From cfafcd5906e6020ae67014e33a84446824301c95 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 14 May 2024 13:18:11 -0700
Subject: [PATCH] Support OUT_DIR located in \\?\ path on Windows

---
 build/build.rs | 6 ++++++
 src/lib.rs     | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/build/build.rs b/build/build.rs
index 05f88dc..c1355f2 100644
--- a/build/build.rs
+++ b/build/build.rs
@@ -75,10 +75,16 @@ fn main() {
 
     if version.minor >= 80 {
         println!("cargo:rustc-check-cfg=cfg(cfg_macro_not_allowed)");
+        println!("cargo:rustc-check-cfg=cfg(host_os, values(\"windows\"))");
     }
 
     let version = format!("{:#?}\n", version);
     let out_dir = env::var_os("OUT_DIR").expect("OUT_DIR not set");
     let out_file = Path::new(&out_dir).join("version.expr");
     fs::write(out_file, version).expect("failed to write version.expr");
+
+    let host = env::var_os("HOST").expect("HOST not set");
+    if let Some("windows") = host.to_str().unwrap().split('-').nth(2) {
+        println!("cargo:rustc-cfg=host_os=\"windows\"");
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 4802003..47a0370 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -183,8 +183,12 @@ use crate::error::Error;
 use crate::version::Version;
 use proc_macro::TokenStream;
 
+#[cfg(not(host_os = "windows"))]
 const RUSTVERSION: Version = include!(concat!(env!("OUT_DIR"), "/version.expr"));
 
+#[cfg(host_os = "windows")]
+const RUSTVERSION: Version = include!(concat!(env!("OUT_DIR"), "\\version.expr"));
+
 #[proc_macro_attribute]
 pub fn stable(args: TokenStream, input: TokenStream) -> TokenStream {
     expand::cfg("stable", args, input)