update for R-devel changes to R_NO_REMAP

git-svn-id: https://svn.r-project.org/R/trunk@87325 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

doc/manual/R-exts.texi

@@ -10670,6 +10670,9 @@ LTO = -flto
 @node System and foreign language interfaces
 @chapter System and foreign language interfaces
 
+Many of the functions sescribed here have entry-point names with a
+@code{Rf_} prefix: if they are called from C++ code that prefix needs to
+added in the C++ code.
 
 @node  Operating system access
 @section  Operating system access
@@ -14792,6 +14795,9 @@ headers directly or @emph{via} inclusion from further packages, and may
 define @code{R_NO_REMAP} with or without including @file{Rinternals.h}.)
 @apihdr R_ext/Error.h
 
+As from @R{} 4.5.0, @code{R_NO_REMAP} is always defined when the @R{}
+headers are included from C++ code.
+
 Some of these entry points are declared in header @file{Rmath.h}, most
 of which are remapped there.  That remapping can be eliminated by
 defining @code{R_NO_REMAP_RMATH} (before including any @R{} headers) and