From b604f9dea81b91f888fc723c6601e62b0c5b2350 Mon Sep 17 00:00:00 2001
From: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Date: Thu, 9 Mar 2017 18:31:12 +0100
Subject: [PATCH] compiler.h: Mock up a __builtin_types_compatible_p for C++

As g++/clang++ does not have one.
---
 include/linux/compiler.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 0a047fd..16410cf 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -78,6 +78,18 @@ extern void __chk_io_ptr(const volatile void __iomem *);
 #include <linux/compiler-clang.h>
 #endif
 
+#ifdef __cplusplus
+/* C++ does not have  __builtin_types_compatible_p, mock one up */
+template <typename type1, typename type2> struct _types_compatible_p {
+	static const int result = 0;
+};
+
+template <typename type1> struct _types_compatible_p<type1, type1> {
+	static const int result = 1;
+};
+
+#define __builtin_types_compatible_p( type1, type2 ) _types_compatible_p< type1, type2 >::result
+#endif
 /*
  * Generic compiler-dependent macros required for kernel
  * build go below this comment. Actual compiler/compiler version
-- 
2.10.2