[WIP] Implement a VHDL backend

Makefile

@@ -2,6 +2,8 @@
 
 # Name or path to the ghdl executable.
 GHDL=ghdl
+GIT_VERSION_RAW := "$(shell git describe --dirty --always --tags)"
+GIT_VERSION = '$(GIT_VERSION_RAW)'
 
 YOSYS_CONFIG=yosys-config
 SOEXT=so
@@ -14,18 +16,21 @@ LIBGHDL_INC:=$(shell $(GHDL) --libghdl-include-dir)
 
 ALL_LDFLAGS=$(LIBGHDL_LIB) -Wl,-rpath,$(dir $(LIBGHDL_LIB)) $(LDFLAGS)
 
-ALL_CFLAGS=-fPIC -DYOSYS_ENABLE_GHDL -I$(LIBGHDL_INC) $(CFLAGS)
+ALL_CFLAGS=-fPIC -DYOSYS_ENABLE_GHDL -DVERSION=$(GIT_VERSION) -I$(LIBGHDL_INC) $(CFLAGS)
 
 all: ghdl.$(SOEXT)
 
-ghdl.$(SOEXT): ghdl.o
-	$(YOSYS_CONFIG) --build $@ $< -shared $(ALL_LDFLAGS)
+ghdl.$(SOEXT): ghdl.o vhdl_backend.o
+	$(YOSYS_CONFIG) --build $@ $^ -shared $(ALL_LDFLAGS)
 
 ghdl.o: src/ghdl.cc
 	$(YOSYS_CONFIG) --exec --cxx -c --cxxflags -o $@ $< $(ALL_CFLAGS)
 
+vhdl_backend.o: src/vhdl_backend.cc
+	$(YOSYS_CONFIG) --exec --cxx -c --cxxflags -o $@ $< $(ALL_CFLAGS)
+
 clean: force
-	$(RM) -f ghdl.$(SOEXT) ghdl.o
+	$(RM) -f ghdl.$(SOEXT) ghdl.o vhdl_backend.o
 
 install: ghdl.$(SOEXT)
 	$(YOSYS_CONFIG) --exec mkdir -p --datdir/plugins

src/Makefile.inc

@@ -1,2 +1,3 @@
 
 OBJS += frontends/ghdl/ghdl.o
+OBJS += backends/vhdl/vhdl_backend.o