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A general description is here.
The remapping of ‘rround()’ in header ‘Rmath.h’ has been removed: use ‘fround()’ instead.
Remapping in the ‘Rmath.h’ header can be suppressed by defining ‘R_NO_REMAP_RMATH’. (Problems with the remapped names have been seen in C++11 headers. The remapping of ‘prec’ and ‘trunc’ can be suppressed by defining only ‘R_NO_REMAP_RMATH2’: this is done for C++ code.)
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.