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<code>#[thread_local]</code>s are pessimized in <code>#[no_mangle]</code> functions

A-codegenArea: Code generationArea: Code generation

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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

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.

#136042 In rust-lang/rust;

· purplesyringa opened on Jan 25, 2025

<code>#[thread_local]</code> alignment broken on Windows, GNU ABI

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

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

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

O-windows-gnuToolchain: GNU, Operating system: WindowsToolchain: GNU, Operating system: Windows

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.

#135719 In rust-lang/rust;

· purplesyringa opened on Jan 19, 2025

#[thread_local] + #[no_mangle] produces a "symbol already defined" error on Windows targets

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

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

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

O-windowsOperating system: WindowsOperating system: Windows

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.

#134939 In rust-lang/rust;

· saethlin opened on Dec 30, 2024

<code>STATUS_ACCESS_VIOLATION</code> in unstable <code>thread_local</code> feature on <code>windows-gnu</code>

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

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

O-windows-gnuToolchain: GNU, Operating system: WindowsToolchain: GNU, Operating system: Windows

Status: Open.

#100917 In rust-lang/rust;

· uselessgoddess opened on Aug 23, 2022

Check target definitions to see if more should have <code>cfg(target_thread_local)</code> enabled.

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

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

O-dragonflyOperating system: DragonFly BSDOperating system: DragonFly BSD

O-freebsdOperating system: FreeBSDOperating system: FreeBSD

O-netbsdOperating system: NetBSDOperating system: NetBSD

O-openbsdOperating system: OpenBSDOperating system: OpenBSD

O-windows-gnuToolchain: GNU, Operating system: WindowsToolchain: GNU, Operating system: Windows

Status: Open.

#91659 In rust-lang/rust;

· thomcc opened on Dec 8, 2021

<code>#[global_allocator]</code> and <code>#[thread_local]</code> should not be usable together on the same <code>static</code>

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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

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

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.

#85517 In rust-lang/rust;

· repnop opened on May 20, 2021

<code>#[thread_local] static mut</code> is allowed to have <code>'static</code> lifetime

A-NLLArea: Non-lexical lifetimes (NLL)Area: Non-lexical lifetimes (NLL)

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

NLL-soundWorking towards the "invalid code does not compile" goalWorking towards the "invalid code does not compile" goal

P-mediumMedium priorityMedium priority

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.

#54366 In rust-lang/rust;

· nikomatsakis opened on Sep 19, 2018

Keeping references to #[thread_local] statics is allowed across yields.

A-borrow-checkerArea: The borrow checkerArea: The borrow checker

A-coroutinesArea: CoroutinesArea: Coroutines

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

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

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

P-mediumMedium priorityMedium priority

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

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

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.

#49682 In rust-lang/rust;

· eddyb opened on Apr 5, 2018

Tracking issue for <code>thread_local</code> stabilization

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

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

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-thread_local`#![feature(thread_local)]``#![feature(thread_local)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

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

Status: Open.

#29594 In rust-lang/rust;

· aturon opened on Nov 5, 2015