Support for `armv7-unknown-linux-musl`

[MPThLee]

Problem you are trying to solve

It's bit complicated, but I need armv7 build of rust docker image. But which is not supported for alpine linux image. (Because I'm trying to use docker on 32bit RPi)

So, I tried to find what sources of image and found that Docker image is built from this script which uses rustup.

And also, rustup only supports two musl targets. Because both are Highest host tools support for musl.

Solution you'd like

It's not easy as it is just Tier 2 support. But I'm hoping to see the arm/v7 build on rustup.

Notes

• Hope to support i686-unknown-linux-musl #2984

[Xgames123]

I also want this

[alex]

It looks like right now, this inadvertantly results in a stable-armv7-unknown-linux-gnueabihf toolchain being installed. I'll probably take a look at resolving this.

[rami3l]

@alex armv7-unknown-linux-musl* is currently Tier 2 without Host Tools, do you have plans to promote these targets to Tier 2 with host tools? Because rustup would mean nothing if the host target hasn't reached that tier...

[alex]

Yup.

[alex]

Updating the state here: this target was grandfathered into tier 2, and cannot be promoted to tier 2 with host tools unless it has some dedicated maintainers. I've drafted the MCP here rust-lang/compiler-team#888 but cannot commit to being a maintainer myself.