implement _R_USE_NO_REMAP_

git-svn-id: https://svn.r-project.org/R/trunk@87328 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

doc/NEWS.Rd

@@ -158,6 +158,11 @@
     \itemize{
       \item Control of symbol visibility is now supported on macOS (the
       previous check only worked on ELF platforms).
+
+      \item Setting environment variable \env{_R_USE_NO_REMAP_} to a
+      true valueforces \code{R_NO_REMAP} to be defined during
+      compilation of C code, except for packages with a
+      \file{src/Makefile}.
     }
   }
 

src/library/tools/R/install.R

@@ -2762,6 +2762,8 @@ if(FALSE) {
                         paste0("LTO_FC=", shQuote("$(LTO_FC_OPT)")))
                   else if(isFALSE(use_lto)) c("LTO=", "LTO_FC=")
                   )
+    if(config_val_to_logical(Sys.getenv("_R_USE_NO_REMAP_", "TRUE")))
+         makeargs <- c(makeargs, "XDEFS=-DR_NO_REMAP")
     if(config_val_to_logical(Sys.getenv("_R_CXX_USE_NO_REMAP_", "TRUE")))
          makeargs <- c(makeargs, "CXX_DEFS=-DR_NO_REMAP")
 ##    if(config_val_to_logical(Sys.getenv("_R_USE_STRICT_R_HEADERS_", "FALSE")))