mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-11 06:37:57 +00:00
1ae4a0cc34
Migrate the standard library from using the external `cfg_if` crate to
using the now-built-in `cfg_select` macro.
This does not yet eliminate the dependency from
`library/std/Cargo.toml`, because while the standard library itself no
longer uses `cfg_if`, it also incorporates the `backtrace` crate, which
does.
Migration assisted by the following vim command (after selecting the
full `cfg_if!` invocation):
```
'<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e
```
This is imperfect, but substantially accelerated the process. This
prompts for confirmation on the `} else {` since that can also appear
inside one of the arms. This also requires manual intervention to handle
any multi-line conditions.
37 lines
1.3 KiB
Rust
37 lines
1.3 KiB
Rust
//! Run-time feature detection for the Rust standard library.
|
|
//!
|
|
//! To detect whether a feature is enabled in the system running the binary
|
|
//! use one of the appropriate macro for the target:
|
|
//!
|
|
//! * `x86` and `x86_64`: [`is_x86_feature_detected`]
|
|
//! * `arm`: [`is_arm_feature_detected`]
|
|
//! * `aarch64`: [`is_aarch64_feature_detected`]
|
|
//! * `riscv`: [`is_riscv_feature_detected`]
|
|
//! * `mips`: [`is_mips_feature_detected`]
|
|
//! * `mips64`: [`is_mips64_feature_detected`]
|
|
//! * `powerpc`: [`is_powerpc_feature_detected`]
|
|
//! * `powerpc64`: [`is_powerpc64_feature_detected`]
|
|
//! * `loongarch`: [`is_loongarch_feature_detected`]
|
|
//! * `s390x`: [`is_s390x_feature_detected`]
|
|
|
|
#![unstable(feature = "stdarch_internal", issue = "none")]
|
|
#![feature(staged_api, cfg_select, doc_cfg, allow_internal_unstable)]
|
|
#![deny(rust_2018_idioms)]
|
|
#![allow(clippy::shadow_reuse)]
|
|
#![cfg_attr(test, allow(unused_imports))]
|
|
#![no_std]
|
|
#![allow(internal_features)]
|
|
|
|
#[cfg(test)]
|
|
#[macro_use]
|
|
extern crate std;
|
|
|
|
// rust-lang/rust#83888: removing `extern crate` gives an error that `vec_spare>
|
|
#[cfg_attr(feature = "std_detect_file_io", allow(unused_extern_crates))]
|
|
#[cfg(feature = "std_detect_file_io")]
|
|
extern crate alloc;
|
|
|
|
#[doc(hidden)]
|
|
#[unstable(feature = "stdarch_internal", issue = "none")]
|
|
pub mod detect;
|