From decb484facdbabd3a13793b3b4cbabcfd9cb1569 Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Mon, 23 Apr 2018 11:20:48 -0700
Subject: [PATCH] build: repair Windows build

`-ivfsoverlay` is no longer passed through to the driver with
`clang-cl`.  Explicitly mark it as a clang option to ensure that the
option is handled properly.  This repairs the build on Windows.
---
 cmake/modules/SwiftWindowsSupport.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/modules/SwiftWindowsSupport.cmake b/cmake/modules/SwiftWindowsSupport.cmake
index f25f57d8859..6bd0fb5042b 100644
--- a/cmake/modules/SwiftWindowsSupport.cmake
+++ b/cmake/modules/SwiftWindowsSupport.cmake
@@ -71,7 +71,7 @@ function(swift_windows_generate_sdk_vfs_overlay flags)
                  @ONLY)
 
   set(${flags}
-      -ivfsoverlay;"${CMAKE_BINARY_DIR}/windows-sdk-vfs-overlay.yaml"
+      -Xclang;-ivfsoverlay;-Xclang;"${CMAKE_BINARY_DIR}/windows-sdk-vfs-overlay.yaml"
       PARENT_SCOPE)
 endfunction()