--- boost_1_66_0/boost/spirit/home/karma/numeric/detail/numeric_utils.hpp~	2018-02-23 16:59:53.785141676 +0000

+++ boost_1_66_0/boost/spirit/home/karma/numeric/detail/numeric_utils.hpp	2018-02-23 17:00:16.838092946 +0000

@@ -68,7 +68,11 @@

             typedef unsignedtype type;                                        \

             static type call(signedtype n)                                    \

             {                                                                 \

-                return static_cast<unsignedtype>((n >= 0) ? n : -n);          \

+                if (n >= 0)                                                   \

+                    return n;                                                 \

+                if (n == std::numeric_limits<signedtype>::min())              \

+                    return (unsignedtype)n;                                   \

+                return (unsignedtype)(-n);                                    \

             }                                                                 \

         }                                                                     \

     /**/