From da1081a8f43c3f7ea617a38e509b7d6c301d9d36 Mon Sep 17 00:00:00 2001
From: Taiki Endo <te316e89@gmail.com>
Date: Sun, 22 Nov 2020 11:55:16 +0900
Subject: [PATCH] Do not fail to compile if autocfg unable to determine rustc
 version

---
 crossbeam-utils/build.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/crossbeam-utils/build.rs b/crossbeam-utils/build.rs
index 86c40ab9b..df52eddc7 100644
--- a/crossbeam-utils/build.rs
+++ b/crossbeam-utils/build.rs
@@ -1,5 +1,17 @@
+use autocfg::AutoCfg;
+
 fn main() {
-    let cfg = autocfg::new();
+    let cfg = match AutoCfg::new() {
+        Ok(cfg) => cfg,
+        Err(e) => {
+            println!(
+                "cargo:warning=crossbeam-utils: unable to determine rustc version: {}",
+                e
+            );
+            return;
+        }
+    };
+
     cfg.emit_type_cfg("core::sync::atomic::AtomicU8", "has_atomic_u8");
     cfg.emit_type_cfg("core::sync::atomic::AtomicU16", "has_atomic_u16");
     cfg.emit_type_cfg("core::sync::atomic::AtomicU32", "has_atomic_u32");