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A general description is here.
‘parallel::detectCores()’ is now able to find the number of physical cores (rather than CPUs) on Sparc Solaris.
It can also do so on recent versions of Windows (but not Windows XP); however the default remains ‘detectCores(logical = TRUE)’ on that platform.
On 64-bit Linux systems, ‘configure’ now only sets ‘LIBnn’ to ‘lib64’ if ‘/usr/lib64’ exists. This may obviate setting ‘LIBnn’ explicitly on Debian-derived systems.
It is still necessary to set ‘LIBnn = lib’ for 32-bit builds of R on a 64-bit OS on those Linux distributions capable for supporting that concept.
‘stack()’ now gives an error if no vector column is selected, rather than returning a 1-column data frame (contrary to its documentation).
‘summary.mlm()’ did not handle objects where the formula had been specified by an expression. (Reported by Helios de Rosario Martinez).