From 17612676b83ef42cdffcda9192253e25b5f79397 Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Wed, 11 Jan 2012 23:00:55 +0000
Subject: [PATCH] Detail: Disable container forward declarations for recent
 versions of libstdc++, refs #6326.

[SVN r76419]
---
 include/boost/detail/container_fwd.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/boost/detail/container_fwd.hpp b/include/boost/detail/container_fwd.hpp
index 659e428..7df7ccb 100644
--- a/include/boost/detail/container_fwd.hpp
+++ b/include/boost/detail/container_fwd.hpp
@@ -38,7 +38,11 @@
 #    define BOOST_DETAIL_NO_CONTAINER_FWD
 #  elif defined(__GLIBCPP__) || defined(__GLIBCXX__)
      // GNU libstdc++ 3
-#    if defined(_GLIBCXX_DEBUG) \
+     //
+     // Disable forwarding for all recent versions, as the library has a
+     // versioned namespace mode, and I don't know how to detect it.
+#    if __GLIBCXX__ >= 20070513 \
+        || defined(_GLIBCXX_DEBUG) \
         || defined(_GLIBCXX_PARALLEL) \
         || defined(_GLIBCXX_PROFILE)
 #      define BOOST_DETAIL_NO_CONTAINER_FWD