added static lib to Makefile

Makefile

@@ -9,13 +9,25 @@ LEX = flex
 YACC = bison
 YFLAGS = -y -d
 
-BIN = bin
+LIB_OBJS = obj/common.o obj/templates.o
 
-all: $(BIN)
+BIN = parcival
+A_LIB = libparcival.a
+
+all: $(BIN) $(A_LIB)
 
 $(BIN): gen/y.tab.c gen/lex.yy.c src/main.c src/tree.c src/common.c
 	$(CC) $(CFLAGS) -o $@ $^
 
+$(A_LIB): CFLAGS += -fPIC
+$(A_LIB): $(LIB_OBJS)
+	$(AR) $(ARFLAGS) $@ $^
+
+obj/%.o: src/%.c obj
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+obj:
+	mkdir -p $@
 
 gen: 
 	mkdir -p $@
@@ -31,3 +43,6 @@ gen/lex.yy.c: src/scanner.l gen/y.tab.h gen
 	
 clean:
 	rm -f gen/*
+	rm -f obj/*
+	rm -f $(BIN)
+	rm -f $(A_LIB)