ceph/src/boost/boost/hana/config.hpp

   1 /*!
   2 @file
   3 Defines configuration macros used throughout the library.
   4
   5 @copyright Louis Dionne 2013-2017
   6 Distributed under the Boost Software License, Version 1.0.
   7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_HANA_CONFIG_HPP
  11 #define BOOST_HANA_CONFIG_HPP
  12
  13 #include <boost/hana/version.hpp>
  14
  15
  16 //////////////////////////////////////////////////////////////////////////////
  17 // Detect the compiler
  18 //////////////////////////////////////////////////////////////////////////////
  19
  20 #if defined(_MSC_VER) && !defined(__clang__) // MSVC
  21     // This must be checked first, because otherwise it produces a fatal
  22     // error due to unrecognized #warning directives used below.
  23 #   pragma message("Warning: the native Microsoft compiler is not supported due to lack of proper C++14 support.")
  24
  25 #elif defined(__clang__) && defined(_MSC_VER) // Clang-cl (Clang for Windows)
  26
  27 #   define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(               \
  28                     __clang_major__, __clang_minor__, __clang_patchlevel__)
  29
  30 #   if BOOST_HANA_CONFIG_CLANG < BOOST_HANA_CONFIG_VERSION(3, 5, 0)
  31 #       warning "Versions of Clang prior to 3.5.0 are not supported by Hana."
  32 #   endif
  33
  34 #   if _MSC_VER < 1900
  35 #       warning "Clang-cl is only supported with the -fms-compatibility-version parameter set to 19 and above."
  36 #   endif
  37
  38 #elif defined(__clang__) && defined(__apple_build_version__) // Apple's Clang
  39
  40 #   if __apple_build_version__ >= 6020049
  41 #       define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(3, 6, 0)
  42 #   else
  43 #       warning "Versions of Apple's Clang prior to the one shipped with Xcode 6.3 are not supported by Hana."
  44 #   endif
  45
  46 #elif defined(__clang__) // genuine Clang
  47
  48 #   define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(               \
  49                 __clang_major__, __clang_minor__, __clang_patchlevel__)
  50
  51 #   if BOOST_HANA_CONFIG_CLANG < BOOST_HANA_CONFIG_VERSION(3, 5, 0)
  52 #       warning "Versions of Clang prior to 3.5.0 are not supported by Hana."
  53 #   endif
  54
  55 #elif defined(__GNUC__) // GCC
  56
  57 #   define BOOST_HANA_CONFIG_GCC BOOST_HANA_CONFIG_VERSION(                 \
  58                             __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
  59
  60 #   if BOOST_HANA_CONFIG_GCC < BOOST_HANA_CONFIG_VERSION(6, 0, 0)
  61 #       warning "Versions of GCC prior to 6.0.0 are not supported by Hana."
  62 #   endif
  63
  64 #else
  65
  66 #   warning "Your compiler is not officially supported by Hana or it was not detected properly."
  67
  68 #endif
  69
  70 //////////////////////////////////////////////////////////////////////////////
  71 // Check the compiler for general C++14 capabilities
  72 //////////////////////////////////////////////////////////////////////////////
  73 #if (__cplusplus < 201400)
  74 #   if defined(_MSC_VER)
  75 #       pragma message("Warning: Your compiler doesn't provide C++14 or higher capabilities. Try adding the compiler flag '-std=c++14' or '-std=c++1y'.")
  76 #   else
  77 #       warning "Your compiler doesn't provide C++14 or higher capabilities. Try adding the compiler flag '-std=c++14' or '-std=c++1y'."
  78 #   endif
  79 #endif
  80
  81 //////////////////////////////////////////////////////////////////////////////
  82 // Detect the standard library
  83 //////////////////////////////////////////////////////////////////////////////
  84
  85 // We include this header, which normally defines the proper detection macros.
  86 // At least, libc++ and libstdc++ do.
  87 #include <cstddef>
  88
  89 #if defined(_LIBCPP_VERSION)
  90
  91 #   define BOOST_HANA_CONFIG_LIBCPP BOOST_HANA_CONFIG_VERSION(              \
  92                 ((_LIBCPP_VERSION) / 1000) % 10, 0, (_LIBCPP_VERSION) % 1000)
  93
  94 #   if BOOST_HANA_CONFIG_LIBCPP < BOOST_HANA_CONFIG_VERSION(1, 0, 101)
  95 #       warning "Versions of libc++ prior to the one shipped with Clang 3.5.0 are not supported by Hana."
  96 #   endif
  97
  98 #elif defined(__GLIBCXX__)
  99
 100 // We do not define a macro to keep track of libstdc++'s version, because
 101 // we have no scalable way of associating a value of __GLIBCXX__ to the
 102 // corresponding GCC release. Instead, we just check that the release date
 103 // of the libstdc++ in use is recent enough, which should indicate that it
 104 // was released with a GCC >= 5.1, which in turn indicates good enough C++14
 105 // support.
 106 #   if __GLIBCXX__ < 20150422 // --> the libstdc++ shipped with GCC 5.1.0
 107 #       warning "Versions of libstdc++ prior to the one shipped with GCC 5.1.0 are not supported by Hana for lack of full C++14 support."
 108 #   endif
 109
 110 #   define BOOST_HANA_CONFIG_LIBSTDCXX
 111
 112 #elif defined(_MSC_VER)
 113
 114 #   define BOOST_HANA_CONFIG_LIBMSVCCXX
 115
 116 #else
 117
 118 #   warning "Your standard library is not officially supported by Hana or it was not detected properly."
 119
 120 #endif
 121
 122
 123 //////////////////////////////////////////////////////////////////////////////
 124 // Caveats and other compiler-dependent options
 125 //////////////////////////////////////////////////////////////////////////////
 126
 127 // `BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA` enables some constructs requiring
 128 // `constexpr` lambdas, which are in the language starting with C++17.
 129 //
 130 // Always disabled for now because Clang only has partial support for them
 131 // (captureless lambdas only).
 132 #if defined(__cplusplus) && __cplusplus > 201402L
 133 #   define BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA constexpr
 134 // #   define BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA
 135 #else
 136 #   define BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA /* nothing */
 137 #endif
 138
 139 // `BOOST_HANA_CONSTEXPR_LAMBDA` expands to `constexpr` if constexpr lambdas
 140 // are supported and to nothing otherwise.
 141 #if defined(BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA)
 142 #   define BOOST_HANA_CONSTEXPR_LAMBDA constexpr
 143 #else
 144 #   define BOOST_HANA_CONSTEXPR_LAMBDA /* nothing */
 145 #endif
 146
 147 // The std::tuple adapter is broken on libc++ prior to the one shipped
 148 // with Clang 3.7.0.
 149 #if defined(BOOST_HANA_CONFIG_LIBCPP) &&                                    \
 150         BOOST_HANA_CONFIG_LIBCPP < BOOST_HANA_CONFIG_VERSION(1, 0, 101)
 151 #   define BOOST_HANA_CONFIG_HAS_NO_STD_TUPLE_ADAPTER
 152 #endif
 153
 154 // There's a bug in std::tuple_cat in libc++ right now.
 155 // See http://llvm.org/bugs/show_bug.cgi?id=22806.
 156 #if defined(BOOST_HANA_CONFIG_LIBCPP)
 157 #   define BOOST_HANA_CONFIG_LIBCPP_HAS_BUG_22806
 158 #endif
 159
 160 //////////////////////////////////////////////////////////////////////////////
 161 // Namespace macros
 162 //////////////////////////////////////////////////////////////////////////////
 163 #define BOOST_HANA_NAMESPACE_BEGIN namespace boost { namespace hana {
 164
 165 #define BOOST_HANA_NAMESPACE_END }}
 166
 167 //////////////////////////////////////////////////////////////////////////////
 168 // Library features and options that can be tweaked by users
 169 //////////////////////////////////////////////////////////////////////////////
 170
 171 #if defined(BOOST_HANA_DOXYGEN_INVOKED) || \
 172     (defined(NDEBUG) && !defined(BOOST_HANA_CONFIG_DISABLE_ASSERTIONS))
 173     //! @ingroup group-config
 174     //! Disables the `BOOST_HANA_*_ASSERT` macro & friends.
 175     //!
 176     //! When this macro is defined, the `BOOST_HANA_*_ASSERT` macro & friends
 177     //! are disabled, i.e. they expand to nothing.
 178     //!
 179     //! This macro is defined automatically when `NDEBUG` is defined. It can
 180     //! also be defined by users before including this header or defined on
 181     //! the command line.
 182 #   define BOOST_HANA_CONFIG_DISABLE_ASSERTIONS
 183 #endif
 184
 185 #if defined(BOOST_HANA_DOXYGEN_INVOKED)
 186     //! @ingroup group-config
 187     //! Disables concept checks in interface methods.
 188     //!
 189     //! When this macro is not defined (the default), tag-dispatched methods
 190     //! will make sure the arguments they are passed are models of the proper
 191     //! concept(s). This can be very helpful in catching programming errors,
 192     //! but it is also slightly less compile-time efficient. You should
 193     //! probably always leave the checks enabled (and hence never define this
 194     //! macro), except perhaps in translation units that are compiled very
 195     //! often but whose code using Hana is modified very rarely.
 196 #   define BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
 197 #endif
 198
 199 #if defined(BOOST_HANA_DOXYGEN_INVOKED)
 200     //! @ingroup group-config
 201     //! Enables usage of the "string literal operator template" GNU extension.
 202     //!
 203     //! That operator is not part of the language yet, but it is supported by
 204     //! both Clang and GCC. This operator allows Hana to provide the nice `_s`
 205     //! user-defined literal for creating compile-time strings.
 206     //!
 207     //! When this macro is not defined, the GNU extension will be not used
 208     //! by Hana. Because this is a non-standard extension, the macro is not
 209     //! defined by default.
 210 #   define BOOST_HANA_CONFIG_ENABLE_STRING_UDL
 211 #endif
 212
 213 #if defined(BOOST_HANA_DOXYGEN_INVOKED)
 214     //! @ingroup group-config
 215     //! Enables additional assertions and sanity checks to be done by Hana.
 216     //!
 217     //! When this macro is defined (it is __not defined__ by default),
 218     //! additional sanity checks may be done by Hana. These checks may
 219     //! be costly to perform, either in terms of compilation time or in
 220     //! terms of execution time. These checks may help debugging an
 221     //! application during its initial development, but they should not
 222     //! be enabled as part of the normal configuration.
 223 #   define BOOST_HANA_CONFIG_ENABLE_DEBUG_MODE
 224 #endif
 225
 226 #endif // !BOOST_HANA_CONFIG_HPP