写操作系统----11.编译的Makefile

1.1 结构目录

cong@msi:/work/os/code/7int$ tree
.
├── boot
│   ├── loader.S
│   └── mbr.S
├── include
│   ├── interrupt.h
│   ├── io.h
│   ├── print.h
│   ├── stdarg.h
│   └── stdint.h
├── init
│   └── main.c
├── kernel
│   ├── interrupt.c
│   ├── kernel.S
│   └── Makefile        -->每个目录下的Makefile，都编译成一个静态库
├── lib
│   ├── Makefile        -->每个目录下的Makefile，都编译成一个静态库
│   ├── printf.c
│   └── put_char.S
└── Makefile           -->总的Makefile，链接所有的静态库与main.o

1.2 顶层的Makefile

cong@msi:/work/os/code/7int$ cat Makefile
ENTRY_POINT = 0xc0001500
AS = nasm
CC = gcc
CPP =gcc -E -nostdinc -I ./include
LD = ld
INCLUDE = -I ./include
ASFLAGS = -f elf
CFLAGS = -Wall $(INCLUDE) -c -m32 -fno-builtin -W -Wstrict-prototypes -Wmissing-prototypes -nostdinc
LDFLAGS = -Ttext $(ENTRY_POINT) -m elf_i386 -e main -Map System.map
LIBS = lib/lib.a
KERNEL= kernel/kernel.a

all: mbr.bin loader.bin init/kernel.bin
mbr.bin:
    $(AS) ./boot/mbr.S -I ./boot/include/ -o ./boot/mbr.bin
loader.bin:
    $(AS) ./boot/loader.S -I ./boot/include/ -o ./boot/loader.bin
init/kernel.bin: init/main.o $(KERNEL) $(LIBS)
    $(LD) $(LDFLAGS) -o $@ $^         -->把各个目录下的库都链接在一起

init/main.o: init/main.c
    $(CC) $(CFLAGS) -c -o $*.o $<

$(KERNEL):
    (cd kernel; make)
$(LIBS):
     (cd lib; make)

clean:
    -rm /work/os/code/disk.img ./boot/mbr.bin ./boot/loader.bin init/kernel.bin
    -rm -f Image System.map tmp_make core
    -rm -f init/*.o boot/*.o
    (cd kernel;make clean)
    (cd lib;make clean)

flash:
    -rm /work/os/code/disk.img
    dd if=/dev/zero of=/work/os/code/disk.img bs=1M count=30
    dd if=./boot/mbr.bin of=/work/os/code/disk.img bs=512 count=1 conv=notrunc
    dd if=./boot/loader.bin of=/work/os/code/disk.img bs=512 count=5 seek=2 conv=notrunc
    dd if=./init/kernel.bin of=/work/os/code/disk.img bs=512 count=200 seek=9 conv=notrunc
show:
    echo "show loader.bin"
    xxd ./loader.bin
    echo "show disk.img"
    xxd -seek 0x400 -l 0x200 /work/os/code/disk.img
dep:                     -->这个dep是从linux0.11里面抄来的
    sed '/\#\#\# Dependencies/q' < Makefile > tmp_make
    (for i in init/*.c;do echo -n "init/";$(CPP) -M $$i;done) >> tmp_make
    cp tmp_make Makefile
    (cd kernel; make dep)
    (cd lib; make dep)

1.2.a 说明
规则里面有三部分: mbr.bin loader.bin init/kernel.bin 
其中mbr.bin loader.bin 以后就不用再动了
只需要init/kernel.bin需要改动


1.3 每个目录下的Makefile

cong@msi:/work/os/code/7int$ cat lib/Makefile
AS = nasm
CC = gcc
CPP =gcc -E -nostdinc -I ../include
LD = ld
INCLUDE= -I ../include
ASFLAGS = -f elf
CFLAGS = -Wall $(INCLUDE) -c -m32 -fno-builtin -W -Wstrict-prototypes -Wmissing-prototypes -nostdinc
LDFLAGS = -m elf_i386

TARGET = lib.a
OBJS= put_char.o  printf.o      -->以后直接在这儿添加就行了

.c.o:
    $(CC) $(CFLAGS) -c -o $*.o $<
.S.o:
    $(AS) $(ASFLAGS) -o $*.o $<

all: $(TARGET)
$(TARGET):$(OBJS)
    $(AR) rcs $(TARGET) $(OBJS)          -->把该目录下的所有目标文件都打包成库，然后在顶层的Makefile中链接成kernel.bin
clean:
    rm -f core *.o *.a tmp_make
    for i in *.c;do rm -f `basename $$i .c`.s;done

dep:             -->这个dep是从linux0.11里面抄来的
    sed '/\#\#\# Dependencies/q' < Makefile > tmp_make
    (for i in *.c;do $(CPP) -M $$i;done) >> tmp_make
    cp tmp_make Makefile

1.3.a 说明 
以后新添加文件进行编译时，如要在lib下添加test.c, 只需要OBJS里面加入test.o就可以了，其它的都不用动
1.4 代码打包
7int_Makefile.rar (下载后改名为7int_Makefile.tar.gz)