From b1a55ca3a48d22e66d204c5331d5b2956ee4d892 Mon Sep 17 00:00:00 2001
From: PM_Extra <pm@jubeat.net>
Date: Sun, 4 Dec 2016 13:42:52 +0800
Subject: [PATCH] Use the feature checking macros to detect thread_local
 support in clang.

---
 include/spdlog/details/os.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/spdlog/details/os.h b/include/spdlog/details/os.h
index 31d880b7..86c1e70d 100644
--- a/include/spdlog/details/os.h
+++ b/include/spdlog/details/os.h
@@ -48,6 +48,10 @@
 
 #endif
 
+#ifndef __has_feature       // Clang - feature checking macros.
+#define __has_feature(x) 0  // Compatibility with non-clang compilers.
+#endif
+
 namespace spdlog
 {
 namespace details
@@ -315,7 +319,7 @@ inline size_t _thread_id()
 //Return current thread id as size_t (from thread local storage)
 inline size_t thread_id()
 {
-#if defined(_MSC_VER) && (_MSC_VER < 1900) || defined(__clang_major__) && (__clang_major__ < 8)
+#if defined(_MSC_VER) && (_MSC_VER < 1900) || defined(__clang__) && !__has_feature(cxx_thread_local)
     return _thread_id();
 #else
     static thread_local const size_t tid = _thread_id();