From 9114b267a8abbfa593848b3daa73aa72f65c8fbe Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim.demaille@gmail.com>
Date: Mon, 20 May 2019 06:27:55 +0200
Subject: [PATCH] c++: beware of to_string portability issues

Reported by Bruno Haible.
http://lists.gnu.org/archive/html/bug-bison/2019-05/msg00033.html

* m4/bison-cxx-std.m4 (_BISON_CXXSTD_11_snippet): Check it.
---
 m4/bison-cxx-std.m4 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/m4/bison-cxx-std.m4 b/m4/bison-cxx-std.m4
index 1756c7d9..afef998a 100644
--- a/m4/bison-cxx-std.m4
+++ b/m4/bison-cxx-std.m4
@@ -63,6 +63,9 @@ m4_define([_BISON_CXXSTD_11_snippet],
     for (int r: std::set<int>{1, 2})
       continue;
   }
+
+  // GCC 4.8.2 on Solaris 11.3 does not support to_string.
+  auto e = std::to_string(42);
 ])
 
 m4_define([_BISON_CXXSTD_14_snippet],