From 391b472a370a5d35c43bd0a26182076cf0c17ca9 Mon Sep 17 00:00:00 2001
From: Havard Eidnes <he@NetBSD.org>
Date: Thu, 26 Oct 2023 17:10:16 +0000
Subject: [PATCH] rustc_llvm/build.rs: improve comment for NetBSD/i386 targets

...explaining why we need -latomic (gcc & g++ built for i486,
and LLVM insisting on use of 64-bit atomics).
---
 compiler/rustc_llvm/build.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_llvm/build.rs b/compiler/rustc_llvm/build.rs
index acb1d9607a4..e4412132136 100644
--- a/compiler/rustc_llvm/build.rs
+++ b/compiler/rustc_llvm/build.rs
@@ -258,7 +258,9 @@ fn main() {
     {
         println!("cargo:rustc-link-lib=z");
     } else if target.contains("netbsd") {
-        // Building for i586 or i686, we need -latomic for 64-bit atomics
+        // On NetBSD/i386, gcc and g++ is built for i486 (to maximize backward compat)
+        // However, LLVM insists on using 64-bit atomics.
+        // This gives rise to a need to link rust itself with -latomic for these targets
         if target.starts_with("i586")
            || target.starts_with("i686")
         {