--- a/b/boost/boost/spirit/home/classic/debug/impl/parser_names.ipp
+++ a/b/boost/boost/spirit/home/classic/debug/impl/parser_names.ipp
@@ -95,7 +95,7 @@
 //  from numerics.hpp
     template <typename T, int Radix, unsigned MinDigits, int MaxDigits>
     inline std::string
-    parser_name(uint_parser<T, Radix, MinDigits, MaxDigits> const& p)
+    parser_name(uint_parser<T, Radix, MinDigits, MaxDigits> const&)
     {
         BOOST_SPIRIT_SSTREAM stream;
         stream << Radix << ", " << MinDigits << ", " << MaxDigits;
@@ -106,7 +106,7 @@
 
     template <typename T, int Radix, unsigned MinDigits, int MaxDigits>
     inline std::string
-    parser_name(int_parser<T, Radix, MinDigits, MaxDigits> const& p)
+    parser_name(int_parser<T, Radix, MinDigits, MaxDigits> const&)
     {
         BOOST_SPIRIT_SSTREAM stream;
         stream << Radix << ", " << MinDigits << ", " << MaxDigits;
@@ -117,7 +117,7 @@
 
     template <typename T, typename RealPoliciesT>
     inline std::string
-    parser_name(real_parser<T, RealPoliciesT> const& p)
+    parser_name(real_parser<T, RealPoliciesT> const&)
     {
         return std::string("real_parser");
     }
@@ -218,7 +218,7 @@
 //  from parser.hpp
     template <typename DerivedT>
     inline std::string
-    parser_name(parser<DerivedT> const& p)
+    parser_name(parser<DerivedT> const&)
     {
         return std::string("parser");
     }
@@ -227,7 +227,7 @@
 //  from primitives.hpp
     template <typename DerivedT>
     inline std::string
-    parser_name(char_parser<DerivedT> const &p)
+    parser_name(char_parser<DerivedT> const &)
     {
         return std::string("char_parser");
     }