How to rebuild only changed files?

[Wolf]

Hello,

I would like to ask about some tips for developing the busybox.
Currently I just

	make defconfig
	make -j8

which seems to work fine and produces busybox binary. However, making
tiny change to findutils/grep.c (in my case) and running the make again,
it rebuilds *lots* of stuff. I would expect to rebuild just the
findutils/grep.o and then do some linking.

And my question is, is something I'm doing wrong? Should I define some
flags somewhere or build some specific target for the make? Or busybox's
makefile does not support incremental build like this?



Thank you for your time,
W.

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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