id summary reporter owner description type status milestone component version severity resolution keywords cc 11904 is_nothrow_move_constructible does not compile on GCC 4.6 akrzemi1@… John Maddock "Tests is_nothrow_move_constructible_test and is_nothrow_move_constructible_test_no_intrinsics fail in branch Develop on tester igaztanaga-gcc-4.6c++11 (and also igaztanaga-gcc-4.7c++11). By ""fail"" I mean that the trait returns neither true nor false, but simply fails the compilation. This in turn causes failures in Boost.Optional." Bugs closed To Be Determined type_traits Boost 1.61.0 Problem fixed