r193528 - Support cross linking to arm on ubuntu.

[Chandler Carruth]

On Mon, Oct 28, 2013 at 4:21 PM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:

> Sure. Revered in 193554.
>
> So, part of the problem is that it was not clear what the
> x86_64-unknown-linux tree was. It was looking like a mix of different
> systems, so it looked like correct change.
>
> What is the characteristic of the tree that should make us conclude it
> is biarch? The existence of the lib64 directory itself?
>

That is the best metric I have come up with.

Essentially, the pattern I have followed is to assume that all possible
forms of biarch could occur and should be respected. If you create 'lib64',
'lib32' and 'lib', you'll be able to get GCC to search all 3 with variants
of '-m32' and '-m64'. =/
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