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Now you should have the complete cross-compiler (with C++) support ready. If not, don't bother to continue...

The idea

Use only as little space as necessary. This includes no portage nor gcc install on target system (ipaq). The idea is to fully cross-compile the system for ipaq on a i686 host into a subdir (using the ${ROOT} portage feature) and create a jffs2 image which will be uploaded to the ipaq (later updates will be done over nfs-mounted root).

  • /!\ UPDATE: Now that the handhelds.org 2.6 kernel can boot right from SD, we don't need to bother with creating the jffs2 image.

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The steps

It's best if you write this to a script...

First, we need the tools for cross-compiling... 

emerge crossdev

crossdev --target arm-unknown-linux-gnu

If the above fails, try with safer versions... 

crossdev -t arm-unknown-linux-gnu --g 3.4.6 --l 2.3.6-r3

If this fails complaining kernel headers are too old, do the following quick hack (see [http://forums.gentoo.org/viewtopic-t-452498.html this forum] for more info... 

ln -s /usr/arm-unknown-linux-gnu/usr/include/ /usr/arm-unknown-linux-gnu/include

mkdir /usr/arm-unknown-linux-gnu/usr/arm-unknown-linux-gnu
ln -s /usr/arm-unknown-linux-gnu/lib/ /usr/arm-unknown-linux-gnu/usr/arm-unknown-linux-gnu/lib

Now you should have the complete cross-compiler (with C++) support ready. If not, don't bother to continue...

Prepare the destination directory... 

mkdir /tmp/ipaq

Now, we can start building the target system... 

export ARCH="arm"
export ACCEPT_KEYWORDS="arm"
export CHOST="arm-unknown-linux-gnu"
export CBUILD="i686-pc-linux-gnu"

export CFLAGS="-O2 -pipe"
export CXXFLAGS=${CFLAGS}

export ROOT="/tmp/ipaq"

export USE="-*"

export FEATURES="-distcc"

export CONFIG_PROTECT="-* ${ROOT}/etc"

### Bootstrap ###
USE="bootstrap build" emerge sysvinit
USE="bootstrap build" emerge baselayout
emerge sys-kernel/linux-headers
USE="bootstrap build" emerge sys-libs/glibc

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