[beta] backports by cuviper · Pull Request #162987 · rust-lang/rust

cuviper · 2026-09-18T20:23:02Z

Re-export core::fmt::NumBuffer in alloc (and std) Re-export core::fmt::NumBuffer in alloc (and std) #161430
Make VaArgSafe dyn-incompatible Make VaArgSafe dyn-incompatible #162374
Destabilize VaArgSafe Destabilize VaArgSafe #162909
attach global target features to module-level assembly attach global target features to module-level assembly #160594
(partial) compiler-builtins subtree update - compiler-builtins subtree update #162816

r? me

(cherry picked from commit dad850c)

This is done just in case we want to later do stuff like adding a `Sized` supertrait. See discussion at https://rust-lang.zulipchat.com/#narrow/channel/219381-t-libs/topic/Should.20.60VaArgSafe.60.20require.20.60Sized.60.3F/with/622074620 (cherry picked from commit 16529d7)

This PR does a "breaking" change on API that's stabilized in 1.99.0 beta, but has not reached stable yet, so we can make this change. H th is PR will need a beta backport. (cherry picked from commit 246105d)

(cherry picked from commit 5e3ad00)

cuviper · 2026-09-18T21:36:00Z

@bors r+ rollup=never

rust-bors · 2026-09-18T21:36:04Z

📌 Commit 9cd3215 has been approved by cuviper

It is now in the queue for this repository.

tgross35 · 2026-09-19T00:40:47Z

If you're doing backports nowish, mind reviewing #162820? I think it should be fine but also am not too familiar with the process.

(They could probably actually be rolled up together)

(cherry picked from commit 37aaf5c)

This is a rather old config, added in c924aed0b9ac ("Fix Armv8-M Baseline compilation"). `thumb_1` is somewhat misleading, since targets with `thumb2` also support basic `thumb` instructions. Rename it to be more clear about what this is actually checking. The config is not currently used but may be in the future. (cherry picked from commit 5c59263)

We still match on target name because we can't always rely on config from the unstable `arm_target_feature`. However, we can still assert that things match up when running in the compiler-builtins CI. This is disabled for now because it fails on three thumb targets: * thumbv4t-none-eabi * thumbv5te-none-eabi * thumbv6-none-eabi This will be resolved in a future commit. Checking for the verbose build is a good indicator that we are in our CI, rather than any other that might set the `CI` env. (cherry picked from commit 9e5d248)

Fixes: rust-lang#162259 (cherry picked from commit a7f33f3)

(cherry picked from commit 192ea4f)

rust-bors · 2026-09-19T01:07:38Z

⚠️ A new commit 9e8e33c41f835ab1af74f58904742ed56e1c2ce1 was pushed.

This pull request was unapproved.

cuviper · 2026-09-19T01:11:16Z

@bors r+

rust-bors · 2026-09-19T01:11:19Z

📌 Commit 9e8e33c has been approved by cuviper

It is now in the queue for this repository.

Zalathar · 2026-09-19T01:17:23Z

Scheduling: Bump this above other stuff, since beta is a ticking clock.

@bors p=6

[beta] backports - Re-export `core::fmt::NumBuffer` in `alloc` (and `std`) #161430 - Make `VaArgSafe` dyn-incompatible #162374 - Destabilize `VaArgSafe` #162909 - attach global target features to module-level assembly #160594 - (partial) compiler-builtins subtree update - #162816 r? me

rust-log-analyzer · 2026-09-19T04:11:54Z

The job x86_64-msvc-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

tgross35 · 2026-09-19T04:13:21Z

So close

The hosted runner lost communication with the server. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.

@bors retry

rust-bors · 2026-09-19T04:13:24Z

❗ You can only retry pull requests that are approved and have a previously failed auto build.

Hint: There is currently a pending auto build on this PR. To cancel it, run @bors cancel.

rust-bors · 2026-09-19T04:16:58Z

💔 Test for c033dd8 failed: CI. Failed job:

auto - x86_64-msvc-1 (web logs, enhanced plaintext logs)

tgross35 · 2026-09-19T04:18:58Z

@bors retry

[beta] backports - Re-export `core::fmt::NumBuffer` in `alloc` (and `std`) #161430 - Make `VaArgSafe` dyn-incompatible #162374 - Destabilize `VaArgSafe` #162909 - attach global target features to module-level assembly #160594 - (partial) compiler-builtins subtree update - #162816 r? me

rust-bors · 2026-09-19T04:23:50Z

💔 Test for b43b933 failed: CI. Failed job:

auto - aarch64-apple-macos-26-2 (web logs, enhanced plaintext logs)

rust-log-analyzer · 2026-09-19T04:49:06Z

A job failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

tgross35 · 2026-09-19T04:56:24Z

@bors retry spurious

rust-bors · 2026-09-19T08:52:57Z

☀️ Test successful - CI
Approved by: cuviper
Duration: 3h 13m 42s
Pushing aa05936 to beta...

cuviper and others added 5 commits September 18, 2026 13:11

Re-export core::fmt::NumBuffer in alloc (and std)

1ca7757

(cherry picked from commit dad850c)

replace-version-placeholder

fb137e9

Acknowledge "breaking" change

b620368

This PR does a "breaking" change on API that's stabilized in 1.99.0 beta, but has not reached stable yet, so we can make this change. H th is PR will need a beta backport. (cherry picked from commit 246105d)

Claw back VaArgSafe

9cd3215

(cherry picked from commit 5e3ad00)

rustbot assigned cuviper Sep 18, 2026

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 18, 2026

folkertdev and others added 5 commits September 18, 2026 18:02

forward global target features to module-level assembly

80dea6a

(cherry picked from commit 37aaf5c)

c-b: Add aeabi_u(read|write)(4|8) intrinsics.

bc562d5

Fixes: rust-lang#162259 (cherry picked from commit a7f33f3)

build: Fix thumb_1 cfg to include all "thumb but not thumbv2" targets.

9e8e33c

(cherry picked from commit 192ea4f)

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rustbot added A-compiler-builtins Area: compiler-builtins (https://github.com/rust-lang/compiler-builtins) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. labels Sep 19, 2026

cuviper mentioned this pull request Sep 19, 2026

[beta] Backports for compiler-builtins #162820

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Rollup of 18 pull requests #162996

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rust-bors Bot merged commit aa05936 into rust-lang:beta Sep 19, 2026
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