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A general description is here.
There is _experimental_ support for compiling C++11 code in packages. The file ‘src/Makevars’ or ‘src/Makevars.win’ should define the macro ‘USE_CXX11 = true’. Where needed, an alternative C++11 compiler can be specified by setting macros ‘CXX11’, ‘CXX11FLAGS’ and so on, either when R is configured or in a personal ‘Makevars’ file. (The default is to use ‘$(CXX) -std=c++11’.)
The long undocumented remapping of ‘rround()’ to ‘Rf_fround()’ in
header ‘Rmath.h’ is now formally deprecated: use ‘fround()’ directly.
The remapping of ‘round()’ to ‘Rf_fround()’ in header ‘Rmath.h’ is
deprecated and may be removed in future.
The long undocumented remapping of ‘rround()’ to ‘Rf_fround()’ in header ‘Rmath.h’ is now formally deprecated: use ‘fround()’ directly.
Remapping of ‘prec()’ and ‘trunc()’ in the ‘Rmath.h’ header has been disabled in C++ code (it has caused breakage with ‘libc++’ headers).
As a result of the 3.0.2 change about ‘the last second before the epoch’, most conversions which should have given ‘NA’ returned that time. (The platforms affected include Linux and OS X, but not Windows nor Solaris.)