rust-lang / rust-lang/rust

`assembler label '' cannot be undefined` on Windows ARM

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A-codegen A-LLVM A-LTO C-bug E-needs-mcve I-miscompile O-AArch64 O-windows T-compiler
Dominant language
Rust
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Description

Whenever I try compiling turborepo on Windows ARM, I get the following error when rustc tries to build tokio:

error: assembler label '' can not be undefined

I'd expect this code to compile, since it works fine on other platforms (macOS/Linux/Windows x86).

Meta

rustc --version --verbose:

rustc 1.82.0-nightly (0d634185d 2024-08-29)
binary: rustc
commit-hash: 0d634185dfddefe09047881175f35c65d68dcff1
commit-date: 2024-08-29
host: aarch64-pc-windows-msvc
release: 1.82.0-nightly
LLVM version: 19.1.0
Backtrace

I don't seem to get a backtrace on Windows, even when setting via set RUST_BACKTRACE=1

Here's all I get:

error: assembler label '' can not be undefined
   Compiling hyper v1.4.1
   Compiling console v0.15.7
   Compiling proc-macro-crate v3.1.0
   Compiling async-graphql-parser v7.0.7
   Compiling crossterm v0.27.0
   Compiling turborepo-vercel-api v0.1.0 (C:\Users\nicholas\turbo\crates\turborepo-vercel-api)
   Compiling turborepo-ci v0.1.0 (C:\Users\nicholas\turbo\crates\turborepo-ci)
   Compiling itertools v0.12.0
   Compiling stability v0.1.1
   Compiling lru v0.12.2
   Compiling memoffset v0.7.1
   Compiling encoding_rs v0.8.32
error: could not compile `tokio` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

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Research direction

The report involves rustc 1.82.0-nightly, LLVM 19.1.0, tokio, and the aarch64-pc-windows-msvc target; first reproduce the build on Windows ARM. Trace the compiler or assembler-label path producing the empty-label error, then verify that tokio compiles on this target without regressing the reported working platforms.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers, operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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