From 61377c582e0f2675baa5f5e6e30a35d1a4164b33 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Mon, 1 May 2017 16:08:43 +0300
Subject: Add hxx extension for headers and lib prefix for library dir

---
 libbutl/ft/lang.hxx | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 libbutl/ft/lang.hxx

(limited to 'libbutl/ft/lang.hxx')

diff --git a/libbutl/ft/lang.hxx b/libbutl/ft/lang.hxx
new file mode 100644
index 0000000..5daf9c9
--- /dev/null
+++ b/libbutl/ft/lang.hxx
@@ -0,0 +1,29 @@
+// file      : libbutl/ft/lang.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUTL_FT_LANG_HXX
+#define LIBBUTL_FT_LANG_HXX
+
+// __cpp_thread_local (extension)
+//
+// If this macro is undefined then one may choose to fallback to __thread.
+// Note, however, that it only for values that do not require dynamic
+// (runtime) initialization.
+//
+#ifndef __cpp_thread_local
+   //
+   // Apparently Apple's Clang "temporarily disabled" C++11 thread_local until
+   // they can implement a "fast" version, which reportedly happened in XCode
+   // 8.
+   //
+#  if defined(__apple_build_version__)
+#    if __apple_build_version__ >= 8000000
+#      define __cpp_thread_local 201103
+#    endif
+#  else
+#    define __cpp_thread_local 201103
+#  endif
+#endif
+
+#endif // LIBBUTL_FT_LANG_HXX
-- 
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