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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.

// Clang compiler setup.

#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

#ifndef __has_attribute
#define __has_attribute(x) 0
#endif

#ifndef __has_cpp_attribute
#define __has_cpp_attribute(x) 0
#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 !__has_feature(cxx_thread_local)
#  define BOOST_NO_CXX11_THREAD_LOCAL
#endif

#ifdef __is_identifier
#if !__is_identifier(__int64) && !defined(__GNUC__)
#  define BOOST_HAS_MS_INT64
#endif
#endif

#if __has_include(<stdint.h>)
#  define BOOST_HAS_STDINT_H
#endif


#define BOOST_HAS_NRVO

// Branch prediction hints
#if !defined (__c2__) && 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

//
// We disable this if the compiler is really nvcc with C++03 as it
// doesn't actually support __int128 as of CUDA_VERSION=7500
// even though it defines __SIZEOF_INT128__.
// See https://svn.boost.org/trac/boost/ticket/10418
//     https://svn.boost.org/trac/boost/ticket/11852
// Only re-enable this for nvcc if you're absolutely sure
// of the circumstances under which it's supported.
// Similarly __SIZEOF_INT128__ is defined when targetting msvc
// compatibility even though the required support functions are absent.
//
#if defined(__CUDACC__)
#  if defined(BOOST_GCC_CXX11)
#    define BOOST_NVCC_CXX11
#  else
#    define BOOST_NVCC_CXX03
#  endif
#endif

#if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER)
#  define BOOST_HAS_INT128
#endif


//
// Dynamic shared object (DSO) and dynamic-link library (DLL) support
//
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
#  define BOOST_HAS_DECLSPEC
#  define BOOST_SYMBOL_EXPORT __attribute__((__dllexport__))
#  define BOOST_SYMBOL_IMPORT __attribute__((__dllimport__))
#else
#  define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))