Armhf dynamic linker path

Steve McIntyre steve.mcintyre at linaro.org
Wed Apr 11 13:04:08 UTC 2012


On Wed, Apr 11, 2012 at 06:19:38AM -0600, Jeff Law wrote:
>On 04/10/2012 04:42 AM, Steve McIntyre wrote:
>>It's one of the things we're trying to achieve with multi-arch. We can
>>support mixed-ABI, mixed-OS, mixed-architecture environments cleanly
>>on one system, using a consistent set of packages for all. Setting up
>>a cross-compilation environment suddenly becomes easy - install the
>>cross-compiler and the libs for the target platform straight from a
>>normal Debian mirror as binary packages.
>>
>>
>>See http://wiki.debian.org/Multiarch/TheCaseForMultiarch for more
>>rationale.
>I've read it and still don't see the benefit, particularly as it
>relates to mixed instruction sets.  Or more precisely, I don't see
>the value in supporting mixed instruction sets.   Once you drop the
>mixed instruction set argument I think the whole argument for
>embedding the target triplet into the dynamic linker pathname falls
>apart.

We see a value in supporting mixed instruction sets for two cases:
emulation and cross-building. If you don't want or care so much about
those, then fine - that's your call in your environment. They're both
cases that Debian/Ubuntu would like to do a much better job of
supporting in future, using existing packages instead of having to do
so much special-casing all over. I hope that you (plural) can
understand/accept that?

>>We have to agree on a standard path if we're ever going to have
>>working cross-distro binaries, and that's increasingly important to us
>>in the ARM world. By all means ignore the multi-arch route that the
>>Debian world is following, but please accept our reasoning for the
>>linker location.
>But the entire reason behind the need to embed the triplet into the
>dynamic linker's path is the debian multi-arch stuff AFAICT.  I think
>that's what many folks are complaining about.
>
>I realize the goal here is to allow a single binary to run on
>multiple systems and I think that's a worthy goal.

Cool. :-)

Cheers,
-- 
Steve McIntyre                                steve.mcintyre at linaro.org
<http://www.linaro.org/> Linaro.org | Open source software for ARM SoCs




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