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Date: Tue, 27 Dec 2011 07:51:01 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Rajneesh Kumar <iwc2010005@gmail.com>
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	(wonkity.com [127.0.0.1]); Tue, 27 Dec 2011 07:51:01 -0700 (MST)
Cc: freebsd-net@freebsd.org
Subject: Re: Compiling only "network" part of the kernel
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On Tue, 27 Dec 2011, Rajneesh Kumar wrote:

> During my development, I want to check if my modules compile successfully
> or not. I am only changing the ARP portion and whenever I compile my
> kernel, it takes around 20mins and compiles all different modules also.
> I just want to compile and check whether my ARP modules, which I have
> changed, compile fine or not. How to do it?

Others have mentioned ways to reduce what is rebuilt.  devel/ccache can 
be used in combination with those.  Even by itself it ought to 
seriously reduce kernel compile time.