3rdparty/boost/boost/config/compiler/clang.hpp

   1 // (C) Copyright Douglas Gregor 2010
   2 //
   3 //  Use, modification and distribution are subject to the
   4 //  Boost Software License, Version 1.0. (See accompanying file
   5 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 //  See http://www.boost.org for most recent version.
   8
   9 // Clang compiler setup.
  10
  11 #define BOOST_HAS_PRAGMA_ONCE
  12
  13 // Detecting `-fms-extension` compiler flag assuming that _MSC_VER defined when that flag is used.
  14 #if defined (_MSC_VER) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 4))
  15 #   define BOOST_HAS_PRAGMA_DETECT_MISMATCH
  16 #endif
  17
  18 // When compiling with clang before __has_extension was defined,
  19 // even if one writes 'defined(__has_extension) && __has_extension(xxx)',
  20 // clang reports a compiler error. So the only workaround found is:
  21
  22 #ifndef __has_extension
  23 #define __has_extension __has_feature
  24 #endif
  25
  26 #ifndef __has_attribute
  27 #define __has_attribute(x) 0
  28 #endif
  29
  30 #if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
  31 #  define BOOST_NO_EXCEPTIONS
  32 #endif
  33
  34 #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI)
  35 #  define BOOST_NO_RTTI
  36 #endif
  37
  38 #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID)
  39 #  define BOOST_NO_TYPEID
  40 #endif
  41
  42 #if defined(__int64) && !defined(__GNUC__)
  43 #  define BOOST_HAS_MS_INT64
  44 #endif
  45
  46 #define BOOST_HAS_NRVO
  47
  48 // Branch prediction hints
  49 #if defined(__has_builtin)
  50 #if __has_builtin(__builtin_expect)
  51 #define BOOST_LIKELY(x) __builtin_expect(x, 1)
  52 #define BOOST_UNLIKELY(x) __builtin_expect(x, 0)
  53 #endif
  54 #endif
  55
  56 // Clang supports "long long" in all compilation modes.
  57 #define BOOST_HAS_LONG_LONG
  58
  59 //
  60 // We disable this if the compiler is really nvcc as it
  61 // doesn't actually support __int128 as of CUDA_VERSION=5000
  62 // even though it defines __SIZEOF_INT128__.
  63 // See https://svn.boost.org/trac/boost/ticket/10418
  64 // Only re-enable this for nvcc if you're absolutely sure
  65 // of the circumstances under which it's supported.
  66 // Similarly __SIZEOF_INT128__ is defined when targetting msvc
  67 // compatibility even though the required support functions are absent.
  68 //
  69 #if defined(__SIZEOF_INT128__) && !defined(__CUDACC__) && !defined(_MSC_VER)
  70 #  define BOOST_HAS_INT128
  71 #endif
  72
  73
  74 //
  75 // Dynamic shared object (DSO) and dynamic-link library (DLL) support
  76 //
  77 #if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
  78 #  define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
  79 #  define BOOST_SYMBOL_IMPORT
  80 #  define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
  81 #endif
  82
  83 //
  84 // The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
  85 // between switch labels.
  86 //
  87 #if __cplusplus >= 201103L && defined(__has_warning)
  88 #  if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
  89 #    define BOOST_FALLTHROUGH [[clang::fallthrough]]
  90 #  endif
  91 #endif
  92
  93 #if !__has_feature(cxx_auto_type)
  94 #  define BOOST_NO_CXX11_AUTO_DECLARATIONS
  95 #  define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
  96 #endif
  97
  98 //
  99 // Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
 100 //
 101 #if defined(_MSC_VER) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
 102 #  define BOOST_NO_CXX11_CHAR16_T
 103 #  define BOOST_NO_CXX11_CHAR32_T
 104 #endif
 105
 106 #if !__has_feature(cxx_constexpr)
 107 #  define BOOST_NO_CXX11_CONSTEXPR
 108 #endif
 109
 110 #if !__has_feature(cxx_decltype)
 111 #  define BOOST_NO_CXX11_DECLTYPE
 112 #endif
 113
 114 #if !__has_feature(cxx_decltype_incomplete_return_types)
 115 #  define BOOST_NO_CXX11_DECLTYPE_N3276
 116 #endif
 117
 118 #if !__has_feature(cxx_defaulted_functions)
 119 #  define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
 120 #endif
 121
 122 #if !__has_feature(cxx_deleted_functions)
 123 #  define BOOST_NO_CXX11_DELETED_FUNCTIONS
 124 #endif
 125
 126 #if !__has_feature(cxx_explicit_conversions)
 127 #  define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
 128 #endif
 129
 130 #if !__has_feature(cxx_default_function_template_args)
 131 #  define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
 132 #endif
 133
 134 #if !__has_feature(cxx_generalized_initializers)
 135 #  define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
 136 #endif
 137
 138 #if !__has_feature(cxx_lambdas)
 139 #  define BOOST_NO_CXX11_LAMBDAS
 140 #endif
 141
 142 #if !__has_feature(cxx_local_type_template_args)
 143 #  define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
 144 #endif
 145
 146 #if !__has_feature(cxx_noexcept)
 147 #  define BOOST_NO_CXX11_NOEXCEPT
 148 #endif
 149
 150 #if !__has_feature(cxx_nullptr)
 151 #  define BOOST_NO_CXX11_NULLPTR
 152 #endif
 153
 154 #if !__has_feature(cxx_range_for)
 155 #  define BOOST_NO_CXX11_RANGE_BASED_FOR
 156 #endif
 157
 158 #if !__has_feature(cxx_raw_string_literals)
 159 #  define BOOST_NO_CXX11_RAW_LITERALS
 160 #endif
 161
 162 #if !__has_feature(cxx_reference_qualified_functions)
 163 #  define BOOST_NO_CXX11_REF_QUALIFIERS
 164 #endif
 165
 166 #if !__has_feature(cxx_generalized_initializers)
 167 #  define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
 168 #endif
 169
 170 #if !__has_feature(cxx_rvalue_references)
 171 #  define BOOST_NO_CXX11_RVALUE_REFERENCES
 172 #endif
 173
 174 #if !__has_feature(cxx_strong_enums)
 175 #  define BOOST_NO_CXX11_SCOPED_ENUMS
 176 #endif
 177
 178 #if !__has_feature(cxx_static_assert)
 179 #  define BOOST_NO_CXX11_STATIC_ASSERT
 180 #endif
 181
 182 #if !__has_feature(cxx_alias_templates)
 183 #  define BOOST_NO_CXX11_TEMPLATE_ALIASES
 184 #endif
 185
 186 #if !__has_feature(cxx_unicode_literals)
 187 #  define BOOST_NO_CXX11_UNICODE_LITERALS
 188 #endif
 189
 190 #if !__has_feature(cxx_variadic_templates)
 191 #  define BOOST_NO_CXX11_VARIADIC_TEMPLATES
 192 #endif
 193
 194 #if !__has_feature(cxx_user_literals)
 195 #  define BOOST_NO_CXX11_USER_DEFINED_LITERALS
 196 #endif
 197
 198 #if !__has_feature(cxx_alignas)
 199 #  define BOOST_NO_CXX11_ALIGNAS
 200 #endif
 201
 202 #if !__has_feature(cxx_trailing_return)
 203 #  define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
 204 #endif
 205
 206 #if !__has_feature(cxx_inline_namespaces)
 207 #  define BOOST_NO_CXX11_INLINE_NAMESPACES
 208 #endif
 209
 210 #if !__has_feature(cxx_override_control)
 211 #  define BOOST_NO_CXX11_FINAL
 212 #endif
 213
 214 #if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__))
 215 #  define BOOST_NO_CXX14_BINARY_LITERALS
 216 #endif
 217
 218 #if !__has_feature(__cxx_decltype_auto__)
 219 #  define BOOST_NO_CXX14_DECLTYPE_AUTO
 220 #endif
 221
 222 #if !__has_feature(__cxx_aggregate_nsdmi__)
 223 #  define BOOST_NO_CXX14_AGGREGATE_NSDMI
 224 #endif
 225
 226 #if !__has_feature(__cxx_init_captures__)
 227 #  define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
 228 #endif
 229
 230 #if !__has_feature(__cxx_generic_lambdas__)
 231 #  define BOOST_NO_CXX14_GENERIC_LAMBDAS
 232 #endif
 233
 234 // clang < 3.5 has a defect with dependent type, like following.
 235 //
 236 //  template <class T>
 237 //  constexpr typename enable_if<pred<T> >::type foo(T &)
 238 //  { } // error: no return statement in constexpr function
 239 //
 240 // This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
 241 // Therefore we don't care such case.
 242 //
 243 // Note that we can't check Clang version directly as the numbering system changes depending who's
 244 // creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
 245 // so instead verify that we have a feature that was introduced at the same time as working C++14
 246 // constexpr (generic lambda's in this case):
 247 //
 248 #if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__)
 249 #  define BOOST_NO_CXX14_CONSTEXPR
 250 #endif
 251
 252 #if !__has_feature(__cxx_return_type_deduction__)
 253 #  define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
 254 #endif
 255
 256 #if !__has_feature(__cxx_variable_templates__)
 257 #  define BOOST_NO_CXX14_VARIABLE_TEMPLATES
 258 #endif
 259
 260 #if __cplusplus < 201400
 261 // All versions with __cplusplus above this value seem to support this:
 262 #  define BOOST_NO_CXX14_DIGIT_SEPARATORS
 263 #endif
 264 //
 265 // __builtin_unreachable:
 266 #if defined(__has_builtin) && __has_builtin(__builtin_unreachable)
 267 #define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable();
 268 #endif
 269
 270 // Clang has supported the 'unused' attribute since the first release.
 271 #define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))
 272
 273 #ifndef BOOST_COMPILER
 274 #  define BOOST_COMPILER "Clang version " __clang_version__
 275 #endif
 276
 277 // Macro used to identify the Clang compiler.
 278 #define BOOST_CLANG 1
 279