build docs for tier 2 armv7a-none-eabi

[robamu]

No description provided.

[jonathanpallant]

I guess we need to publish to know if it's worked?

[robamu]

I think the build failed because on a tier 3 target, the core library needs to be built.
MSP430-rt has a similar issue and build the core lib for docs.rs:

https://github.com/rust-embedded/msp430-rt/blob/master/Cargo.toml#L30

Unfortunately, this needs to be tested with a new release, yes.. should I bump the patch number in this PR as well?

Also, I wonder: Why is armv7a-none-eabihf, which is probably a lot more relevant than armv7-none-eabi (all cortex-a processors have a FPU after all), tier 3 while armv7-none-eabi is tier 2?

[jonathanpallant]

Historical accident I guess. Or home-brew kernel people are allergic to FPUs because context switching or something. See https://github.com/thejpster/rust/tree/promote-armv7a-none-eabihf.

[robamu]

Ohh, that's good to know.

I skimmed https://doc.rust-lang.org/beta/rustc/target-tier-policy.html#tier-2-target-policy . Does this somehow have to be integrated into the rustc CI?

[jonathanpallant]

Infra will do that I think. Or someone will tell me how to do it when I open the PR. It needs to be added to rustup too.

[jonathanpallant]

This is fine - can you do the release? In theory it's just a cargo publish and then a git tag and a git push --tags.

[jonathanpallant]

nice - that worked