[yocto] Personalized SDKPATH and sysroot

[Bertrand Roussel]

Hi all,

I'm currently playing with Yocto 1.4, and I have few questions about
generated SDKs.

1/ The sysroot seems to be hardcoded in binaries, for instance:
$
/opt/poky/1.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/armv6-vfp-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc
--print-sysroot
/opt/poky/1.4.2/sysroots/armv6-vfp-poky-linux-gnueabi

$ ./poky-eglibc-x86_64-arm-toolchain-1.4.1.sh
Enter target directory for SDK (default: /opt/poky/1.4.2): /tmp/pokysdk
You are about to install the SDK to "/tmp/pokysdk". Proceed[Y/n]?
Extracting SDK...done
Setting it up...done
SDK has been successfully set up and is ready to be used.
$
/tmp/pokysdk/sysroots/x86_64-pokysdk-linux/usr/bin/armv6-vfp-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc
--print-sysroot
/opt/poky/1.4.2/sysroots/armv6-vfp-poky-linux-gnueabi

There is a 'relocate_sdk.py', is it meant to replace this path (it does
look like it) ?
It's replacing some lib-related paths, but the sysroot is kept intact,
enforcing the use of --sysroot to use the toolchain.

Did I miss something ?

2/ I'm using the 'poky' distribution, which specifies the SDKPATH (in
meta-yocto/conf/distro/poky.conf ) as "/opt/${DISTRO}/${SDK_VERSION}".
Is there a way to override this without making a new distribution
inheriting 'poky' ?

I tried to make a new toolchain recipe based on meta-toolchain, and set the
value there, but only a small part of the toolchain ends up in that
directory (gcc for instance, is compiled with the value set in the
poky.conf ).

Thanks!
Bertrand
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