Skip to content

Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2#155763

Open
cezarbbb wants to merge 1 commit intorust-lang:mainfrom
cezarbbb:promote-thumb-to-tier2
Open

Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2#155763
cezarbbb wants to merge 1 commit intorust-lang:mainfrom
cezarbbb:promote-thumb-to-tier2

Conversation

@cezarbbb
Copy link
Copy Markdown
Contributor

@cezarbbb cezarbbb commented Apr 25, 2026 •
edited by davidtwco
Loading

This PR promotes five Thumb-mode bare-metal Arm targets to Tier 2, joining their Arm-mode counterparts which are already Tier 2:

Thumb-mode target (Tier 3 → Tier 2) Arm-mode counterpart (already Tier 2)
thumbv7a-none-eabi armv7a-none-eabi
thumbv7a-none-eabihf armv7a-none-eabihf
thumbv7r-none-eabi armv7r-none-eabi
thumbv7r-none-eabihf armv7r-none-eabihf
thumbv8r-none-eabihf armv8r-none-eabihf

Note: There is no thumbv8r-none-eabi target because the Cortex-R52 processor always includes an FPU, making a soft-float ABI variant unnecessary.

These Thumb-mode targets generate T32 code by default while their Arm-mode counterparts generate A32 code. They share the same LLVM backend, ABI, and data layout — the only spec differences are the llvm_target string and the description.

See rust-lang/compiler-team#985

@rustbot
Copy link
Copy Markdown
Collaborator

rustbot commented Apr 25, 2026

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

These commits modify compiler targets.
(See the Target Tier Policy.)

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 25, 2026
@rustbot
Copy link
Copy Markdown
Collaborator

rustbot commented Apr 25, 2026

r? @adwinwhite

rustbot has assigned @adwinwhite.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

  • Owners of files modified in this PR: @ehuss, compiler
  • @ehuss, compiler expanded to 74 candidates
  • Random selection from 20 candidates

@cezarbbb cezarbbb mentioned this pull request Apr 25, 2026
Open
3 tasks
@petrochenkov petrochenkov self-assigned this Apr 27, 2026
@petrochenkov
Copy link
Copy Markdown
Contributor

petrochenkov commented Apr 27, 2026

Blocked on rust-lang/compiler-team#985.
@rustbot blocked

@rustbot rustbot added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 27, 2026
@cezarbbb
Copy link
Copy Markdown
Contributor Author

cezarbbb commented Apr 28, 2026

@rustbot ping arm-maintainers
As the T32 and A32 targets share a page in the rustc book, can you continue to be the maintainers of these targets?

@rustbot
Copy link
Copy Markdown
Collaborator

rustbot commented Apr 28, 2026

Error: Only Rust team members can ping teams.

Please file an issue on GitHub at triagebot if there's a problem with this bot, or reach out on #triagebot on Zulip.

@SparrowLii
Copy link
Copy Markdown
Member

SparrowLii commented Apr 28, 2026

@rustbot ping arm-maintainers
:)

@rustbot
Copy link
Copy Markdown
Collaborator

rustbot commented Apr 28, 2026

Error: This team (arm-maintainers) cannot be pinged via this command; it may need to be added to triagebot.toml on the default branch.

Please file an issue on GitHub at triagebot if there's a problem with this bot, or reach out on #triagebot on Zulip.

@thejpster
Copy link
Copy Markdown
Contributor

thejpster commented May 2, 2026

arm-maintainers said yes over on rust-lang/compiler-team#985 (comment) (just for anyone else looking at this without looking at that thread first)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

@petrochenkov petrochenkov

Labels

S-blocked Status: Blocked on something else such as an RFC or other implementation work. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

6 participants

@cezarbbb @rustbot @petrochenkov @SparrowLii @thejpster @adwinwhite