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Rollup merge of #146523 - thejpster:demote-armebv7r-targets, r=jackh726

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Demote both armebv7r-none-* targets.

OK, slightly more controversial than https://github.com/rust-lang/rust/pull/146520 and https://github.com/rust-lang/rust/pull/146522  - I'd like to drop the bare-metal **big-endian** Armv7-R targets down to Tier 3.

The reason is simple - we cannot test them in https://github.com/rust-embedded/cortex-ar/. This because QEMU support for Big Endian Armv7-R is broken. I tried quite hard, but all the strings I printed with semihosting came out byte swapped (or "etybawa depp") because of how QEMU kludges the access to memory in big-endian mode.

The target also has only a single maintainer. Although, if ````@chrisnc```` wants to put up a case for keeping it at Tier 2 though, I'm happy to hear it!

This PR wil be rebased once https://github.com/rust-lang/rust/pull/146419 completes the queue.
This commit is contained in:
Matthias Krüger 2025-09-26 18:11:09 +02:00 • committed by GitHub
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2
compiler/rustc_target/src/spec/targets/armebv7r_none_eabi.rs
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@ -12,7 +12,7 @@ pub(crate) fn target() -> Target {
llvm_target: "armebv7r-none-eabi".into(),
metadata: TargetMetadata {
description: Some("Bare Armv7-R, Big Endian".into()),
tier: Some(2),
tier: Some(3),
host_tools: Some(false),
std: Some(false),
},

2
compiler/rustc_target/src/spec/targets/armebv7r_none_eabihf.rs
View file

@ -12,7 +12,7 @@ pub(crate) fn target() -> Target {
llvm_target: "armebv7r-none-eabihf".into(),
metadata: TargetMetadata {
description: Some("Bare Armv7-R, Big Endian, hardfloat".into()),
tier: Some(2),
tier: Some(3),
host_tools: Some(false),
std: Some(false),
},

4
src/doc/rustc/src/platform-support.md
View file

@ -156,8 +156,6 @@ target | std | notes
`arm-unknown-linux-musleabi` | ✓ | Armv6 Linux with musl 1.2.3
`arm-unknown-linux-musleabihf` | ✓ | Armv6 Linux with musl 1.2.3, hardfloat
[`arm64ec-pc-windows-msvc`](platform-support/arm64ec-pc-windows-msvc.md) | ✓ | Arm64EC Windows MSVC
[`armebv7r-none-eabi`](platform-support/armebv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian
[`armebv7r-none-eabihf`](platform-support/armebv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian, hardfloat
[`armv5te-unknown-linux-gnueabi`](platform-support/armv5te-unknown-linux-gnueabi.md) | ✓ | Armv5TE Linux (kernel 4.4+, glibc 2.23)
`armv5te-unknown-linux-musleabi` | ✓ | Armv5TE Linux with musl 1.2.3
[`armv7-linux-androideabi`](platform-support/android.md) | ✓ | Armv7-A Android
@ -283,6 +281,8 @@ target | std | host | notes
[`arm64e-apple-ios`](platform-support/arm64e-apple-ios.md) | ✓ | | ARM64e Apple iOS
[`arm64e-apple-tvos`](platform-support/arm64e-apple-tvos.md) | ✓ | | ARM64e Apple tvOS
[`armeb-unknown-linux-gnueabi`](platform-support/armeb-unknown-linux-gnueabi.md) | ✓ | ? | Arm BE8 the default Arm big-endian architecture since [Armv6](https://developer.arm.com/documentation/101754/0616/armlink-Reference/armlink-Command-line-Options/--be8?lang=en).
[`armebv7r-none-eabi`](platform-support/armebv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian
[`armebv7r-none-eabihf`](platform-support/armebv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian, hardfloat
[`armv4t-none-eabi`](platform-support/armv4t-none-eabi.md) | * | | Bare Armv4T
`armv4t-unknown-linux-gnueabi` | ? | | Armv4T Linux
[`armv5te-none-eabi`](platform-support/armv5te-none-eabi.md) | * | | Bare Armv5TE

2
src/doc/rustc/src/platform-support/armebv7r-none-eabi.md
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@ -1,6 +1,6 @@
# `armebv7r-none-eabi` and `armebv7r-none-eabihf`
* **Tier: 2**
* **Tier: 3**
* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
Bare-metal target for CPUs in the Armv7-R architecture family running in Big