id summary reporter owner description type status milestone component version severity resolution keywords cc 9101 __DragonFly__ preprocessor macro not defined for VC++ ianjirka@… pmenso57 "7>c:\users\ian\dev\tensor\main\code\external\boost\latest\boost\detail\endian.hpp(50): warning C4668: '__DragonFly__' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif' (main.cpp) The other ones are (__NetBSD__, __FreeBSD__, __ANDROID__, etc.), so I assume it is an oversight. And causes C4668 as you can see." Bugs closed To Be Determined preprocessor Boost 1.54.0 Problem fixed