From 75aab6e625de8222e8b17f9e435e265ca7af257b Mon Sep 17 00:00:00 2001
From: Shoaib Meenai <smeenai@fb.com>
Date: Wed, 13 Dec 2017 21:12:37 +0000
Subject: [PATCH] [cmake] Explicitly set VS 2017 compatibility

When cross-compiling using clang-cl 5.0 (which is currently the latest
stable release of the compiler), the default MS compatibility level is
set to VS 2013, which is too low to build LLVM. Explicitly set the
compatibility level to VS 2017 to support cross-compiling LLVM for
Windows using clang-cl 5.0. This will be a no-op when using clang-cl 6.0
and above, where the default MS compatibility level is already VS 2017.

Differential Revision: https://reviews.llvm.org/D41157

llvm-svn: 320616
---
 llvm/cmake/platforms/WinMsvc.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/cmake/platforms/WinMsvc.cmake b/llvm/cmake/platforms/WinMsvc.cmake
index 9ea9ff78a255..34e6bbb9f9b2 100644
--- a/llvm/cmake/platforms/WinMsvc.cmake
+++ b/llvm/cmake/platforms/WinMsvc.cmake
@@ -164,6 +164,7 @@ set(CROSS_TOOLCHAIN_FLAGS_NATIVE "${_CTF_NATIVE_DEFAULT}" CACHE STRING "")
 
 set(COMPILE_FLAGS
     -D_CRT_SECURE_NO_WARNINGS
+    -fms-compatibility-version=19.11
     -imsvc "${MSVC_INCLUDE}"
     -imsvc "${WINSDK_INCLUDE}/ucrt"
     -imsvc "${WINSDK_INCLUDE}/shared"