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

// C++17
#if !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606)
#  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
#endif
#if !defined(__cpp_inline_variables) || (__cpp_inline_variables < 201606)
#  define BOOST_NO_CXX17_INLINE_VARIABLES
#endif
#if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
#  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
#endif
#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
#  define BOOST_NO_CXX17_IF_CONSTEXPR
#endif

#if __GNUC__ >= 7
#  define BOOST_FALLTHROUGH __attribute__((fallthrough))
#endif

#ifdef __MINGW32__
// Currently (June 2017) thread_local is broken on mingw for all current compiler releases, see
// https://sourceforge.net/p/mingw-w64/bugs/527/
// Not setting this causes program termination on thread exit.
#define BOOST_NO_CXX11_THREAD_LOCAL
#endif

//
// Unused attribute:
#if __GNUC__ >= 4
#  define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))
#endif

// Type aliasing hint. Supported since gcc 3.3.
#define BOOST_MAY_ALIAS __attribute__((__may_alias__))

//
// __builtin_unreachable:
#if BOOST_GCC_VERSION >= 40800
#define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable();
#endif

#ifndef BOOST_COMPILER
#  define BOOST_COMPILER "GNU C++ version " __VERSION__
#endif

// ConceptGCC compiler:
//   http://www.generic-programming.org/software/ConceptGCC/
#ifdef __GXX_CONCEPTS__
#  define BOOST_HAS_CONCEPTS
#  define BOOST_COMPILER "ConceptGCC version " __VERSION__
#endif

// versions check:
// we don't know gcc prior to version 3.30:
#if (BOOST_GCC_VERSION< 30300)
#  error "Compiler not configured - please reconfigure"
#endif
//
// last known and checked version is 7.1:
#if (BOOST_GCC_VERSION > 70100)
#  if defined(BOOST_ASSERT_CONFIG)
#     error "Boost.Config is older than your compiler - please check for an updated Boost release."
#  else
// we don't emit warnings here anymore since there are no defect macros defined for
// gcc post 3.4, so any failures are gcc regressions...
//#     warning "Unknown compiler version - please run the configure tests and report the results"
#  endif
#endif