First part of alu implementation

Makefile

@@ -6,13 +6,13 @@ PARTS	=	alu
 all: $(PARTS)
 
 %: %.vhd tb_%.vhd
-	$(CHDL) -a $(FLAGS)
-	$(CHDL) -e $(FLAGS)
-	$(CHDL) -r $(FLAGS) --wave=$@.ghw --stop-time=$(STOP)
+	$(CHDL) -a $(FLAGS) $^
+	$(CHDL) -e $(FLAGS) $@
+	$(CHDL) -r $(FLAGS) $@ --wave=$@.ghw --stop-time=$(STOP)
 
 clean:
-	find . -name '*.o' -exec rm -r {}\;
-	find . -name '*.cf' -exec rm -r {}\;
-	find . -name '*.ghw' -exec rm -r {}\;
+	rm *.o
+	rm *.cf
+	rm *.ghw
 
-.PHONY: all clean
+.PHONY: all clean $(PARTS)