From c94e2a121d00b5709a61a4ffb37542f3d0eaf3f9 Mon Sep 17 00:00:00 2001
From: Hugh Bellamy <hughbellars@gmail.com>
Date: Fri, 25 Nov 2016 12:31:23 +0000
Subject: [PATCH] Don't pass empty "/" SDK path to the swift compiler when
 compiling the stdlib

---
 cmake/modules/AddSwift.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmake/modules/AddSwift.cmake b/cmake/modules/AddSwift.cmake
index 30014c3269a56..4c45ad0eab308 100644
--- a/cmake/modules/AddSwift.cmake
+++ b/cmake/modules/AddSwift.cmake
@@ -260,8 +260,12 @@ function(_add_variant_swift_compile_flags
     sdk arch build_type enable_assertions result_var_name)
   set(result ${${result_var_name}})
 
+  # On Windows, we don't set SWIFT_SDK_WINDOWS_PATH, so don't include it.
+  if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
+    list(APPEND result "-sdk" "${SWIFT_SDK_${sdk}_PATH}")
+  endif()
+
   list(APPEND result
-      "-sdk" "${SWIFT_SDK_${sdk}_PATH}"
       "-target" "${SWIFT_SDK_${sdk}_ARCH_${arch}_TRIPLE}"
       "-resource-dir" "${SWIFTLIB_DIR}")