https://svn.boost.org/trac10/ticket/9691 <p> In CGAL (www.cgal.org), usage of BOOST_PARAMETER_FUNCTION triggers several of such following warnings with recent g++ (4.8) and LLVM/clang: </p> <pre class="wiki">CGAL-4.4-Ic-126/include/CGAL/perturb_mesh_3.h:39:1: warning: unused parameter 'args' [-Wunused-parameter] BOOST_PARAMETER_FUNCTION( ^ /usr/local/include/boost/parameter/preprocessor.hpp:937:5: note: expanded from macro 'BOOST_PARAMETER_FUNCTION' BOOST_PARAMETER_FUNCTION_AUX( \ ^ /usr/local/include/boost/parameter/preprocessor.hpp:933:5: note: expanded from macro 'BOOST_PARAMETER_FUNCTION_AUX' BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER(name, args, 0, 0, tag_namespace) ^ /usr/local/include/boost/parameter/preprocessor.hpp:911:5: note: expanded from macro 'BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER' BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER_AUX( \ ^ /usr/local/include/boost/parameter/preprocessor.hpp:899:21: note: expanded from macro 'BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER_AUX' , Args const&amp; args \ ^ </pre><p> I have verified that indeed the parameter is not used, and I propose that <strong>patch</strong>: </p> <pre class="wiki">diff --git a/include/boost/parameter/preprocessor.hpp b/include/boost/parameter/preprocessor.hpp index f1bda87..23ddbc4 100644 --- a/include/boost/parameter/preprocessor.hpp +++ b/include/boost/parameter/preprocessor.hpp @@ -896,7 +896,7 @@ struct funptr_predicate&lt;void**&gt; BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(name) \ ResultType BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name)( \ ResultType(*)() \ - , Args const&amp; args \ + , Args const&amp; \ , int \ BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \ BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG \ </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/9691 Trac 1.4.3