Kbuild changes since 2.6.21??

[Doug Reiland]

There are some makefiles that look at CONFIG_XXXX variables to make
decisions. For example, drivers/power/Makefile has the following
lines:

ifeq ($(CONFIG_SYSFS),y)
power_supply-objs += power_supply_sysfs.o
endif


If I run make clean or make mrproper, it doesn't see CONFIG_SYSFS set
anymore so it doesn't cleanup power_supply_sysfs.o.

This is for 2.6.25, but I think this use to work for 2.6.21. I am
using drivers/power/Makefile as an example, but I am seeing the same
thing for my driver's Makefile.

Thanks in advance.
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