update boost

linx64/include/boost/math/tools/is_constant_evaluated.hpp

@@ -0,0 +1,51 @@
+//  Copyright John Maddock 2011-2021.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP
+#define BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP
+
+#include <boost/math/tools/config.hpp>
+
+#ifdef __has_include
+# if __has_include(<version>)
+#  include <version>
+#  ifdef __cpp_lib_is_constant_evaluated
+#   include <type_traits>
+#   define BOOST_MATH_HAS_IS_CONSTANT_EVALUATED
+#  endif
+# endif
+#endif
+
+#ifdef __has_builtin
+#  if __has_builtin(__builtin_is_constant_evaluated) && !defined(BOOST_NO_CXX14_CONSTEXPR) && !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
+#    define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED
+#  endif
+#endif
+//
+// MSVC also supports __builtin_is_constant_evaluated if it's recent enough:
+//
+#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 192528326)
+#  define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED
+#endif
+//
+// As does GCC-9:
+//
+#if !defined(BOOST_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 9) && !defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED)
+#  define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED
+#endif
+
+#if defined(BOOST_MATH_HAS_IS_CONSTANT_EVALUATED) && !defined(BOOST_NO_CXX14_CONSTEXPR)
+#  define BOOST_MATH_IS_CONSTANT_EVALUATED(x) std::is_constant_evaluated()
+#elif defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED)
+#  define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_is_constant_evaluated()
+#elif !defined(BOOST_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 6)
+#  define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_constant_p(x)
+#  define BOOST_MATH_USING_BUILTIN_CONSTANT_P
+#else
+#  define BOOST_MATH_IS_CONSTANT_EVALUATED(x) false
+#  define BOOST_MATH_NO_CONSTEXPR_DETECTION
+#endif
+
+#endif // BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP