From b03c2df9c37c6bc72af1bdbe7646e638b166d4a0 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Fri, 10 Jul 2015 13:15:00 +0100
Subject: [PATCH] Disable __alignof usage by clang when it emulating GCC and
 GCC's behavior is buggy.

---
 include/boost/type_traits/intrinsics.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/type_traits/intrinsics.hpp b/include/boost/type_traits/intrinsics.hpp
index eae359d..14a3ee8 100644
--- a/include/boost/type_traits/intrinsics.hpp
+++ b/include/boost/type_traits/intrinsics.hpp
@@ -218,7 +218,12 @@
 #   if __has_feature(has_trivial_move_assign)
 #     define BOOST_HAS_TRIVIAL_MOVE_ASSIGN(T) (__has_trivial_move_assign(T) && is_assignable<T&, T&&>::value && !::boost::is_volatile<T>::value)
 #   endif
-#   define BOOST_ALIGNMENT_OF(T) __alignof(T)
+#   if (!defined(unix) && !defined(__unix__)) || defined(__LP64__) || !defined(__GNUC__)
+// GCC sometimes lies about alignment requirements
+// of type double on 32-bit unix platforms, use the
+// old implementation instead in that case:
+#     define BOOST_ALIGNMENT_OF(T) __alignof(T)
+#   endif
 #   if __has_feature(is_final)
 #     define BOOST_IS_FINAL(T) __is_final(T)
 #   endif