实验3环境初始化

Makefile里的gdb和之前不一样了！要添加$(QEMUOPTS)，不然会导致没有挂载交换分区。

labcodes_answer/lab3_result/Makefile

@@ -210,7 +210,8 @@ endif
 # files for grade script
 
 TARGETS: $(TARGETS)
-
+targets: $(TARGETS)
+all: $(TARGETS)
 .DEFAULT_GOAL := TARGETS
 
 QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback
@@ -225,7 +226,8 @@ qemu-nox: $(UCOREIMG) $(SWAPIMG)
 	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
-
+gdb: $(UCOREIMG) $(SWAPIMG)
+	$(V)$(QEMU) -S -s -parallel stdio $(QEMUOPTS) -serial null
 debug: $(UCOREIMG) $(SWAPIMG)
 	$(V)$(QEMU) -S -s -parallel stdio $(QEMUOPTS) -serial null &
 	$(V)sleep 2