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 #ifndef __has_cpp_attribute 31 #define __has_cpp_attribute(x) 0 32 #endif 33 34 #if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS) 35 # define BOOST_NO_EXCEPTIONS 36 #endif 37 38 #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI) 39 # define BOOST_NO_RTTI 40 #endif 41 42 #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID) 43 # define BOOST_NO_TYPEID 44 #endif 45 46 #if !__has_feature(cxx_thread_local) 47 # define BOOST_NO_CXX11_THREAD_LOCAL 48 #endif 49 50 #ifdef __is_identifier 51 #if !__is_identifier(__int64) && !defined(__GNUC__) 52 # define BOOST_HAS_MS_INT64 53 #endif 54 #endif 55 56 #if __has_include(<stdint.h>) 57 # define BOOST_HAS_STDINT_H 58 #endif 59 60 61 #define BOOST_HAS_NRVO 62 63 // Branch prediction hints 64 #if !defined (__c2__) && defined(__has_builtin) 65 #if __has_builtin(__builtin_expect) 66 #define BOOST_LIKELY(x) __builtin_expect(x, 1) 67 #define BOOST_UNLIKELY(x) __builtin_expect(x, 0) 68 #endif 69 #endif 70 71 // Clang supports "long long" in all compilation modes. 72 #define BOOST_HAS_LONG_LONG 73 74 // 75 // We disable this if the compiler is really nvcc with C++03 as it 76 // doesn't actually support __int128 as of CUDA_VERSION=7500 77 // even though it defines __SIZEOF_INT128__. 78 // See https://svn.boost.org/trac/boost/ticket/10418 79 // https://svn.boost.org/trac/boost/ticket/11852 80 // Only re-enable this for nvcc if you're absolutely sure 81 // of the circumstances under which it's supported. 82 // Similarly __SIZEOF_INT128__ is defined when targetting msvc 83 // compatibility even though the required support functions are absent. 84 // 85 #if defined(__CUDACC__) 86 # if defined(BOOST_GCC_CXX11) 87 # define BOOST_NVCC_CXX11 88 # else 89 # define BOOST_NVCC_CXX03 90 # endif 91 #endif 92 93 #if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER) 94 # define BOOST_HAS_INT128 95 #endif 96 97 98 // 99 // Dynamic shared object (DSO) and dynamic-link library (DLL) support 100 // 101 #if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32) 102 # define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default"))) 103 # define BOOST_SYMBOL_IMPORT 104 # define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default"))) 105 #endif 106 107 // 108 // The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through 109 // between switch labels. 110 // 111 #if __cplusplus >= 201103L && defined(__has_warning) 112 # if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough") 113 # define BOOST_FALLTHROUGH [[clang::fallthrough]] 114 # endif 115 #endif 116 117 #if !__has_feature(cxx_auto_type) 118 # define BOOST_NO_CXX11_AUTO_DECLARATIONS 119 # define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS 120 #endif 121 122 // 123 // Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t 124 // 125 #if (defined(_MSC_VER) && (_MSC_VER < 1900)) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L) 126 # define BOOST_NO_CXX11_CHAR16_T 127 # define BOOST_NO_CXX11_CHAR32_T 128 #endif 129 130 #if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__) 131 #define BOOST_HAS_EXPM1 132 #define BOOST_HAS_LOG1P 133 #endif 134 135 #if !__has_feature(cxx_constexpr) 136 # define BOOST_NO_CXX11_CONSTEXPR 137 #endif 138 139 #if !__has_feature(cxx_decltype) 140 # define BOOST_NO_CXX11_DECLTYPE 141 #endif 142 143 #if !__has_feature(cxx_decltype_incomplete_return_types) 144 # define BOOST_NO_CXX11_DECLTYPE_N3276 145 #endif 146 147 #if !__has_feature(cxx_defaulted_functions) 148 # define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS 149 #endif 150 151 #if !__has_feature(cxx_deleted_functions) 152 # define BOOST_NO_CXX11_DELETED_FUNCTIONS 153 #endif 154 155 #if !__has_feature(cxx_explicit_conversions) 156 # define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS 157 #endif 158 159 #if !__has_feature(cxx_default_function_template_args) 160 # define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS 161 #endif 162 163 #if !__has_feature(cxx_generalized_initializers) 164 # define BOOST_NO_CXX11_HDR_INITIALIZER_LIST 165 #endif 166 167 #if !__has_feature(cxx_lambdas) 168 # define BOOST_NO_CXX11_LAMBDAS 169 #endif 170 171 #if !__has_feature(cxx_local_type_template_args) 172 # define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS 173 #endif 174 175 #if !__has_feature(cxx_noexcept) 176 # define BOOST_NO_CXX11_NOEXCEPT 177 #endif 178 179 #if !__has_feature(cxx_nullptr) 180 # define BOOST_NO_CXX11_NULLPTR 181 #endif 182 183 #if !__has_feature(cxx_range_for) 184 # define BOOST_NO_CXX11_RANGE_BASED_FOR 185 #endif 186 187 #if !__has_feature(cxx_raw_string_literals) 188 # define BOOST_NO_CXX11_RAW_LITERALS 189 #endif 190 191 #if !__has_feature(cxx_reference_qualified_functions) 192 # define BOOST_NO_CXX11_REF_QUALIFIERS 193 #endif 194 195 #if !__has_feature(cxx_generalized_initializers) 196 # define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX 197 #endif 198 199 #if !__has_feature(cxx_rvalue_references) 200 # define BOOST_NO_CXX11_RVALUE_REFERENCES 201 #endif 202 203 #if !__has_feature(cxx_strong_enums) 204 # define BOOST_NO_CXX11_SCOPED_ENUMS 205 #endif 206 207 #if !__has_feature(cxx_static_assert) 208 # define BOOST_NO_CXX11_STATIC_ASSERT 209 #endif 210 211 #if !__has_feature(cxx_alias_templates) 212 # define BOOST_NO_CXX11_TEMPLATE_ALIASES 213 #endif 214 215 #if !__has_feature(cxx_unicode_literals) 216 # define BOOST_NO_CXX11_UNICODE_LITERALS 217 #endif 218 219 #if !__has_feature(cxx_variadic_templates) 220 # define BOOST_NO_CXX11_VARIADIC_TEMPLATES 221 #endif 222 223 #if !__has_feature(cxx_user_literals) 224 # define BOOST_NO_CXX11_USER_DEFINED_LITERALS 225 #endif 226 227 #if !__has_feature(cxx_alignas) 228 # define BOOST_NO_CXX11_ALIGNAS 229 #endif 230 231 #if !__has_feature(cxx_trailing_return) 232 # define BOOST_NO_CXX11_TRAILING_RESULT_TYPES 233 #endif 234 235 #if !__has_feature(cxx_inline_namespaces) 236 # define BOOST_NO_CXX11_INLINE_NAMESPACES 237 #endif 238 239 #if !__has_feature(cxx_override_control) 240 # define BOOST_NO_CXX11_FINAL 241 #endif 242 243 #if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__)) 244 # define BOOST_NO_CXX14_BINARY_LITERALS 245 #endif 246 247 #if !__has_feature(__cxx_decltype_auto__) 248 # define BOOST_NO_CXX14_DECLTYPE_AUTO 249 #endif 250 251 #if !__has_feature(__cxx_aggregate_nsdmi__) 252 # define BOOST_NO_CXX14_AGGREGATE_NSDMI 253 #endif 254 255 #if !__has_feature(__cxx_init_captures__) 256 # define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES 257 #endif 258 259 #if !__has_feature(__cxx_generic_lambdas__) 260 # define BOOST_NO_CXX14_GENERIC_LAMBDAS 261 #endif 262 263 // clang < 3.5 has a defect with dependent type, like following. 264 // 265 // template <class T> 266 // constexpr typename enable_if<pred<T> >::type foo(T &) 267 // { } // error: no return statement in constexpr function 268 // 269 // This issue also affects C++11 mode, but C++11 constexpr requires return stmt. 270 // Therefore we don't care such case. 271 // 272 // Note that we can't check Clang version directly as the numbering system changes depending who's 273 // creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873) 274 // so instead verify that we have a feature that was introduced at the same time as working C++14 275 // constexpr (generic lambda's in this case): 276 // 277 #if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__) 278 # define BOOST_NO_CXX14_CONSTEXPR 279 #endif 280 281 #if !__has_feature(__cxx_return_type_deduction__) 282 # define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION 283 #endif 284 285 #if !__has_feature(__cxx_variable_templates__) 286 # define BOOST_NO_CXX14_VARIABLE_TEMPLATES 287 #endif 288 289 #if !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606) 290 # define BOOST_NO_CXX17_STRUCTURED_BINDINGS 291 #endif 292 293 // Clang 3.9+ in c++1z 294 #if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L 295 # define BOOST_NO_CXX17_INLINE_VARIABLES 296 # define BOOST_NO_CXX17_FOLD_EXPRESSIONS 297 #endif 298 299 #if __cplusplus < 201103L 300 #define BOOST_NO_CXX11_SFINAE_EXPR 301 #endif 302 303 #if __cplusplus < 201400 304 // All versions with __cplusplus above this value seem to support this: 305 # define BOOST_NO_CXX14_DIGIT_SEPARATORS 306 #endif 307 // 308 // __builtin_unreachable: 309 #if defined(__has_builtin) && __has_builtin(__builtin_unreachable) 310 #define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable(); 311 #endif 312 313 #if (__clang_major__ == 3) && (__clang_minor__ == 0) 314 // Apparently a clang bug: 315 # define BOOST_NO_CXX11_FIXED_LENGTH_VARIADIC_TEMPLATE_EXPANSION_PACKS 316 #endif 317 318 // Clang has supported the 'unused' attribute since the first release. 319 #define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__)) 320 321 #ifndef BOOST_COMPILER 322 # define BOOST_COMPILER "Clang version " __clang_version__ 323 #endif 324 325 // Macro used to identify the Clang compiler. 326 #define BOOST_CLANG 1 327 328