id summary reporter owner description type status milestone component version severity resolution keywords cc 6113 duplicate symbol when BOOST_CHRONO_HEADER_ONLY is defined viboes viboes " A lot of symbols that should be static to the implementation file when BOOST_CHRONO_HEADER_ONLY is not defined are now duplicated: ld: duplicate symbol boost::chrono::chrono_detail::init_steady_clock(int&) in ../../../bin.v2/libs/date/build/darwin-4.2.1/debug/days_date.o and ../../../bin.v2/libs/date/build/darwin-4.2.1/debug/rel_date.o The workaround is of course to let undefined BOOST_CHRONO_HEADER_ONLY" Bugs closed Boost 1.49.0 chrono Boost 1.47.0 Problem fixed