From 1db81713f6475bebd0ae689ac7139c53d2843c48 Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Mon, 1 Aug 2022 10:02:10 +0200
Subject: [PATCH] Link libatomic on 32-bit targets

This is needed since https://reviews.llvm.org/D128070.
---
 compiler/rustc_llvm/build.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/compiler/rustc_llvm/build.rs b/compiler/rustc_llvm/build.rs
index 62ef5804dce6..abb68f3afe52 100644
--- a/compiler/rustc_llvm/build.rs
+++ b/compiler/rustc_llvm/build.rs
@@ -242,6 +242,13 @@ fn main() {
         println!("cargo:rustc-link-lib=uuid");
     } else if target.contains("netbsd") || target.contains("haiku") || target.contains("darwin") {
         println!("cargo:rustc-link-lib=z");
+    } else if target.starts_with("arm")
+        || target.starts_with("mips-")
+        || target.starts_with("mipsel-")
+        || target.starts_with("powerpc-")
+    {
+        // 32-bit targets need to link libatomic.
+        println!("cargo:rustc-link-lib=atomic");
     }
     cmd.args(&components);