1 files changed, 34 insertions, 0 deletions
diff --git a/library/stdarch/crates/std_detect/src/lib.rs b/library/stdarch/crates/std_detect/src/lib.rs
new file mode 100644
index 000000000..c0e0de0dd
--- /dev/null
+++ b/library/stdarch/crates/std_detect/src/lib.rs
@@ -0,0 +1,34 @@
+//! 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`]
+
+#![unstable(feature = "stdsimd", issue = "27731")]
+#![feature(staged_api, stdsimd, doc_cfg, allow_internal_unstable)]
+#![deny(rust_2018_idioms)]
+#![allow(clippy::shadow_reuse)]
+#![deny(clippy::missing_inline_in_public_items)]
+#![cfg_attr(test, allow(unused_imports))]
+#![no_std]
+
+#[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 = "stdsimd", issue = "27731")]
+pub mod detect;