new C++2a plugin for g++ 8 or later

Author: eddelbuettel

ChangeLog

@@ -1,3 +1,8 @@
+2018-12-01  Dirk Eddelbuettel  <[email protected]>
+
+	* R/Attributes.R: Added new 'c++2a' plugin for '-std=c++2a'
+	compilation standard supported by g++ 8 or later
+
 2018-11-11  Dirk Eddelbuettel  <[email protected]>
 
 	* inst/include/Rcpp/vector/Subsetter.h (check_indices): More

R/Attributes.R

@@ -1,5 +1,5 @@
 
-# Copyright (C) 2012 - 2017  JJ Allaire, Dirk Eddelbuettel and Romain Francois
+# Copyright (C) 2012 - 2018  JJ Allaire, Dirk Eddelbuettel and Romain Francois
 #
 # This file is part of Rcpp.
 #
@@ -469,7 +469,7 @@ compileAttributes <- function(pkgdir = ".", verbose = getOption("verbose")) {
 # setup plugins environment
 .plugins <- new.env()
 
-# built-in C++98 plugin 
+# built-in C++98 plugin
 .plugins[["cpp98"]] <- function() {
     if (getRversion() >= "3.4")         # with recent R versions, R can decide
         list(env = list(USE_CXX98 = "yes"))
@@ -523,6 +523,12 @@ compileAttributes <- function(pkgdir = ".", verbose = getOption("verbose")) {
     list(env = list(PKG_CXXFLAGS ="-std=c++1z"))
 }
 
+## built-in C++2a plugin for g++ 8 and later
+## cf https://gcc.gnu.org/projects/cxx-status.html as of Dec 2018
+.plugins[["cpp2a"]] <- function() {
+    list(env = list(PKG_CXXFLAGS ="-std=c++2a"))
+}
+
 ## built-in OpenMP plugin
 .plugins[["openmp"]] <- function() {
     list(env = list(PKG_CXXFLAGS="-fopenmp",