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improve <code>va_arg</code> assembly on arm targets

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open (in progress).

rust-lang/rustnumber 144549

#144549 In rust-lang/rust;

· folkertdev opened on Jul 27, 2025

<code>VaList&lt;'_&gt;</code> does not carry its ABI in its type

A-ABIArea: Concerning the application binary interface (ABI)Area: Concerning the application binary interface (ABI)

C-bugCategory: This is a bug.Category: This is a bug.

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#141618 In rust-lang/rust;

· workingjubilee opened on May 26, 2025

Consider folkertdev's <code>c_variadic</code> proposal

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#141524 In rust-lang/rust;

· traviscross opened on May 24, 2025

Poor interaction between NLL-borrowck, async, and c_variadic's <code>...</code> desugaring (<code>VaListImpl&lt;'_&gt;</code>)

A-async-awaitArea: Async & AwaitArea: Async & Await

AsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#125431 In rust-lang/rust;

· nnethercote opened on May 23, 2024

VaList: Allow VaList::arg to fetch bool values

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#57794 In rust-lang/rust;

· dlrobertson opened on Jan 21, 2019

libcore: Implement VaList::arg in pure rust

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#56489 In rust-lang/rust;

· dlrobertson opened on Dec 4, 2018

Tracking issue for RFC 2137: Support defining C-compatible variadic functions in Rust (c_variadic)

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-c_variadic`#![feature(c_variadic)]``#![feature(c_variadic)]`

S-tracking-ready-to-stabilizeStatus: This is ready to stabilize; it may need a stabilization report and a PRStatus: This is ready to stabilize; it may need a stabilization report and a PR

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#44930 In rust-lang/rust;

· aturon opened on Sep 29, 2017