title: Boost Multiprecision symbols not found during linking with Accumulator
body: <p>Hi I'm using Boost Multiprecision libraries with the Boost accumulator. When I'm linking with CMakeLists it's giving me a reference issue</p>
  <pre><code>Undefined symbols for architecture x86_64:
    &quot;___gmpf_add&quot;, referenced from:
        void boost::multiprecision::backends::eval_add&lt;50u, 50u&gt;(boost::multiprecision::backends::gmp_float&lt;50u&gt;&amp;, boost::multiprecision::backends::gmp_float&lt;50u&gt; const&amp;) in historicQuotePropogationController.cpp.o
    &quot;___gmpf_clear&quot;, referenced from:
        boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt;::~gmp_float_imp() in historicQuotePropogationController.cpp.o
    &quot;___gmpf_get_prec&quot;, referenced from:
        boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt;::gmp_float_imp(boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt; const&amp;) in historicQuotePropogationController.cpp.o
    &quot;___gmpf_init2&quot;, referenced from:
        boost::multiprecision::backends::gmp_float&lt;50u&gt;::gmp_float() in historicQuotePropogationController.cpp.o
        boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt;::gmp_float_imp(boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt; const&amp;) in historicQuotePropogationController.cpp.o
    &quot;___gmpf_mul&quot;, referenced from:
        void boost::multiprecision::backends::eval_multiply&lt;50u, 50u, 50u&gt;(boost::multiprecision::backends::gmp_float&lt;50u&gt;&amp;, boost::multiprecision::backends::gmp_float&lt;50u&gt; const&amp;, boost::multiprecision::backends::gmp_float&lt;50u&gt; const&amp;) in historicQuotePropogationController.cpp.o
    &quot;___gmpf_set&quot;, referenced from:
        boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt;::gmp_float_imp(boost::multiprecision::backends::detail::gmp_float_imp&lt;50u&gt; const&amp;) in historicQuotePropogationController.cpp.o
  ld: symbol(s) not found for architecture x86_64
  </code></pre>
  <p>This is the class I'm using it in</p>
  <pre><code>    class StatsControllerManager {
      public:
          bool propogateNewStats(Model::Stat stats);
          vector&lt;Model::Stat&gt; propogateNewStats(vector&lt;Model::Stat&gt; stats);
      private:
          void initialize(std::string name, bool backpopulate = false);
          std::unordered_map&lt;std::string, Controller&gt; historicStats;
      };
  </code></pre>
  <p>Could anyone help point me in the right direction?</p>