On 10/17/2013 07:21 AM, Zhou Zhu wrote:
> So how does the libraries place in the rootfs? like lib/lib64 as in x86/x64?
> Is there any similar rule in arm/arm64 system (whatever
> openebedded/ubuntu/android/...) for that? Like multi arch spec in ubuntu?

OpenEmbedded unfortunately does not support multiarch and when I last asked
about it [1], it didn't sound like there was any intention to add it. I
briefly looked into doing it myself, but I'm just not yet familiar enough with
the internals.

1. http://lists.linaro.org/pipermail/cross-distro/2013-April/000434.html

As Matthias mentioned, the multi-arch paths, assuming /usr squash, are:

/lib/arm-linux-gnueabihf
/lib/aarch64-linux-gnu

I've also toyed with a /bin/$TRIPLET extension to the scheme, but don't yet
have a good solution for scripts with shebang lines.

It would be nice if it were easier to install the binary toolchain releases
into a multi-arch rootfs, but it's been a while since I set everything and I
don't recall the specifics of why it wasn't two straight copy operations. It
would makes things easier if one didn't have to always pass -dynamic-linker
and -rpath settings to get dynamic linking working on multiarch root
filesystems, but at least that works. In my opinion, multiarch is the best
option out there, and I'd love to see improved support for it, but I
understand that there's a lot of work involved, the benefits are mostly for
pretty fringe (or should I say cutting edge?) use cases, and it's tricky to
not break things in the transition.

Regards,
Christopher

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by the Linux Foundation.

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