From 59e05349ae7f88d1891e454914a7a2d7ac01023d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 22 Aug 2017 16:37:47 +0200
Subject: Work around issue with exporting internal linkage names in libstdc++

See Clang bug 33910 for details.
---
 std-core.mxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/std-core.mxx b/std-core.mxx
index 6ee4a9e..3aba712 100644
--- a/std-core.mxx
+++ b/std-core.mxx
@@ -2,6 +2,28 @@
 // copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
+// For some standard library implementations we need to pre-include certain
+// headers to prevent their exporting. And to detect a standard library we
+// need to include a certain header first.
+//
+#if defined(__clang__)
+#  if   __has_include(<__config>)         // libc++    _LIBCPP_VERSION
+#    include <__config>
+#  elif __has_include(<bits/c++config.h>) // libstdc++ __GLIBCXX__
+#    include <bits/c++config.h>
+#  endif
+#elif defined(__GNUC__)
+#  include <bits/c++config.h>             // libstdc++ __GLIBCXX__
+#endif
+
+#if   defined(_MSC_VER)
+#elif defined(__GLIBCXX__)
+#  include <ext/atomicity.h>   // Names with internal linkage.
+#elif defined(_LIBCPP_VERSION)
+#else
+#  error unknown standard library implementation
+#endif
+
 export module std.core;
 
 export
-- 
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