From 5a4ccab86684a05075cf93ac0063d782bdc2ae42 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Mon, 5 Aug 2024 16:26:27 -0500
Subject: [PATCH] Fix emscripten as `os` rather than `env`.

b7af6078 ("Switch to a target structure...") is checking whether the
target environment is emscripten, but it seems emscripten is the OS. Fix
this, which should resolve the issue in
<https://github.com/rust-lang/rust/pull/128691#issuecomment-2269933428>.
---
 library/compiler-builtins/build.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/compiler-builtins/build.rs b/library/compiler-builtins/build.rs
index 749a08a5ae20..bbae9e2862f1 100644
--- a/library/compiler-builtins/build.rs
+++ b/library/compiler-builtins/build.rs
@@ -55,7 +55,7 @@ fn main() {
     println!("cargo:rustc-cfg=feature=\"unstable\"");
 
     // Emscripten's runtime includes all the builtins
-    if target.env == "emscripten" {
+    if target.os == "emscripten" {
         return;
     }