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Cannot compile std with atomics feature on wasm32-unknown-unknown target #86802
Description
I tried compiling an empty library, created with cargo init --lib, with the following flags:
RUSTFLAGS='-C target-feature=+atomics' cargo +nightly build --target wasm32-unknown-unknown -Z build-std=stdCargo.toml
[package]
name = "wasm-test"
version = "0.1.0"
edition = "2018"
[lib]
crate-type = ["cdylib"]
[dependencies]I expected it to compile properly. Instead, I got the following error:
error[E0252]: the name `unsupported` is defined multiple times
--> /home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/wasm/atomics/thread.rs:5:5
|
1 | use super::unsupported;
| ------------------ previous import of the value `unsupported` here
...
5 | use crate::sys::unsupported;
| ^^^^^^^^^^^^^^^^^^^^^^^ `unsupported` reimported here
|
= note: `unsupported` must be defined only once in the value namespace of this module
Full output
Compiling compiler_builtins v0.1.46
Compiling core v0.0.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
Compiling libc v0.2.93
Compiling cc v1.0.68
Compiling dlmalloc v0.2.1
Compiling std v0.0.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std)
Compiling unwind v0.0.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/unwind)
Compiling rustc-std-workspace-core v1.99.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
Compiling alloc v0.0.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc)
Compiling cfg-if v0.1.10
Compiling adler v0.2.3
Compiling rustc-demangle v0.1.18
Compiling rustc-std-workspace-alloc v1.99.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-alloc)
Compiling panic_abort v0.0.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/panic_abort)
Compiling panic_unwind v0.0.0 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/panic_unwind)
Compiling gimli v0.23.0
Compiling std_detect v0.1.5 (/home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/stdarch/crates/std_detect)
Compiling miniz_oxide v0.4.0
Compiling hashbrown v0.11.0
Compiling object v0.22.0
Compiling addr2line v0.14.0
error[E0252]: the name `unsupported` is defined multiple times
--> /home/thomas/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/wasm/atomics/thread.rs:5:5
|
1 | use super::unsupported;
| ------------------ previous import of the value `unsupported` here
...
5 | use crate::sys::unsupported;
| ^^^^^^^^^^^^^^^^^^^^^^^ `unsupported` reimported here
|
= note: `unsupported` must be defined only once in the value namespace of this module
error: aborting due to previous error
For more information about this error, try `rustc --explain E0252`.
error: could not compile `std`
To learn more, run the command again with --verbose.
Meta
rustc +nightly --version --verbose:
rustc 1.55.0-nightly (7100b311d 2021-07-01)
binary: rustc
commit-hash: 7100b311df0367c4d9067687573d1396b22411df
commit-date: 2021-07-01
host: x86_64-unknown-linux-gnu
release: 1.55.0-nightly
LLVM version: 12.0.1
Activity
Rollup merge of rust-lang#86807 - tversteeg:patch-1, r=bjorn3