Patch gcc toolchain (#111)

* 添加了GCC_cross_compile——tool_chain

* - 解决环境变量路径拼接时，多了`/`的问题
- apt安装时增加-y,不需用户确认

* 解决添加环境变量的命令有误的问题

* 修正编译错误时，还会执行下一步的问题

* new: 编译完成后清理临时文件

* 更新makefile

* 调整：把grub安装在 $HOME/opt/dragonos-grub下

* new: 新增dockerfile

* 将镜像源换成中科大的（原因是清华的总是ban掉用于构建镜像的服务器的ip）

* 修改为基于debian bullseye构建

* 取消指定版本

* 修复MBR磁盘镜像未设置启动标志的bug

* 取消在docker中安装grub

* 安装grub的过程改到客户机上进行

* bootstrap.sh 添加--no-docker

* 使用新版的docker编译镜像

* 修补, 添加了一些关于gcc的check

Co-authored-by: longjin <longjin@RinGoTek.cn>

kernel/src/Makefile

@@ -23,7 +23,7 @@ kernel_subdirs := common driver process debug filesystem time arch exception mm
 
 head.o: head.S
 	$(CC) -E head.S > _head.s # 预处理
-	as $(ASFLAGS) -o head.o _head.s
+	$(AS) $(ASFLAGS) -o head.o _head.s
 
 
 main.o: main.c 
@@ -38,7 +38,7 @@ kernel_rust:
 all: kernel
 
 	@echo "Linking kernel..."
-	ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a -T link.lds
+	$(LD) -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a -T link.lds
 # 生成kallsyms
 	current_dir=$(pwd)
 	
@@ -55,10 +55,10 @@ all: kernel
 # 重新链接
 	@echo "Re-Linking kernel..."
 	@echo $(shell find . -name "*.o")
-	ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a ./debug/kallsyms.o  -T link.lds
+	$(LD) -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a ./debug/kallsyms.o  -T link.lds
 	@echo "Generating kernel ELF file..."
 # 生成内核文件
-	objcopy -I elf64-x86-64 -O elf64-x86-64 -R ".comment" -R ".eh_frame" kernel ../../bin/kernel/kernel.elf
+	$(OBJCOPY) -I elf64-x86-64 -O elf64-x86-64 -R ".comment" -R ".eh_frame" kernel ../../bin/kernel/kernel.elf
 	@echo "Kernel Build Done."
 
 ECHO: