File:  [NetBSD Developer Wiki] / wikisrc / tutorials / pkgsrc / cross_compile_distcc.mdwn
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## Distributing pkgsrc builds across different OSes

You may want to use several machines to speed up your *pkgsrc* builds, but
as those computers are not running NetBSD, you may think they are useless as
build-helpers. This is where enters NetBSD's *cross-compiling* system in
conjuction with [distcc](

### A classic scenario

GNU/Linux is a very common OS you probably have on your network, in this
tutorial, we will focus on how to use a Debian GNU/Linux system as a
*distcc* node, but this procedure can apply to almost any pkgsrc-supported

First things first, your GNU/Linux machine must have the following packages

* gcc
* g++
* zlib1g-dev
* ncurses-base

### Building the cross-compiling chain

Once done, download NetBSD's source tree. For example, if your target is a
NetBSD 5.1.2 system:

	# pwd
	# cvs -d co -rnetbsd-5-1-2-RELEASE src

We will then use the ** script in order to build the tools needed
for cross-compiling:

	# cd src
	# ./ -m amd64 tools

Do *not* use the *-u* flag, as we need to configure *nbcompat* for the tools
to build correctly.

Once finished, you should have a directory like


On the *src* directory. This is where the cross-compiling toolkit resides.

### Installing and configuring distcc

It is mandatory to configure *distcc* so it uses our cross-comping tools to
build binaries for another platform. On a Debian system, this is done in

	# [...]
	# Allowed networks
	# IP where distcc will listen
	# Here's the real trick, supersede $PATH so the firsts binaries
	# distcc will look for are NetBSD's ones

After that, simply start *distcc*

	/etc/init.d/distcc start

### Testing the setup

On a NetBSD machine located in *distcc*'s allowed network, add the following to

	PKGSRC_COMPILER=ccache distcc gcc
	DISTCC_HOSTS= localhost

And fire up the *make* command in a *pkgsrc* subdirectory containing a C-based
package. You should see something like this in helper's */var/log/distccd.log*

	distccd[20634] (dcc_job_summary) client: COMPILE_OK exit:0 sig:0 core:0 ret:0 time:57ms gcc /usr/pkgsrc/misc/tmux/work/.ccache-cache/tmp/unvis.tmp.bulkor.18298.i
	distccd[20734] (dcc_job_summary) client: COMPILE_OK exit:0 sig:0 core:0 ret:0 time:172ms gcc /usr/pkgsrc/misc/tmux/work/.ccache-cache/tmp/imsg-buffe.tmp.bulkor.20945.i
	distccd[20586] (dcc_job_summary) client: COMPILE_OK exit:0 sig:0 core:0 ret:0 time:40ms gcc /usr/pkgsrc/misc/tmux/work/.ccache-cache/tmp/strtonum.tmp.bulkor.4879.i

Of course, you may want to adjust the *MAKE_JOBS* according to the number of
nodes your build-cluster has.

Enjoy your faster builds!

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