linux-kernel - Re: Faster way to run through building single modules

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Date:	Tue, 11 Mar 2008 20:39:31 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Sam Ravnborg <sam@...nborg.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Faster way to run through building single modules


On Feb 10 2008, Sam Ravnborg and Jan Engelhardt wrote:

>>>> I was wondering whether there is a shortcut in kbuild I can take if I 
>>>> just want to rebuild one module. Currently, I have:
>>>> 
>>>> make net/bridge/netfilter/ebtables.ko
>>>
>>>Fool kbuild to think this is an external module using:
>>>make M=`pwd` net/bridge/netfilter/ebtables.ko
>>>
>>>That should do the trick.
>>
>>How would I combine that with O=? Not quite doing the right thing yet.
>>
>>linux$ touch net/bridge/netfilter/ebtables.c 
>>linux$ make O=/home/jengelh/Coding/linux-obj M=$PWD
>>       net/bridge/netfilter/ebtables.ko
>
>O=tells where to find the kernel output files.
>We do not have a possibility to do so for external
>modules - so they will alwys build in same dir as the source.
>
>Bad luck :-(

I just noticed that with v2.6.25-rc3-302-g03923eb, running
make builds the final .ko really quick. Maybe there has been
some magic added that skips a lot of directories, but the
process certainly takes less than 120 seconds, so I am happy.

Previously, it seemed to have visited lots of directories
(even though we know make is not called recursively in 2.6)
before it printed "Building modules stage 2" for the first time.

Nice :)
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