現象
從 svn 倉庫check out 一份內核， 然後make (該配置內置了initramfs 文件系統)，第一次make 成功， 但是此後再也不行了！make , make clean 等後都會出錯。給開發帶來極大麻煩。
出錯信息如下：
20081007_kernel>make
CHK include/linux/version.h
make[1]:`include/asm-arm/mach-types.h' is up to date.
CHK include/linux/utsrelease.h
CHK include/linux/compile.h
/home/zjujoe/svn/mhlv_2.6/working/songlixin/20081007_kernel/usr/Makefile:41:*** multiple target patterns. Stop.
make: *** [usr] Error2
20081007_kernel>make clean
CLEAN arch/arm/boot/compressed
CLEAN arch/arm/boot
CLEAN /home/zjujoe/svn/mhlv_2.6/working/songlixin/20081007_kernel
CLEAN arch/arm/kernel
CLEAN drivers/char
CLEAN init
CLEAN lib
/home/zjujoe/svn/mhlv_2.6/working/songlixin/20081007_kernel/usr/Makefile:41:*** multiple target patterns. Stop.
make: *** [_clean_usr] Error2
20081007_kernel>makedistclean
/home/zjujoe/svn/mhlv_2.6/working/songlixin/20081007_kernel/usr/Makefile:41:*** multiple target patterns. Stop.
make: *** [_clean_usr] Error2
問題解決
(同時打算再仔細研究一下 Makefile 語法:P)
google 了一下， 查到文檔:
http://www.ibm.com/developerworks/cn/linux/l-debugmake.html
該文檔說make 時使用 -d 參數可以看到大量信息， 試着用 make–d, 最後幾行：
This program built fori486-pc-linux-gnu
Reading makefiles...
Reading makefile`scripts/Makefile.build'...
Reading makefile`include/config/auto.conf' (search path) (don't care) (no ~expansion)...
Reading makefile`scripts/Kbuild.include' (search path) (no ~expansion)...
Reading makefile`/home/zjujoe/svn/mhlv_2.6/working/songlixin/20081007_kernel/usr/Makefile'(search path) (no ~ expansion)...
Reading makefile`usr/.initramfs_data.cpio.gz.d' (search path) (no ~expansion)...
/home/zjujoe/svn/mhlv_2.6/working/songlixin/20081007_kernel/usr/Makefile:41:*** multiple target patterns. Stop.
Reaping losing child 0x080af520PID 6349
make: *** [usr] Error2
Removing child 0x080af520 PID6349 from chain.
看一下，usr/.initramfs_data.cpio.gz.d 爲initramfs 的目錄列表，
試着刪除文件 usr/.initramfs_data.cpio.gz.d 再 Make, 居然不出錯了！！！
20081007_kernel>rm -fusr/.initramfs_data.cpio.gz.d
20081007_kernel>make
CHK include/linux/version.h
make[1]:`include/asm-arm/mach-types.h' is up to date.
CHK include/linux/utsrelease.h
CHK include/linux/compile.h
MODPOSTvmlinux
Kernel:arch/arm/boot/Image is ready
Kernel:arch/arm/boot/zImage is ready
Building modules, stage2.
MODPOST 33modules