From 4d17d6213dd6704caf60997093c8db0b36af14a6 Mon Sep 17 00:00:00 2001
From: Alexey Sokolov <alexey+znc@asokolov.org>
Date: Wed, 4 Feb 2015 22:49:18 +0000
Subject: [PATCH] Fix non-compilation with clang 3.1

---
 m4/ax_cxx_compile_stdcxx_11.m4 | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4
index 163a4c64..7ad01e03 100644
--- a/m4/ax_cxx_compile_stdcxx_11.m4
+++ b/m4/ax_cxx_compile_stdcxx_11.m4
@@ -27,14 +27,14 @@
 #   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
 #   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
 #   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
-#   Copyright (c) 2014 Alexey Sokolov <sokolov@google.com>
+#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 4
+#serial 5
 
 m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [[
   template <typename T>
@@ -61,6 +61,25 @@ m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [[
 
     auto d = a;
     auto l = [](){};
+
+    // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+    // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function because of this
+    namespace test_template_alias_sfinae {
+        struct foo {};
+
+        template<typename T>
+        using member = typename T::member_type;
+
+        template<typename T>
+        void func(...) {}
+
+        template<typename T>
+        void func(member<T>*) {}
+
+        void test() {
+            func<foo>(0);
+        }
+    }
 ]])
 
 AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl