Ubuntu 20.04 无法编译成功

本书推荐使用 Ubuntu 20.04 ，默认安装版本如下
gcc version 8.4.0 (Ubuntu 8.4.0-3ubuntu2)
GNU ld (GNU Binutils for Ubuntu) 2.34

但编译生成129M的system文件，无法通过校验

gcc -m32 -I../include -nostdinc -ffreestanding -fno-pic -Wall -fomit-frame-pointer -fno-stack-protector -c -o _exit.o _exit.c
gcc -m32 -I../include -nostdinc -ffreestanding -fno-pic -Wall -fomit-frame-pointer -fno-stack-protector -c -o setsid.o setsid.c
ar rcs lib.a string.o ctype.o file.o open.o dup.o execve.o close.o wait.o _exit.o setsid.o
sync
make[2]: Leaving directory '/root/linux_kernel_012/lib'
ld -Ttext 0x0 -s --oformat binary -m elf_i386 -e startup_32 -o system head.o main.o sched.o fork.o printk.o sys_call.o vsprintf.o traps.o asm.o sys.o panic.o segment.o mktime.o signal.o exit.o ../fs/fs.o chr_drv/chr_drv.a blk_drv/blk_drv.a ../mm/mm.o ../lib/lib.a -M > System.map
make[1]: Leaving directory '/root/linux_kernel_012/kernel'
./tools/build bootsect setup kernel/system > linux.img
Root device is (2, 29)
Boot sector 512 bytes.
Setup is 380 bytes.
System is 134513368 bytes.
System is too big
make: *** [Makefile:9: linux.img] Error 1

使用CentOS 7
gcc 版本 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)
GNU ld version 2.27-44.base.el7_9.1

一次编译成功
./tools/build bootsect setup kernel/system > linux.img
Root device is (2, 29)
Boot sector 512 bytes.
Setup is 380 bytes.
System is 116609 bytes.

hinus/linux_kernel_012

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