSDB
+endif