Add yvals_core.h interposing library

clang/lib/Headers/CMakeLists.txt

@@ -256,6 +256,7 @@ set(windows_only_files
   intrin0.h
   intrin.h
   vadefs.h
+  yvals_core.h
 )
 
 set(utility_files

clang/lib/Headers/yvals_core.h

@@ -0,0 +1,26 @@
+/* ===-------- vadefs.h ---------------------------------------------------===
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+ *===-----------------------------------------------------------------------===
+ */
+
+/* Only include this if we are aiming for MSVC compatibility. */
+#ifndef _MSC_VER
+#include_next <yvals_core.h>
+#else
+
+#ifndef __clang_yvals_core_h
+#define __clang_yvals_core_h
+
+#include_next <yvals_core.h>
+
+#ifdef _STL_INTRIN_HEADER
+#undef _STL_INTRIN_HEADER
+#define _STL_INTRIN_HEADER <intrin0.h>
+#endif
+
+#endif
+#endif