add windows support

makefile

@@ -3,29 +3,34 @@ LFLAGS =
 YACC = yacc
 YFLAGS = -yvd
 CC = gcc
-CFLAGS =
+CFLAGS = -O2
 
 LFILE = update.l
 YFILE = update.y
 
+OUTBIN = a.out
+ifeq ($(OS),Windows_NT)
+	OUTBIN = a.exe
+endif
+
 default: run
 
 clean:
-	rm -f lex.yy.c y.* a.out query.txt
+	rm -f lex.yy.c y.* $(OUTBIN) query.txt
 
 lex.yy.c: $(LFILE)
 	$(LEX) $(LFLAGS) $(LFILE)
 
 y.tab.c: $(YFILE)
 	$(YACC) $(YFLAGS) $(YFILE)
 
-a.out: lex.yy.c y.tab.c y.tab.h
+createbin: lex.yy.c y.tab.c y.tab.h
 	$(CC) $(CFLAGS) lex.yy.c y.tab.c
 
-build: clean a.out
+build: clean createbin
 
-test: a.out
-	./a.out TEST
+test: createbin
+	./$(OUTBIN) TEST
 
-run: a.out
-	./a.out
+run: createbin
+	./$(OUTBIN)