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include/boost/config/compiler/clang.hpp  view on Meta::CPAN

// 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