From c150ad4941e5e7d87bcd3b487ea2debff0657aa1 Mon Sep 17 00:00:00 2001
From: Gilad Naaman <gilad@levltech.com>
Date: Mon, 16 Mar 2020 19:07:13 +0200
Subject: [PATCH] Switch to autocfg from rustc_version

---
 Cargo.toml |  2 +-
 build.rs   | 14 ++++----------
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index a7cf2e2..0cc174e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ keywords = ["mem", "offset", "offset_of", "offsetof"]
 categories = ["no-std"]
 
 [build-dependencies]
-rustc_version = "0.2.3"
+autocfg = "1"
 
 [dev-dependencies]
 doc-comment = "0.3"
diff --git a/build.rs b/build.rs
index 757de7d..8bc3c9f 100644
--- a/build.rs
+++ b/build.rs
@@ -1,20 +1,14 @@
-extern crate rustc_version;
-use rustc_version::{version, Version};
-
 fn main() {
-    let version = version().unwrap();
-
-    // Assert we haven't travelled back in time
-    assert!(version.major >= 1);
+    let ac = autocfg::new();
 
     // Check for a minimum version for a few features
-    if version >= Version::from((1, 31, 0)) {
+    if ac.probe_rustc_version(1, 31) {
         println!("cargo:rustc-cfg=allow_clippy");
     }
-    if version >= Version::from((1, 36, 0)) {
+    if ac.probe_rustc_version(1, 36) {
         println!("cargo:rustc-cfg=maybe_uninit");
     }
-    if version >= Version::from((1, 40, 0)) {
+    if ac.probe_rustc_version(1, 40) {
         println!("cargo:rustc-cfg=doctests");
     }
 }