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A general description is here.
Package ‘tools’ has a new function ‘package_native_routine_registration_skeleton()’ to assist adding native-symbol registration to a package. See its help and §5.4.1 of ‘Writing R Extensions’ for how to use it. (When added it successfully automated adding registration to over 90% of CRAN packages which lacked it. Many of the failures were newly-detected bugs in the packages, e.g. 50 packages called entry points with varying numbers of arguments and 65 packages called entry points not in the package.)
If available, the POSIX 2008 system call ‘utimensat’ will be used by ‘Sys.setFileTime()’ and ‘file.copy(copy.date = TRUE)’. This may result in slightly more accurate file times.