From aa126e178bcb6c7f48e45ac8f5c1c8aac8751cfd Mon Sep 17 00:00:00 2001
From: Olivier Parcollet <olivier.parcollet@cea.fr>
Date: Sun, 8 Jun 2014 19:18:39 +0200
Subject: [PATCH] update for xcode 5.1.1

- clang 3.4 on default Os X.
- automatically in C++14 mode.
- a little fix in clef (var >> ...) because of an apparent bug in auto
  detection in clang.
---
 cmake/FindCompilerCheck.cmake | 2 +-
 triqs/clef/clef.c14.hpp       | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/cmake/FindCompilerCheck.cmake b/cmake/FindCompilerCheck.cmake
index 7b0af8ba..bdc9daba 100644
--- a/cmake/FindCompilerCheck.cmake
+++ b/cmake/FindCompilerCheck.cmake
@@ -47,7 +47,7 @@ elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
 
  # does not always work ... To be fixed when clang 3.4 officially released and on OS X.
  if(NOT compiler_version VERSION_LESS "3.4")
-  #set (compiler_is_c14 ON)
+  set (compiler_is_c14 ON)
  endif()
 
 elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel")
diff --git a/triqs/clef/clef.c14.hpp b/triqs/clef/clef.c14.hpp
index 55755a4d..21e51589 100644
--- a/triqs/clef/clef.c14.hpp
+++ b/triqs/clef/clef.c14.hpp
@@ -380,7 +380,8 @@ namespace triqs { namespace clef {
  template<int ... N> ph_list<N...> var( placeholder<N> ...) { return {};}
 
  template<typename Expr, int ... N> 
-  decltype(auto) operator >> (ph_list<N...>, Expr const & ex)  { return  make_function(ex, placeholder<N>()...);}
+  auto operator >> (ph_list<N...> &&, Expr const & ex) ->decltype(make_function(ex, placeholder<N>()...)) { return  make_function(ex, placeholder<N>()...);}
+  // add trailing as a workaround around a clang bug here on xcode 5.1.1 (?)
 
  /* --------------------------------------------------------------------------------------------------
   *  make_function