https://svn.boost.org/trac10/ticket/516 <pre class="wiki">I've been tracking down an preprocessor warning involving the redefinition of BOOST_TT_AUX_BOOL_TRAIT_DEF1. It appears to me that variant/recursive_wrapper_fwd.hpp is misusing: #include "boost/type_traits/detail/bool_trait_def.hpp" The usual include pattern for this header is: // should be the last #include #include "boost/type_traits/detail/bool_trait_def.hpp" ... #include "boost/type_traits/detail/bool_trait_undef.hpp" But recursive_wrapper_fwd.hpp has: #include "boost/type_traits/detail/bool_trait_def.hpp" #include "boost/mpl/aux_/lambda_support.hpp" ... and no include for bool_trait_undef.hpp. This is causing a redefinition warning on Apple darwin for BOOST_TT_AUX_BOOL_TRAIT_DEF1. Changing recursive_wrapper_fwd.hpp to the usual use pattern of bool_trait_def.hpp as described above silences the warning. Thanks, Howard hinnant@twcny.rr.com </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/516 Trac 1.4.3 ebf Sat, 26 Nov 2005 05:45:24 GMT https://svn.boost.org/trac10/ticket/516#comment:2 https://svn.boost.org/trac10/ticket/516#comment:2 <ul> <li><strong>status</strong> <span class="trac-field-old">assigned</span> → <span class="trac-field-new">closed</span> </li> </ul> Ticket