From 0219333fa1144cf811ae2324b64eb266f002f343 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Thu, 30 May 2024 23:07:57 +0200
Subject: [PATCH] Disable strict aliasing for C++03 implementations as
 type-punning is used to make value_type movable.

---
 include/boost/container/flat_map.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/boost/container/flat_map.hpp b/include/boost/container/flat_map.hpp
index e4843f5..09a2c25 100644
--- a/include/boost/container/flat_map.hpp
+++ b/include/boost/container/flat_map.hpp
@@ -52,6 +52,12 @@
 #define BOOST_CONTAINER_STD_PAIR_IS_MOVABLE
 #endif
 
+//for C++03 compilers, were type-puning is the only option for std::pair
+//disable strict aliasing to reduce problems.
+#if defined(BOOST_GCC) && (BOOST_GCC >= 100000) && !defined(BOOST_CONTAINER_STD_PAIR_IS_MOVABLE)
+#pragma GCC push_options
+#pragma GCC optimize("no-strict-aliasing")
+#endif
 
 namespace boost {
 namespace container {
@@ -3014,6 +3020,10 @@ class flat_multimap
    {  x.swap(y);  }
 };
 
+#if defined(BOOST_GCC) && (BOOST_GCC >= 100000) && !defined(BOOST_CONTAINER_STD_PAIR_IS_MOVABLE)
+#pragma GCC pop_options
+#endif
+
 #ifndef BOOST_CONTAINER_NO_CXX17_CTAD
 
 template <typename InputIterator>