Warnings "duplicate friend declaration" with Intel C++ Compiler XE 12.1.5.344

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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:

1>..\..\..\..\boost_1_51_0\boost/exception/exception.hpp(258): warning #367: duplicate friend declaration
1>            friend struct exception_detail::get_info<throw_function>;
1>            ^
1>  
1>..\..\..\..\boost_1_51_0\boost/exception/exception.hpp(259): warning #367: duplicate friend declaration
1>            friend struct exception_detail::get_info<throw_file>;
1>            ^
1>  
1>..\..\..\..\boost_1_51_0\boost/exception/exception.hpp(260): warning #367: duplicate friend declaration
1>            friend struct exception_detail::get_info<throw_line>;
1>            ^

The warning level is Level4 (/W4).