id summary reporter owner description type status milestone component version severity resolution keywords cc 13616 """likely"" is c++2a-keyword used by gcc 8.1.1 but used as identifier" anonymous az_sw_dude "In new [http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0479r5.html C++2a-Specification] new attribute-tokens, ""likely"" and ""unlikely"", are introduced. In GCC 8.1.1 this proposed feature has already been implemented. So using GCC8.1.1+ boost (version 1.67) won't compile anymore since ""likely"" is used as identifier in different header files. For example: boost/date_time/special_values_parser.hpp:105:17 boost/date_time/time_parsing.hpp:312:19 " Bugs new To Be Determined date_time Boost 1.67.0 Problem