https://svn.boost.org/trac10/ticket/7320 <p> There are some warnings "duplicate friend declaration" with Intel C++ Compiler XE 12.1.5.344 at Windows (Windows 7 SP1 Pro) during building of programs using Boost.Exception: </p> <pre class="wiki">1&gt;..\..\..\..\boost_1_51_0\boost/exception/exception.hpp(258): warning #367: duplicate friend declaration 1&gt; friend struct exception_detail::get_info&lt;throw_function&gt;; 1&gt; ^ 1&gt; 1&gt;..\..\..\..\boost_1_51_0\boost/exception/exception.hpp(259): warning #367: duplicate friend declaration 1&gt; friend struct exception_detail::get_info&lt;throw_file&gt;; 1&gt; ^ 1&gt; 1&gt;..\..\..\..\boost_1_51_0\boost/exception/exception.hpp(260): warning #367: duplicate friend declaration 1&gt; friend struct exception_detail::get_info&lt;throw_line&gt;; 1&gt; ^ </pre><p> The warning level is Level4 (/W4). </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/7320 Trac 1.4.3