From 52ca7c6c565579bfc732184597a30fa904656493 Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Fri, 23 Mar 2018 18:45:42 -0700
Subject: [PATCH] make DYNAMIC_BMI2 support of clang conditional to
 __has_attribute()

to support older clang versions such as 3.4
---
 lib/common/compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index bb873012..a6044c86 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -74,7 +74,7 @@
  * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default.
  */
 #ifndef DYNAMIC_BMI2
-  #if defined(__clang__)    \
+  #if (defined(__clang__) && __has_attribute(__target__)) \
       || (defined(__GNUC__) \
           && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) \
       && (defined(__x86_64__) || defined(_M_X86)) \