Can't install thumbv7neon-unknown-linux-musleabihf

[hkBst]

Verification

• I searched for recent similar issues at https://github.com/rust-lang/rustup/issues?q=is%3Aissue+is%3Aopen%2Cclosed and found no duplicates.
• I am on the latest version of Rustup according to https://github.com/rust-lang/rustup/tags and am still able to reproduce my issue.

Problem

I tried to install thumbv7neon-unknown-linux-musleabihf:

$ rustup target add thumbv7neon-unknown-linux-musleabihf
error: toolchain 'nightly-aarch64-unknown-linux-gnu' does not support target 'thumbv7neon-unknown-linux-musleabihf'
note: you can see a list of supported targets with `rustc --print=target-list`
note: if you are adding support for a new target to rustc itself, see https://rustc-dev-guide.rust-lang.org/building/new-target.html

but

$ rustc --print=target-list | grep neon
thumbv7neon-linux-androideabi
thumbv7neon-unknown-linux-gnueabihf
thumbv7neon-unknown-linux-musleabihf

Rustup version

1.28.2

Installed toolchains

Default host: aarch64-unknown-linux-gnu
rustup home:  /home/gh-hkBst/.rustup

installed toolchains
--------------------
stable-aarch64-unknown-linux-gnu
nightly-aarch64-unknown-linux-gnu (active, default)
nightly-2025-01-16-aarch64-unknown-linux-gnu
nightly-2025-05-31-aarch64-unknown-linux-gnu
nightly-2025-06-26-aarch64-unknown-linux-gnu
rust_stage1
rust_stage2

active toolchain
----------------
name: nightly-aarch64-unknown-linux-gnu
active because: it's the default toolchain
installed targets:
  aarch64-unknown-linux-gnu
  thumbv7neon-linux-androideabi
  thumbv7neon-unknown-linux-gnueabihf

OS version

Linux

[djc]

It's a tier 3 target, so no host tools are available for it:

https://doc.rust-lang.org/nightly/rustc/platform-support.html#tier-3

[rami3l]

@hkBst Sorry for the bad experience!

It's a tier 3 target, so no host tools are available for it

@djc I believe it's rather not about the lack of host tools for tier 3 in this case (@hkBst, according to the logs, uses aarch64-unknown-linux-gnu as the host), but the lack of any reliable officially prebuilt artifacts for tier 3 targets. This means that rustup simply cannot be used to install the target support in question to your toolchains until https://github.com/rust-lang/rust until it gets promoted to tier 2.

Given that there aren't many things that we can do about it, I'm closing this issue as won't fix.

For general directions on compiling tier 3 support from source, see: https://doc.rust-lang.org/nightly/rustc/platform-support/armv7-sony-vita-newlibeabihf.html#building-the-target (replace armv7-sony-vita-newlibeabihf with your target).

[hkBst]

Thanks @rami3l, that explains it.

Perhaps something can still be done about the suboptimal self-contradictory error message?

[rami3l]

Perhaps something can still be done about the suboptimal self-contradictory error message?

@hkBst Yes, such an issue is on our roadmap already: #4006