https://svn.boost.org/trac10/ticket/12302 <p> The command </p> <pre class="wiki">./b2 install </pre><p> gives the following warnings </p> <pre class="wiki">./boost/asio/error.hpp:258:45: warning: ‘boost::asio::error::system_category’ defined but not used [-Wunused-variable] static const boost::system::error_category&amp; system_category ^ ./boost/asio/error.hpp:260:45: warning: ‘boost::asio::error::netdb_category’ defined but not used [-Wunused-variable] static const boost::system::error_category&amp; netdb_category ^ ./boost/asio/error.hpp:262:45: warning: ‘boost::asio::error::addrinfo_category’ defined but not used [-Wunused-variable] static const boost::system::error_category&amp; addrinfo_category ^ ./boost/asio/error.hpp:264:45: warning: ‘boost::asio::error::misc_category’ defined but not used [-Wunused-variable] static const boost::system::error_category&amp; misc_category </pre><p> Any ideas why? </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/12302 Trac 1.4.3 viboes Fri, 19 Aug 2016 21:20:29 GMT https://svn.boost.org/trac10/ticket/12302#comment:1 https://svn.boost.org/trac10/ticket/12302#comment:1 <ul> <li><strong>owner</strong> set to <span class="trac-author">chris_kohlhoff</span> </li> <li><strong>component</strong> <span class="trac-field-old">None</span> → <span class="trac-field-new">asio</span> </li> </ul> Ticket