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Function alignment does not work on wasm

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

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.

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

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

O-wasmTarget: WASM (WebAssembly), http://webassembly.org/Target: WASM (WebAssembly), http://webassembly.org/

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#143368 In rust-lang/rust;

· RalfJung opened on Jul 3, 2025

error out when <code>repr(align)</code> exceeds COFF limit

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

I-lang-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

P-lang-drag-2Lang team prioritization drag level 2.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.Lang team prioritization drag level 2.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.

S-waiting-on-t-langStatus: Awaiting decision from T-langStatus: Awaiting decision from T-lang

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open (in progress).

rust-lang/rustnumber 142638

#142638 In rust-lang/rust;

· nthery opened on Jun 17, 2025

rustdoc: Feature request: Also render the alignment under <code>--show-type-layout</code>

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-rustdoc-type-layoutArea: `rustdoc --show-type-layout` (nightly-only)Area: `rustdoc --show-type-layout` (nightly-only)

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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

Status: Open.

#137648 In rust-lang/rust;

· solarretrace opened on Feb 26, 2025

16k-aligned statics crash rustc on Windows

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

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.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

E-needs-investigationCall for partcipation: This issues needs some investigation to determine current statusCall for partcipation: This issues needs some investigation to determine current status

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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.

#135752 In rust-lang/rust;

· purplesyringa opened on Jan 20, 2025

Suggestion: debug-assert that the allocator returns aligned memory

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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.

#131189 In rust-lang/rust;

· emilk opened on Oct 3, 2024

Internal SIMD layout specification is not flexible enough for SPIR-V

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

A-SIMDArea: SIMD (Single Instruction Multiple Data)Area: SIMD (Single Instruction Multiple Data)

PG-portable-simdProject group: Portable SIMD (https://github.com/rust-lang/project-portable-simd)Project group: Portable SIMD (https://github.com/rust-lang/project-portable-simd)

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.

#130405 In rust-lang/rust;

· fu5ha opened on Sep 15, 2024

When a type is <code>#[repr(simd)]</code>, <code>#[repr(align(N))]</code> annotations are ignored.

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

A-SIMDArea: SIMD (Single Instruction Multiple Data)Area: SIMD (Single Instruction Multiple Data)

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

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.

Bug

#130402 In rust-lang/rust;

· fu5ha opened on Sep 15, 2024

#[repr(align(N))] fields not allowed in #[repr(packed(M&gt;=N))] structs

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

A-repr-packedArea: the naughtiest reprArea: the naughtiest repr

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

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

Status: Open.

#100743 In rust-lang/rust;

· asahilina opened on Aug 19, 2022

Tracking Issue for <code>#[align(...)]</code> on function items (fn_align)

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-rust-for-linuxRelevant for the Rust-for-Linux projectRelevant for the Rust-for-Linux project

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

S-tracking-needs-summaryStatus: It's hard to tell what's been done and what hasn't! Someone should do some investigation.Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation.

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#82232 In rust-lang/rust;

· repnop opened on Feb 17, 2021

repr(C, align) is unsound on enums

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-enumArea: Enums (discriminated unions, or more generally ADTs (algebraic data types))Area: Enums (discriminated unions, or more generally ADTs (algebraic data types))

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#82101 In rust-lang/rust;

· mahkoh opened on Feb 14, 2021

Aligned-in-packed restriction can be circumvented with generic parameters

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-repr-packedArea: the naughtiest reprArea: the naughtiest repr

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

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#80926 In rust-lang/rust;

· mahkoh opened on Jan 11, 2021

Statics aligned to greater than a page cause linker error

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

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

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.

#70144 In rust-lang/rust;

· retep998 opened on Mar 19, 2020