linux-kernel - Re: Suggestions request for speed-up kernel compilation

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Message-ID: <20090424103837.GA19132@uranus.ravnborg.org>
Date:	Fri, 24 Apr 2009 12:38:37 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Alessio Igor Bogani <abogani@...ware.it>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Suggestions request for speed-up kernel compilation

On Fri, Apr 24, 2009 at 11:57:35AM +0200, Alessio Igor Bogani wrote:
> Hi All,
> 
> Sorry for my bad English.
> 
> I'm a kernel newbie and I would be very happy to receive some tips
> about kernel compilation from experienced developers.
> 
> I have recently elaborated some trivial patches. For each one I have
> done a build test at minimum and I find myself spend a lot of time
> waiting my Core Duo to accomplish this task. Make is a very smart tool
> but after a git pull or a git fetch origin/git reset --hard origin it
> can't help as desired.
> 
> Unfortunately I don't have a clustered compilation farm under my control. :-)
> 
> Anyone can suggest me how mitigate that issue?
The kernel build system does a good job detecting what to build.
So if you touches a .h file or you change a CONFIG_ symbol used by
a header file you will see a lot of rebuilds - sometimes
more than you expected.

Try to do:

    make V=2

to see why a certain file is rebuild.


If you know you only have to build a single file you can use:

    make kernel/foo.o

If you want to build a directory - including sub-directories:

   make kernel/

If you want to build a specific module use:

    make drivers/net/foobar.ko

make help can give you a few more hints.

And try to avoid "make clean" / "make mrproper" - as this deletes all .o files.

	Sam
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