android cross builds are failing on CI with nightly rust

[astraw]

Android cross builds are failing on CI with nightly rust. This started between build 351 and build 352 (the macOS failures were another unrelated issue #72 which has now been solved).

The key error from the CI logs seems to be:

aarch64-linux-android/bin/ld: cannot find -lunwind

[Kijewski]

My first instinct was that cross-rs accidentally uploaded a faulty docker image, but no Android image was touched in quite some time: https://github.com/orgs/cross-rs/packages?tab=packages&q=android, so that's not it.

But it looks like only nightly is affected. Could the error be related to rust-lang/rust#103175?

[astraw]

I agree that I think the issue is nothing with changes introduced in our repository but rather that rustc nightly or cross during that time. I don't understand enough about the build process to know whether the issue you linked might be relevant. If nothing with cross changed, then indeed I think the issue is something to do with a recent rustc nightly starting about 10 October.

[astraw]

I think rust-lang/rust#103673 is relevant here. I'm not familiar with the android development, so this is mostly beyond me.