Add cross build targeting Redox to Travis CI

[ids1024]

It is helpful to make sure things are building on Redox, though It's understandable if you don't want Redox breaking CI.

I ran cargo update since Redox required newer versions of a dependency or two.

[nathanross]

@ids1024 Can you clarify what part of this is breaking the CI, and why fixing it is not achievable? I can dig through this later today and take a look on the "why" myself, but the second question would be better answered by you. Thanks!

[ids1024]

It looks like the cargo update bumped clap, which changed some messages slightly; I don't know if that's the only issue.

[Arcterus]

I think adding this is a good idea, but maybe we should allow the Redox build to fail for now?

[ids1024]

maybe we should allow the Redox build to fail for now?

That seems reasonable.

[Arcterus]

@ids1024 can you rebase this?

[ids1024]

I rebased, but there seem to be some test failures. I think it's due to changes to the CI environment caused by adding sudo: true (which was necessary to install Debian packages, specifically the Redox toolchain).

[Arcterus]

I think those failures were already present due to changes in the standard library. Thanks for rebasing!

[ids1024]

Ah, I hadn't checking if they were happening on master. Thanks, this should be helpful to have, as Redox is currently working on moving to using uutils more.

[Arcterus]

Oh nice, that's great to hear!

[jackpot51]

Yep, the BINS variable here https://github.com/redox-os/cookbook/blob/master/recipes/uutils/recipe.sh identifies which programs we are currently using from uutils. We will continue to contribute to port others.

[Arcterus]

Let us know if you run into any issues and we’ll try to fix them quickly. :)

[jackpot51]

Good to hear XD