From 389f77ddd6a8eabe357691a9476f061f6262e563 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@allegro.clab.cs.cmu.edu>
Date: Thu, 25 Apr 2013 23:32:02 -0400
Subject: only turn on c++11 for extractor

---
 m4/ax_cxx_compile_stdcxx_11.m4 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'm4')

diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4
index 1bc31128..f6cf4a15 100644
--- a/m4/ax_cxx_compile_stdcxx_11.m4
+++ b/m4/ax_cxx_compile_stdcxx_11.m4
@@ -74,6 +74,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
     ac_success=yes
   fi
 
+  restore_it="$CXXFLAGS"
   m4_if([$1], [noext], [], [dnl
   if test x$ac_success = xno; then
     for switch in -std=gnu++11 -std=gnu++0x; do
@@ -87,7 +88,8 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
           [eval $cachevar=no])
          CXXFLAGS="$ac_save_CXXFLAGS"])
       if eval test x\$$cachevar = xyes; then
-        CXXFLAGS="$CXXFLAGS $switch"
+        CXXFLAGS="$CXXFLAGS"
+        c11switch="$switch"
         ac_success=yes
         break
       fi
@@ -107,12 +109,15 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
           [eval $cachevar=no])
          CXXFLAGS="$ac_save_CXXFLAGS"])
       if eval test x\$$cachevar = xyes; then
-        CXXFLAGS="$CXXFLAGS $switch"
+        CXXFLAGS="$CXXFLAGS"
+        c11switch="$switch"
         ac_success=yes
         break
       fi
     done
   fi])
+  CXXFLAGS="$restore_it"
+  AC_SUBST([CXX11_SWITCH], ["$c11switch"])
   AC_LANG_POP([C++])
   if test x$ax_cxx_compile_cxx11_required = xtrue; then
     if test x$ac_success = xno; then
-- 
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