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A general description is here.
‘USE_FC_LEN_T’ will become the default: this uses the correct prototypes for Fortran BLAS/LAPACK routines called from C/C++, and requires adjustment of most such calls - see “Writing R Extensions”.
Header ‘R_ext/Constants.h’ (included by ‘R.h’) when included from C++ now includes the C++ header ‘cfloat’ rather than the C header ‘float.h’ (as C++11 is now required).
The legacy S-compatibility macros ‘SINGLE_*’ in ‘R_ext/Constants.h’ (included by ‘R.h’) are deprecated and will be removed in due course.
‘asOneSidedFormula()’ now associates the resulting formula with the global environment rather than the evaluation environment created for the call.