build system works using i586-elf cross-compiler in cygwin

git-svn-id: svn://anubis/hos/trunk@13 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/Makefile

@@ -1,16 +1,19 @@
 
-KERNEL = hos
-LDFLAGS = -T link.ld
+KERNEL  := hos
+LDFLAGS := -T link.ld
 
-.PHONY: clean
+.PHONY: all
+all: $(KERNEL).gz
 
-all: $(KERNEL)
+$(KERNEL).gz: $(KERNEL)
+	gzip -c $< > $@
 
 $(KERNEL): boot.o
-	ld $(LDFLAGS) -o $@ $<
+	$(LD) $(LDFLAGS) -o $@ $<
 
 boot.o: boot.asm
-	nasm -f elf -o boot.o boot.asm
+	$(NASM) -f elf -o $@ $<
 
+.PHONY: clean
 clean:
-	-rm -f *~ $(KERNEL) *.o
+	-rm -f *~ $(KERNEL) $(KERNEL).gz *.o