rustc_llvm: add Windows system libs only when cross-compiling from Windows

This obviously doesn't work when cross-compiling from Linux.

Split out from: https://github.com/rust-lang/rust/pull/140772

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_llvm/build.rs b/compiler/rustc_llvm/build.rs
index a662694ac38..9a6549379d3 100644
--- a/compiler/rustc_llvm/build.rs
+++ b/compiler/rustc_llvm/build.rs
@@ -228,10 +228,10 @@ fn main() {
     let mut cmd = Command::new(&llvm_config);
     cmd.arg(llvm_link_arg).arg("--libs");
 
-    // Don't link system libs if cross-compiling unless targeting Windows.
+    // Don't link system libs if cross-compiling unless targeting Windows from Windows host.
     // On Windows system DLLs aren't linked directly, instead import libraries are used.
     // These import libraries are independent of the host.
-    if !is_crossed || target.contains("windows") {
+    if !is_crossed || target.contains("windows") && host.contains("windows") {
         cmd.arg("--system-libs");
     }