From b14994aeffe7b147371746f9891437cdbc5bdb33 Mon Sep 17 00:00:00 2001
From: Yixuan Qiu <yixuan.qiu@cos.name>
Date: Fri, 16 Dec 2016 18:11:06 -0500
Subject: [PATCH] [R Package] Use the C++ 11 compiler to test OpenMP flags
 (#1881)

* fix segfault when gctorture() is enabled

* use the C++ 11 compiler to test OpenMP flags

* auto-generated configure script
---
 R-package/configure    | 5 +++++
 R-package/configure.ac | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/R-package/configure b/R-package/configure
index 4bde6d029..d93a8c446 100755
--- a/R-package/configure
+++ b/R-package/configure
@@ -1779,6 +1779,11 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
+CXX1X=`"${R_HOME}/bin/R" CMD config CXX1X`
+CXX1XSTD=`"${R_HOME}/bin/R" CMD config CXX1XSTD`
+CXX="${CXX1X} ${CXX1XSTD}"
+CXXFLAGS=`"${R_HOME}/bin/R" CMD config CXX1XFLAGS`
+
 ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
 ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
diff --git a/R-package/configure.ac b/R-package/configure.ac
index 27b9f20d8..edb504706 100644
--- a/R-package/configure.ac
+++ b/R-package/configure.ac
@@ -4,6 +4,11 @@ AC_PREREQ(2.62)
 
 AC_INIT([xgboost],[0.6-0],[],[xgboost],[])
 
+CXX1X=`"${R_HOME}/bin/R" CMD config CXX1X`
+CXX1XSTD=`"${R_HOME}/bin/R" CMD config CXX1XSTD`
+CXX="${CXX1X} ${CXX1XSTD}"
+CXXFLAGS=`"${R_HOME}/bin/R" CMD config CXX1XFLAGS`
+
 AC_LANG(C++)
   OPENMP_[]_AC_LANG_PREFIX[]FLAGS=
   AC_ARG_ENABLE([openmp],