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+// (C) Copyright Douglas Gregor 2010
+//
+// 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)
+
+// See http://www.boost.org for most recent version.
+
+// compiler setup for IBM XL C/C++ for Linux (Little Endian) based on clang.
+
+#define BOOST_HAS_PRAGMA_ONCE
+
+// Detecting `-fms-extension` compiler flag assuming that _MSC_VER defined when that flag is used.
+#if defined (_MSC_VER) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 4))
+# define BOOST_HAS_PRAGMA_DETECT_MISMATCH
+#endif
+
+// When compiling with clang before __has_extension was defined,
+// even if one writes 'defined(__has_extension) && __has_extension(xxx)',
+// clang reports a compiler error. So the only workaround found is:
+
+#ifndef __has_extension
+#define __has_extension __has_feature
+#endif
+
+#if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
+# define BOOST_NO_EXCEPTIONS
+#endif
+
+#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI)
+# define BOOST_NO_RTTI
+#endif
+
+#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID)
+# define BOOST_NO_TYPEID
+#endif
+
+#if defined(__int64) && !defined(__GNUC__)
+# define BOOST_HAS_MS_INT64
+#endif
+
+#define BOOST_HAS_NRVO
+
+// Branch prediction hints
+#if defined(__has_builtin)
+#if __has_builtin(__builtin_expect)
+#define BOOST_LIKELY(x) __builtin_expect(x, 1)
+#define BOOST_UNLIKELY(x) __builtin_expect(x, 0)
+#endif
+#endif
+
+// Clang supports "long long" in all compilation modes.
+#define BOOST_HAS_LONG_LONG
+
+//
+// Dynamic shared object (DSO) and dynamic-link library (DLL) support
+//
+#if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
+# define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
+# define BOOST_SYMBOL_IMPORT
+# define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
+#endif
+
+//
+// The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
+// between switch labels.
+//
+#if __cplusplus >= 201103L && defined(__has_warning)
+# if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
+# define BOOST_FALLTHROUGH [[clang::fallthrough]]
+# endif
+#endif
+
+#if !__has_feature(cxx_auto_type)
+# define BOOST_NO_CXX11_AUTO_DECLARATIONS
+# define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
+#endif
+
+//
+// Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
+//
+#if defined(_MSC_VER) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
+# define BOOST_NO_CXX11_CHAR16_T
+# define BOOST_NO_CXX11_CHAR32_T
+#endif
+
+#if !__has_feature(cxx_constexpr)
+# define BOOST_NO_CXX11_CONSTEXPR
+#endif
+
+#if !__has_feature(cxx_decltype)
+# define BOOST_NO_CXX11_DECLTYPE
+#endif
+
+#if !__has_feature(cxx_decltype_incomplete_return_types)
+# define BOOST_NO_CXX11_DECLTYPE_N3276
+#endif
+
+#if !__has_feature(cxx_defaulted_functions)
+# define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
+#endif
+
+#if !__has_feature(cxx_deleted_functions)
+# define BOOST_NO_CXX11_DELETED_FUNCTIONS
+#endif
+
+#if !__has_feature(cxx_explicit_conversions)
+# define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
+#endif
+
+#if !__has_feature(cxx_default_function_template_args)
+# define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
+#endif
+
+#if !__has_feature(cxx_generalized_initializers)
+# define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
+#endif
+
+#if !__has_feature(cxx_lambdas)
+# define BOOST_NO_CXX11_LAMBDAS
+#endif
+
+#if !__has_feature(cxx_local_type_template_args)
+# define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
+#endif
+
+#if !__has_feature(cxx_noexcept)
+# define BOOST_NO_CXX11_NOEXCEPT
+#endif
+
+#if !__has_feature(cxx_nullptr)
+# define BOOST_NO_CXX11_NULLPTR
+#endif
+
+#if !__has_feature(cxx_range_for)
+# define BOOST_NO_CXX11_RANGE_BASED_FOR
+#endif
+
+#if !__has_feature(cxx_raw_string_literals)
+# define BOOST_NO_CXX11_RAW_LITERALS
+#endif
+
+#if !__has_feature(cxx_reference_qualified_functions)
+# define BOOST_NO_CXX11_REF_QUALIFIERS
+#endif
+
+#if !__has_feature(cxx_generalized_initializers)
+# define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+#endif
+
+#if !__has_feature(cxx_rvalue_references)
+# define BOOST_NO_CXX11_RVALUE_REFERENCES
+#endif
+
+#if !__has_feature(cxx_strong_enums)
+# define BOOST_NO_CXX11_SCOPED_ENUMS
+#endif
+
+#if !__has_feature(cxx_static_assert)
+# define BOOST_NO_CXX11_STATIC_ASSERT
+#endif
+
+#if !__has_feature(cxx_alias_templates)
+# define BOOST_NO_CXX11_TEMPLATE_ALIASES
+#endif
+
+#if !__has_feature(cxx_unicode_literals)
+# define BOOST_NO_CXX11_UNICODE_LITERALS
+#endif
+
+#if !__has_feature(cxx_variadic_templates)
+# define BOOST_NO_CXX11_VARIADIC_TEMPLATES
+#endif
+
+#if !__has_feature(cxx_user_literals)
+# define BOOST_NO_CXX11_USER_DEFINED_LITERALS
+#endif
+
+#if !__has_feature(cxx_alignas)
+# define BOOST_NO_CXX11_ALIGNAS
+#endif
+
+#if !__has_feature(cxx_trailing_return)
+# define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
+#endif
+
+#if !__has_feature(cxx_inline_namespaces)
+# define BOOST_NO_CXX11_INLINE_NAMESPACES
+#endif
+
+#if !__has_feature(cxx_override_control)
+# define BOOST_NO_CXX11_FINAL
+#endif
+
+#if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__))
+# define BOOST_NO_CXX14_BINARY_LITERALS
+#endif
+
+#if !__has_feature(__cxx_decltype_auto__)
+# define BOOST_NO_CXX14_DECLTYPE_AUTO
+#endif
+
+#if !__has_feature(__cxx_aggregate_nsdmi__)
+# define BOOST_NO_CXX14_AGGREGATE_NSDMI
+#endif
+
+#if !__has_feature(__cxx_init_captures__)
+# define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
+#endif
+
+#if !__has_feature(__cxx_generic_lambdas__)
+# define BOOST_NO_CXX14_GENERIC_LAMBDAS
+#endif
+
+// clang < 3.5 has a defect with dependent type, like following.
+//
+// template <class T>
+// constexpr typename enable_if<pred<T> >::type foo(T &)
+// { } // error: no return statement in constexpr function
+//
+// This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
+// Therefore we don't care such case.
+//
+// Note that we can't check Clang version directly as the numbering system changes depending who's
+// creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
+// so instead verify that we have a feature that was introduced at the same time as working C++14
+// constexpr (generic lambda's in this case):
+//
+#if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__)
+# define BOOST_NO_CXX14_CONSTEXPR
+#endif
+
+#if !__has_feature(__cxx_return_type_deduction__)
+# define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
+#endif
+
+#if !__has_feature(__cxx_variable_templates__)
+# define BOOST_NO_CXX14_VARIABLE_TEMPLATES
+#endif
+
+#if __cplusplus < 201400
+// All versions with __cplusplus above this value seem to support this:
+# define BOOST_NO_CXX14_DIGIT_SEPARATORS
+#endif
+
+
+// Unused attribute:
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+# define BOOST_ATTRIBUTE_UNUSED __attribute__((unused))
+#endif
+
+#ifndef BOOST_COMPILER
+# define BOOST_COMPILER "Clang version " __clang_version__
+#endif
+
+// Macro used to identify the Clang compiler.
+#define BOOST_CLANG 1
+