id summary reporter owner description type status milestone component version severity resolution keywords cc 10591 boost::filesystem does not build on iOS 8 anonymous Beman Dawes boost::filesystem::detail::operations relies on AT_SYMLINK_NOFOLLOW macro to decide whenever to use fchmodat function or not. Since iOS8 AT_SYMLINK_NOFOLLOW is defined on iOS but fchmodat still not available which breaks this logic and lead to compilation error. Bugs reopened To Be Determined filesystem Boost 1.63.0 Problem