std: Stabilize the thread_local_const_init feature
#91355
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This commit is intended to follow the stabilization disposition of the FCP that has now finished in rust-lang#84223. This stabilizes the ability to flag thread local initializers as `const` expressions which enables the macro to generate more efficient code for accessing it, notably removing runtime checks for initialization. More information can also be found in rust-lang#84223 as well as the tests where the feature usage was removed in this PR. Closes rust-lang#84223
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…askrgr Rollup of 6 pull requests Successful merges: - rust-lang#89642 (environ on macos uses directly libc which has the correct signature.) - rust-lang#90022 (Explain why `Self` is invalid in generic parameters) - rust-lang#90023 (Postpone the evaluation of constant expressions that depend on inference variables) - rust-lang#91215 (Implement VecDeque::retain_mut) - rust-lang#91355 (std: Stabilize the `thread_local_const_init` feature) - rust-lang#91528 (LLVM support .insn directive) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Probably can't be included any time soon, as this requires Rust 1.59. rust-lang/rust#91355 (comment)
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These don't require an initialization check on every access, which should at least be useful for the `CURRENT_STATE` `thread_local!` in `tracing-core`. Probably can't be included any time soon, as this requires Rust 1.59: rust-lang/rust#91355 (comment).
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This enables more efficient code -- stabilized in rust-lang/rust#91355.
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1027: Use const-TLS for the `WorkerThread` pointer (MSRV 1.59) r=cuviper a=cuviper This enables more efficient code -- stabilized in rust-lang/rust#91355. Co-authored-by: Josh Stone <cuviper@gmail.com>
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…d, r=thomcc
Document `const {}` syntax for `std::thread_local`.
It exists and is pretty cool. More people should use it.
It was added in rust-lang#83416 and stabilized in rust-lang#91355 with the tracking issue rust-lang#84223.
This was referenced Jan 7, 2024
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This commit is intended to follow the stabilization disposition of the
FCP that has now finished in #84223. This stabilizes the ability to flag
thread local initializers as
constexpressions which enables the macroto generate more efficient code for accessing it, notably removing
runtime checks for initialization.
More information can also be found in #84223 as well as the tests where
the feature usage was removed in this PR.
Closes #84223