Linux内核 ext2 文件系统 makefile详解





# Makefile for the linux ext2-filesystem routines.

obj-$(CONFIG_EXT2_FS) += ext2.o

ext2-y := balloc.o dir.o file.o ialloc.o inode.o \
	  ioctl.o namei.o super.o symlink.o

ext2-$(CONFIG_EXT2_FS_XATTR)	 += xattr.o xattr_user.o xattr_trusted.o
ext2-$(CONFIG_EXT2_FS_POSIX_ACL) += acl.o
ext2-$(CONFIG_EXT2_FS_SECURITY)	 += xattr_security.o
ext2-$(CONFIG_EXT2_FS_XIP)	 += xip.o

1.obj-$(CONFIG_EXT2_FS) += ext2.o  obj- 表示如何编译 y m n分别表示进入内核编译,m 模块编译,n不编译。其中$(CONFIG_EXT2_FS)表示取CONFIG_EXT2_FS值操作,所以ext2的编译方式取决于编译内核是make config时CONFIG_EXT2_FS选定的值。




3.:= 表示赋值操作


4.ext2-y := balloc.o dir.o file.o ialloc.o inode.o \

 ioctl.o namei.o super.o symlink.o 表示ext2.o模块依赖于后面的*.o文件。-y和-objs都表示模块。

5.+= 表示追加方式复值:

objects = main.o foo.o bar.o utils.o

objects += another.o

上边的两个操作之后变量“objects”的值成:“main.o foo.o bar.o utils.o another.o”。使用“+=”操作符,就相当于:

objects = main.o foo.o bar.o utils.o

objects := $(objects) another.o


6.ext2-$(CONFIG_EXT2_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o  表示如果make config步骤中CONFIG_EXT2_FS_XATTR赋值为y,则ext2模块在前面的编译基础上再加上xattr.o xattr_user.o xattr_trusted.o三个文件。


7ext2-$(CONFIG_EXT2_FS_POSIX_ACL) += acl.o

ext2-$(CONFIG_EXT2_FS_SECURITY) += xattr_security.o
ext2-$(CONFIG_EXT2_FS_XIP) += xip.o
# Makefile for the Linux pcmfs filesystem routines.

obj-m += simplefs.o
simplefs-objs := bitmap.o itree_common.o namei.o inode.o file.o dir.o
PWD:=$(shell pwd)
	make -C $(KERNELDIR) M=$(PWD) modules
	rm -rf *.o *.mod.c *.ko *.symvers


2.simplefs-objs := bitmap.o itree_common.o namei.o inode.o file.o dir.o  其中-objs为模块。表示simplefs.o模块依赖后面的文件。

3.KERNELDIR:=/usr/src/linux- 将变量KERNELDIR赋值,为后面提供使用

4.PWD:=$(shell pwd)赋值为当前目录

5.make -C $(KERNELDIR) M=$(PWD) modules

 其中make的 -C表示转换路径,可以再linux下通过man make查看:

        -C dir, --directory=dir

            Change to directory dir before reading the makefiles  or  doing
            anything  else.   If multiple -C options are specified, each is
            interpreted relative to the previous one: -C / -C etc is equiv‐
            alent  to -C /etc.  This is typically used with recursive invo‐
            cations of make.
 其中make M=的含义:M不是make中的选项,而是内核根目录下的makefile中使用的变量。M= dir 程序会自动在所指定的dir目录中查找模块代码,将其编译,生成.ko文件


Category: 文件系统 | Tags: 文件系统;makefile | Read Count: 2294
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