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 with C++03 as it
  61 // doesn't actually support __int128 as of CUDA_VERSION=7500
  62 // even though it defines __SIZEOF_INT128__.
  63 // See https://svn.boost.org/trac/boost/ticket/10418
  64 //     https://svn.boost.org/trac/boost/ticket/11852
  65 // Only re-enable this for nvcc if you're absolutely sure
  66 // of the circumstances under which it's supported.
  67 // Similarly __SIZEOF_INT128__ is defined when targetting msvc
  68 // compatibility even though the required support functions are absent.
  69 //
  70 #if defined(__CUDACC__)
  71 #  if defined(BOOST_GCC_CXX11)
  72 #    define BOOST_NVCC_CXX11
  73 #  else
  74 #    define BOOST_NVCC_CXX03
  75 #  endif
  76 #endif
  77
  78 #if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER)
  79 #  define BOOST_HAS_INT128
  80 #endif
  81
  82
  83 //
  84 // Dynamic shared object (DSO) and dynamic-link library (DLL) support
  85 //
  86 #if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
  87 #  define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
  88 #  define BOOST_SYMBOL_IMPORT
  89 #  define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
  90 #endif
  91
  92 //
  93 // The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
  94 // between switch labels.
  95 //
  96 #if __cplusplus >= 201103L && defined(__has_warning)
  97 #  if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
  98 #    define BOOST_FALLTHROUGH [[clang::fallthrough]]
  99 #  endif
 100 #endif
 101
 102 #if !__has_feature(cxx_auto_type)
 103 #  define BOOST_NO_CXX11_AUTO_DECLARATIONS
 104 #  define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
 105 #endif
 106
 107 //
 108 // Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
 109 //
 110 #if defined(_MSC_VER) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
 111 #  define BOOST_NO_CXX11_CHAR16_T
 112 #  define BOOST_NO_CXX11_CHAR32_T
 113 #endif
 114
 115 #if !__has_feature(cxx_constexpr)
 116 #  define BOOST_NO_CXX11_CONSTEXPR
 117 #endif
 118
 119 #if !__has_feature(cxx_decltype)
 120 #  define BOOST_NO_CXX11_DECLTYPE
 121 #endif
 122
 123 #if !__has_feature(cxx_decltype_incomplete_return_types)
 124 #  define BOOST_NO_CXX11_DECLTYPE_N3276
 125 #endif
 126
 127 #if !__has_feature(cxx_defaulted_functions)
 128 #  define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
 129 #endif
 130
 131 #if !__has_feature(cxx_deleted_functions)
 132 #  define BOOST_NO_CXX11_DELETED_FUNCTIONS
 133 #endif
 134
 135 #if !__has_feature(cxx_explicit_conversions)
 136 #  define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
 137 #endif
 138
 139 #if !__has_feature(cxx_default_function_template_args)
 140 #  define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
 141 #endif
 142
 143 #if !__has_feature(cxx_generalized_initializers)
 144 #  define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
 145 #endif
 146
 147 #if !__has_feature(cxx_lambdas)
 148 #  define BOOST_NO_CXX11_LAMBDAS
 149 #endif
 150
 151 #if !__has_feature(cxx_local_type_template_args)
 152 #  define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
 153 #endif
 154
 155 #if !__has_feature(cxx_noexcept)
 156 #  define BOOST_NO_CXX11_NOEXCEPT
 157 #endif
 158
 159 #if !__has_feature(cxx_nullptr)
 160 #  define BOOST_NO_CXX11_NULLPTR
 161 #endif
 162
 163 #if !__has_feature(cxx_range_for)
 164 #  define BOOST_NO_CXX11_RANGE_BASED_FOR
 165 #endif
 166
 167 #if !__has_feature(cxx_raw_string_literals)
 168 #  define BOOST_NO_CXX11_RAW_LITERALS
 169 #endif
 170
 171 #if !__has_feature(cxx_reference_qualified_functions)
 172 #  define BOOST_NO_CXX11_REF_QUALIFIERS
 173 #endif
 174
 175 #if !__has_feature(cxx_generalized_initializers)
 176 #  define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
 177 #endif
 178
 179 #if !__has_feature(cxx_rvalue_references)
 180 #  define BOOST_NO_CXX11_RVALUE_REFERENCES
 181 #endif
 182
 183 #if !__has_feature(cxx_strong_enums)
 184 #  define BOOST_NO_CXX11_SCOPED_ENUMS
 185 #endif
 186
 187 #if !__has_feature(cxx_static_assert)
 188 #  define BOOST_NO_CXX11_STATIC_ASSERT
 189 #endif
 190
 191 #if !__has_feature(cxx_alias_templates)
 192 #  define BOOST_NO_CXX11_TEMPLATE_ALIASES
 193 #endif
 194
 195 #if !__has_feature(cxx_unicode_literals)
 196 #  define BOOST_NO_CXX11_UNICODE_LITERALS
 197 #endif
 198
 199 #if !__has_feature(cxx_variadic_templates)
 200 #  define BOOST_NO_CXX11_VARIADIC_TEMPLATES
 201 #endif
 202
 203 #if !__has_feature(cxx_user_literals)
 204 #  define BOOST_NO_CXX11_USER_DEFINED_LITERALS
 205 #endif
 206
 207 #if !__has_feature(cxx_alignas)
 208 #  define BOOST_NO_CXX11_ALIGNAS
 209 #endif
 210
 211 #if !__has_feature(cxx_trailing_return)
 212 #  define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
 213 #endif
 214
 215 #if !__has_feature(cxx_inline_namespaces)
 216 #  define BOOST_NO_CXX11_INLINE_NAMESPACES
 217 #endif
 218
 219 #if !__has_feature(cxx_override_control)
 220 #  define BOOST_NO_CXX11_FINAL
 221 #endif
 222
 223 #if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__))
 224 #  define BOOST_NO_CXX14_BINARY_LITERALS
 225 #endif
 226
 227 #if !__has_feature(__cxx_decltype_auto__)
 228 #  define BOOST_NO_CXX14_DECLTYPE_AUTO
 229 #endif
 230
 231 #if !__has_feature(__cxx_aggregate_nsdmi__)
 232 #  define BOOST_NO_CXX14_AGGREGATE_NSDMI
 233 #endif
 234
 235 #if !__has_feature(__cxx_init_captures__)
 236 #  define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
 237 #endif
 238
 239 #if !__has_feature(__cxx_generic_lambdas__)
 240 #  define BOOST_NO_CXX14_GENERIC_LAMBDAS
 241 #endif
 242
 243 // clang < 3.5 has a defect with dependent type, like following.
 244 //
 245 //  template <class T>
 246 //  constexpr typename enable_if<pred<T> >::type foo(T &)
 247 //  { } // error: no return statement in constexpr function
 248 //
 249 // This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
 250 // Therefore we don't care such case.
 251 //
 252 // Note that we can't check Clang version directly as the numbering system changes depending who's
 253 // creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
 254 // so instead verify that we have a feature that was introduced at the same time as working C++14
 255 // constexpr (generic lambda's in this case):
 256 //
 257 #if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__)
 258 #  define BOOST_NO_CXX14_CONSTEXPR
 259 #endif
 260
 261 #if !__has_feature(__cxx_return_type_deduction__)
 262 #  define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
 263 #endif
 264
 265 #if !__has_feature(__cxx_variable_templates__)
 266 #  define BOOST_NO_CXX14_VARIABLE_TEMPLATES
 267 #endif
 268
 269 #if __cplusplus < 201400
 270 // All versions with __cplusplus above this value seem to support this:
 271 #  define BOOST_NO_CXX14_DIGIT_SEPARATORS
 272 #endif
 273 //
 274 // __builtin_unreachable:
 275 #if defined(__has_builtin) && __has_builtin(__builtin_unreachable)
 276 #define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable();
 277 #endif
 278
 279 // Clang has supported the 'unused' attribute since the first release.
 280 #define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))
 281
 282 #ifndef BOOST_COMPILER
 283 #  define BOOST_COMPILER "Clang version " __clang_version__
 284 #endif
 285
 286 // Macro used to identify the Clang compiler.
 287 #define BOOST_CLANG 1
 288