boost/config/compiler/clang.hpp
// (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 #if (defined(linux) || defined(__linux) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__)) && !defined(_CRAYC) #if (__clang_major__ >= 4) && defined(__has_include) #if __has_include(<quadmath.h>) # define BOOST_HAS_FLOAT128 #endif #endif #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"))) # define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default"))) # define BOOST_SYMBOL_IMPORT #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) && (_MSC_VER < 1900)) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L) # define BOOST_NO_CXX11_CHAR16_T # define BOOST_NO_CXX11_CHAR32_T #endif #if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__) #define BOOST_HAS_EXPM1 #define BOOST_HAS_LOG1P #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 !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606) # define BOOST_NO_CXX17_STRUCTURED_BINDINGS #endif #if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606) # define BOOST_NO_CXX17_IF_CONSTEXPR #endif // Clang 3.9+ in c++1z #if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L # define BOOST_NO_CXX17_INLINE_VARIABLES # define BOOST_NO_CXX17_FOLD_EXPRESSIONS #endif #if __cplusplus < 201103L #define BOOST_NO_CXX11_SFINAE_EXPR #endif #if __cplusplus < 201400 // All versions with __cplusplus above this value seem to support this: # define BOOST_NO_CXX14_DIGIT_SEPARATORS #endif // // __builtin_unreachable: #if defined(__has_builtin) && __has_builtin(__builtin_unreachable) #define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable(); #endif #if (__clang_major__ == 3) && (__clang_minor__ == 0) // Apparently a clang bug: # define BOOST_NO_CXX11_FIXED_LENGTH_VARIADIC_TEMPLATE_EXPANSION_PACKS #endif // Clang has supported the 'unused' attribute since the first release. #define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__)) // Type aliasing hint. #if __has_attribute(__may_alias__) # define BOOST_MAY_ALIAS __attribute__((__may_alias__)) #endif #ifndef BOOST_COMPILER # define BOOST_COMPILER "Clang version " __clang_version__ #endif // Macro used to identify the Clang compiler. #define BOOST_CLANG 1