On 03/10/2016 05:24 AM, Tobias Burnus wrote:
Ed Smith-Rowland wrote:
--- include/bits/specfun.h      
(svn+ssh://e...@gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/include) (working copy)
+++ svn+ssh://e...@gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/include       
(revision 234098)
@@ -1,6 +1,6 @@
  // Mathematical Special Functions for -*- C++ -*-
-// Copyright (C) 2006-2016 Free Software Foundation, Inc.
+// Copyright (C) 2006-2015 Free Software Foundation, Inc.
The patch looks reversed ("---" for the "working copy", copyright-year change 
reversed etc.)

Cheers,

Tobias

Third time's a charm.
(I accidentally checked these into my branch along with a general merge from trunk - hence my issues)

2016-03-10  Edward Smith-Rowland  <3dw...@verizon.net>

        Pull C++ Special Math into std for C++17.
        * include/bits/specfun.h: Allow special functions for C++17;
        define __cpp_lib_math_special_functions.
        * include/c_global/cmath: Allow special functions for C++17.
        * include/c_compatibility/math.h: Ditto

Index: include/bits/specfun.h
===================================================================
--- include/bits/specfun.h      
(svn+ssh://e...@gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/include) (revision 
234110)
+++ include/bits/specfun.h      (.../include)   (working copy)
@@ -1,6 +1,6 @@
 // Mathematical Special Functions for -*- C++ -*-
 
-// Copyright (C) 2006-2015 Free Software Foundation, Inc.
+// Copyright (C) 2006-2016 Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -34,15 +34,21 @@
 
 #include <bits/c++config.h>
 
-#if __STDCPP_WANT_MATH_SPEC_FUNCS__ == 0
+#define __STDCPP_MATH_SPEC_FUNCS__ 201003L
+
+#define __cpp_lib_math_special_functions 201603L
+
+#if __cplusplus <= 201402L && __STDCPP_WANT_MATH_SPEC_FUNCS__ == 0
 # error include <cmath> and define __STDCPP_WANT_MATH_SPEC_FUNCS__
 #endif
 
-#define __STDCPP_MATH_SPEC_FUNCS__ 201003L
-
+#include <limits>
 #include <bits/stl_algobase.h>
-#include <limits>
-#include <type_traits>
+#if __cplusplus >= 201103L
+#  include <type_traits>
+#else
+#  include <tr1/type_traits>
+#endif
 
 #include <tr1/gamma.tcc>
 #include <tr1/bessel_function.tcc>
Index: include/c_global/cmath
===================================================================
--- include/c_global/cmath      
(svn+ssh://e...@gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/include) (revision 
234110)
+++ include/c_global/cmath      (.../include)   (working copy)
@@ -1790,7 +1790,7 @@
 
 #endif // C++11
 
-#if __STDCPP_WANT_MATH_SPEC_FUNCS__ == 1
+#if __cplusplus > 201402L || __STDCPP_WANT_MATH_SPEC_FUNCS__ == 1
 #  include <bits/specfun.h>
 #endif
 
Index: include/c_compatibility/math.h
===================================================================
--- include/c_compatibility/math.h      
(svn+ssh://e...@gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/include) (revision 
234110)
+++ include/c_compatibility/math.h      (.../include)   (working copy)
@@ -111,7 +111,7 @@
 using std::trunc;
 #endif // C++11 && _GLIBCXX_USE_C99_MATH_TR1
 
-#if __STDCPP_WANT_MATH_SPEC_FUNCS__ == 1
+#if __cplusplus > 201402L || __STDCPP_WANT_MATH_SPEC_FUNCS__ == 1
 using std::assoc_laguerref;
 using std::assoc_laguerrel;
 using std::assoc_laguerre;

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