From 9435ba4d7799ffd62dfadf9e2f1ecdc18121e7a8 Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Sun, 4 Oct 2020 16:10:08 -0400
Subject: [PATCH] Instruct lld that our @ files are posix-style, not Windows

An upstream LLVM change changed behavior here to respect the host system quoting
rules; previously the posix-style format was always used for @files.
---
 src/librustc_codegen_ssa/back/command.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/librustc_codegen_ssa/back/command.rs b/src/librustc_codegen_ssa/back/command.rs
index 0208bb73abdb..503c51d24b68 100644
--- a/src/librustc_codegen_ssa/back/command.rs
+++ b/src/librustc_codegen_ssa/back/command.rs
@@ -111,6 +111,12 @@ impl Command {
                     LldFlavor::Link => "link",
                     LldFlavor::Ld64 => "darwin",
                 });
+                if let LldFlavor::Wasm = flavor {
+                    // LLVM expects host-specific formatting for @file
+                    // arguments, but we always generate posix formatted files
+                    // at this time. Indicate as such.
+                    c.arg("--rsp-quoting=posix");
+                }
                 c
             }
         };