/* A GNU-like <math.h>.
- Copyright (C) 2002-2003, 2007-2013 Free Software Foundation, Inc.
+ Copyright (C) 2002-2003, 2007-2016 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#ifndef _@GUARD_PREFIX@_MATH_H
#define _@GUARD_PREFIX@_MATH_H
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
_GL_INLINE_HEADER_BEGIN
#ifndef _GL_MATH_INLINE
# define _GL_MATH_INLINE _GL_INLINE
#if @GNULIB_SIGNBIT@
-# if @REPLACE_SIGNBIT_USING_GCC@
+# if (@REPLACE_SIGNBIT_USING_GCC@ \
+ && (!defined __cplusplus || __cplusplus < 201103))
# undef signbit
/* GCC 4.0 and newer provides three built-ins for signbit. */
# define signbit(x) \