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diff --git a/library/std/src/sys/mod.rs b/library/std/src/sys/mod.rs
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+//! Platform-dependent platform abstraction.
+//!
+//! The `std::sys` module is the abstracted interface through which
+//! `std` talks to the underlying operating system. It has different
+//! implementations for different operating system families, today
+//! just Unix and Windows, and initial support for Redox.
+//!
+//! The centralization of platform-specific code in this module is
+//! enforced by the "platform abstraction layer" tidy script in
+//! `tools/tidy/src/pal.rs`.
+//!
+//! This module is closely related to the platform-independent system
+//! integration code in `std::sys_common`. See that module's
+//! documentation for details.
+//!
+//! In the future it would be desirable for the independent
+//! implementations of this module to be extracted to their own crates
+//! that `std` can link to, thus enabling their implementation
+//! out-of-tree via crate replacement. Though due to the complex
+//! inter-dependencies within `std` that will be a challenging goal to
+//! achieve.
+
+#![allow(missing_debug_implementations)]
+
+cfg_if::cfg_if! {
+    if #[cfg(target_os = "vxworks")] {
+        mod vxworks;
+        pub use self::vxworks::*;
+    } else if #[cfg(unix)] {
+        mod unix;
+        pub use self::unix::*;
+    } else if #[cfg(windows)] {
+        mod windows;
+        pub use self::windows::*;
+    } else if #[cfg(target_os = "cloudabi")] {
+        mod cloudabi;
+        pub use self::cloudabi::*;
+    } else if #[cfg(target_os = "hermit")] {
+        mod hermit;
+        pub use self::hermit::*;
+    } else if #[cfg(target_os = "wasi")] {
+        mod wasi;
+        pub use self::wasi::*;
+    } else if #[cfg(target_arch = "wasm32")] {
+        mod wasm;
+        pub use self::wasm::*;
+    } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] {
+        mod sgx;
+        pub use self::sgx::*;
+    } else {
+        mod unsupported;
+        pub use self::unsupported::*;
+    }
+}
+
+// Import essential modules from both platforms when documenting. These are
+// then later used in the `std::os` module when documenting, for example,
+// Windows when we're compiling for Linux.
+
+#[cfg(doc)]
+cfg_if::cfg_if! {
+    if #[cfg(unix)] {
+        // On unix we'll document what's already available
+        #[stable(feature = "rust1", since = "1.0.0")]
+        pub use self::ext as unix_ext;
+    } else if #[cfg(any(target_os = "cloudabi",
+                        target_os = "hermit",
+                        target_arch = "wasm32",
+                        all(target_vendor = "fortanix", target_env = "sgx")))] {
+        // On CloudABI and wasm right now the module below doesn't compile
+        // (missing things in `libc` which is empty) so just omit everything
+        // with an empty module
+        #[unstable(issue = "none", feature = "std_internals")]
+        #[allow(missing_docs)]
+        pub mod unix_ext {}
+    } else {
+        // On other platforms like Windows document the bare bones of unix
+        use crate::os::linux as platform;
+        #[path = "unix/ext/mod.rs"]
+        pub mod unix_ext;
+    }
+}
+
+#[cfg(doc)]
+cfg_if::cfg_if! {
+    if #[cfg(windows)] {
+        // On windows we'll just be documenting what's already available
+        #[allow(missing_docs)]
+        #[stable(feature = "rust1", since = "1.0.0")]
+        pub use self::ext as windows_ext;
+    } else if #[cfg(any(target_os = "cloudabi",
+                        target_arch = "wasm32",
+                        all(target_vendor = "fortanix", target_env = "sgx")))] {
+        // On CloudABI and wasm right now the shim below doesn't compile, so
+        // just omit it
+        #[unstable(issue = "none", feature = "std_internals")]
+        #[allow(missing_docs)]
+        pub mod windows_ext {}
+    } else {
+        // On all other platforms (aka linux/osx/etc) then pull in a "minimal"
+        // amount of windows goop which ends up compiling
+        #[macro_use]
+        #[path = "windows/compat.rs"]
+        mod compat;
+
+        #[path = "windows/c.rs"]
+        mod c;
+
+        #[path = "windows/ext/mod.rs"]
+        pub mod windows_ext;
+    }
+}