From 03d9c110267183a78f2dfbb0bd74b6353fc7fdaf Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Wed, 12 Nov 2008 18:13:36 +0000
Subject: [PATCH] Fix 32-bit Linux alignment_of failure.

[SVN r49704]
---
 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 3458b9f..1e7d250 100644
--- a/include/boost/type_traits/intrinsics.hpp
+++ b/include/boost/type_traits/intrinsics.hpp
@@ -148,7 +148,12 @@
 #   define BOOST_IS_CLASS(T) __is_class(T)
 #   define BOOST_IS_ENUM(T) __is_enum(T)
 #   define BOOST_IS_POLYMORPHIC(T) __is_polymorphic(T)
-#   define BOOST_ALIGNMENT_OF(T) __alignof__(T)
+#   if !defined(unix) || defined(__LP64__)
+      // 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
 
 #   define BOOST_HAS_TYPE_TRAITS_INTRINSICS
 #endif