[PATCH v2 2/2] include: Let _InterlockedCompareExchange128 be intrinsic for clang++.

[Eric Pouech]

From: Eric Pouech

clang++ generates an error when an intrinsic function is redefined as
an inline function.
Note the _InterlockedCompareExchange128 for a x86_64 machine is only
defined as intrinsic when -mcx16 option is enabled.
But we use always use the intrinsic definition on x86_64 so that
compilation done without the -mcx16 could be detected (on C++ only).
And the intrinsic has been added recently to aarch64 machine for clang.
So, it's detected thanks to __has_builtin() macro.

(thanks to Jacek for some insights on clang)

Signed-off-by: Eric Pouech 
---
 include/winnt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/winnt.h b/include/winnt.h
index 6b47d0e41c0..e9fef20c76d 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -7184,7 +7184,7 @@ static FORCEINLINE DECLSPEC_NORETURN void __fastfail(unsigned int code)

#define InterlockedCompareExchange128 _InterlockedCompareExchange128

-#if defined(_MSC_VER) && !defined(__clang__)
+#if defined(_MSC_VER) && (!defined(__clang__) || !defined(__aarch64__) || __has_builtin(_InterlockedCompareExchange128))

#pragma intrinsic(_InterlockedCompareExchange128)
 unsigned char _InterlockedCompareExchange128(volatile __int64 *, __int64, __int64, __int64 *);