From 802399f3fab0820707dc8e562f206594e9a9e1db Mon Sep 17 00:00:00 2001
From: pashokitsme <pashamail79@gmail.com>
Date: Mon, 18 Dec 2023 16:14:48 +0300
Subject: [PATCH] Add `--` for files in `try_expand`  (like in #514) (#911)

* fix

* format
---
 src/lib.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 24329e9dc..699facfea 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1542,6 +1542,21 @@ impl Build {
             "Expand may only be called for a single file"
         );
 
+        let is_asm = self
+            .files
+            .iter()
+            .map(std::ops::Deref::deref)
+            .find_map(AsmFileExt::from_path)
+            .is_some();
+
+        if compiler.family == (ToolFamily::Msvc { clang_cl: true }) && !is_asm {
+            // #513: For `clang-cl`, separate flags/options from the input file.
+            // When cross-compiling macOS -> Windows, this avoids interpreting
+            // common `/Users/...` paths as the `/U` flag and triggering
+            // `-Wslash-u-filename` warning.
+            cmd.arg("--");
+        }
+
         cmd.args(self.files.iter().map(std::ops::Deref::deref));
 
         let name = compiler