libstdc++-v3/include/bits/c++config

   1 // Predefined symbols and macros -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   4 // 2006, 2007 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 /** @file c++config.h
  32  *  This is an internal header file, included by other library headers.
  33  *  You should not attempt to use it directly.
  34  */
  35
  36 #ifndef _GLIBCXX_CXX_CONFIG_H
  37 #define _GLIBCXX_CXX_CONFIG_H 1
  38
  39 // Pick up any OS-specific definitions.
  40 #include <bits/os_defines.h>
  41
  42 // Pick up any CPU-specific definitions.
  43 #include <bits/cpu_defines.h>
  44
  45 // The current version of the C++ library in compressed ISO date format.
  46 #define __GLIBCXX__
  47
  48 // Macros for visibility.
  49 #define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
  50
  51 #if _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
  52 #define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
  53 #else
  54 #define _GLIBCXX_VISIBILITY(V)
  55 #endif
  56
  57 // Macros for controlling various namespace association schemes and modes.
  58 #ifdef _GLIBCXX_DEBUG
  59 # define _GLIBCXX_NAMESPACE_ASSOCIATION_DEBUG 1
  60 #endif
  61
  62 #define _GLIBCXX_NAMESPACE_ASSOCIATION_VERSION
  63
  64 // Macros for namespace scope.
  65 // _GLIBCXX_BEGIN_NAMESPACE
  66 // _GLIBCXX_END_NAMESPACE
  67 // _GLIBCXX_BEGIN_NESTED_NAMESPACE
  68 // _GLIBCXX_END_NESTED_NAMESPACE
  69 #if _GLIBCXX_NAMESPACE_ASSOCIATION_VERSION
  70 # define _GLIBCXX_BEGIN_NESTED_NAMESPACE(X, Y)  namespace X { namespace Y _GLIBCXX_VISIBILITY(default) {
  71 # define _GLIBCXX_END_NESTED_NAMESPACE } }
  72 # define _GLIBCXX_BEGIN_NAMESPACE(X) _GLIBCXX_BEGIN_NESTED_NAMESPACE(X, _6)
  73 # define _GLIBCXX_END_NAMESPACE _GLIBCXX_END_NESTED_NAMESPACE
  74 #else
  75 # define _GLIBCXX_BEGIN_NAMESPACE(X) namespace X _GLIBCXX_VISIBILITY(default) {
  76 # define _GLIBCXX_END_NAMESPACE }
  77 # if _GLIBCXX_NAMESPACE_ASSOCIATION_DEBUG
  78 #  define _GLIBCXX_BEGIN_NESTED_NAMESPACE(X, Y) namespace X { namespace Y _GLIBCXX_VISIBILITY(default) {
  79 #  define _GLIBCXX_END_NESTED_NAMESPACE  } }
  80 # else
  81 #  define _GLIBCXX_BEGIN_NESTED_NAMESPACE(X, Y) _GLIBCXX_BEGIN_NAMESPACE(X)
  82 #  define _GLIBCXX_END_NESTED_NAMESPACE _GLIBCXX_END_NAMESPACE
  83 # endif
  84 #endif
  85
  86 // Namespace associations for versioning mode.
  87 #if _GLIBCXX_NAMESPACE_ASSOCIATION_VERSION
  88 namespace std
  89 {
  90   namespace _6 { }
  91   using namespace _6 __attribute__ ((strong));
  92 }
  93
  94 // In addition, other supported namespace configurations.
  95 namespace __gnu_cxx
  96 {
  97   namespace _6 { }
  98   using namespace _6 __attribute__ ((strong));
  99 }
 100
 101 namespace std
 102 {
 103   namespace tr1
 104   {
 105     namespace _6 { }
 106     using namespace _6 __attribute__ ((strong));
 107   }
 108 }
 109 #endif
 110
 111 // Namespace associations for debug mode.
 112 #if _GLIBCXX_NAMESPACE_ASSOCIATION_DEBUG
 113 namespace std
 114 {
 115   namespace __norm { }
 116   namespace __debug { }
 117   using namespace __debug __attribute__ ((strong));
 118 }
 119
 120 namespace __gnu_cxx
 121 {
 122   namespace __norm { }
 123   namespace __debug { }
 124   using namespace __debug __attribute__ ((strong));
 125 }
 126
 127 # define _GLIBCXX_STD __norm
 128 # define _GLIBCXX_EXT __norm
 129 # define _GLIBCXX_EXTERN_TEMPLATE 0
 130 # if __NO_INLINE__ && !__GXX_WEAK__
 131 #  warning debug mode without inlining may fail due to lack of weak symbols
 132 # endif
 133 #else
 134 #if _GLIBCXX_NAMESPACE_ASSOCIATION_VERSION
 135 # define _GLIBCXX_STD _6
 136 # define _GLIBCXX_EXT _6
 137 #else
 138 # define _GLIBCXX_STD std
 139 # define _GLIBCXX_EXT __gnu_cxx
 140 #endif
 141 #endif
 142
 143 /* Define if compatibility should be provided for -mlong-double-64. */
 144 #undef _GLIBCXX_LONG_DOUBLE_COMPAT
 145
 146 // XXX GLIBCXX_ABI Deprecated
 147 // Namespace associations for long double 128 mode.
 148 _GLIBCXX_BEGIN_NAMESPACE(std)
 149 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
 150 # define _GLIBCXX_LDBL_NAMESPACE __gnu_cxx_ldbl128::
 151 # define _GLIBCXX_BEGIN_LDBL_NAMESPACE namespace __gnu_cxx_ldbl128 {
 152 # define _GLIBCXX_END_LDBL_NAMESPACE }
 153   namespace __gnu_cxx_ldbl128 { }
 154   using namespace __gnu_cxx_ldbl128 __attribute__((__strong__));
 155 #else
 156 # define _GLIBCXX_LDBL_NAMESPACE
 157 # define _GLIBCXX_BEGIN_LDBL_NAMESPACE
 158 # define _GLIBCXX_END_LDBL_NAMESPACE
 159 #endif
 160 _GLIBCXX_END_NAMESPACE
 161
 162
 163 // Allow use of "export template." This is currently not a feature
 164 // that g++ supports.
 165 // #define _GLIBCXX_EXPORT_TEMPLATE 1
 166
 167 // Allow use of the GNU syntax extension, "extern template." This
 168 // extension is fully documented in the g++ manual, but in a nutshell,
 169 // it inhibits all implicit instantiations and is used throughout the
 170 // library to avoid multiple weak definitions for required types that
 171 // are already explicitly instantiated in the library binary. This
 172 // substantially reduces the binary size of resulting executables.
 173 #ifndef _GLIBCXX_EXTERN_TEMPLATE
 174 # define _GLIBCXX_EXTERN_TEMPLATE 1
 175 #endif
 176
 177
 178 // Certain function definitions that are meant to be overridable from
 179 // user code are decorated with this macro.  For some targets, this
 180 // macro causes these definitions to be weak.
 181 #ifndef _GLIBCXX_WEAK_DEFINITION
 182 # define _GLIBCXX_WEAK_DEFINITION
 183 #endif
 184
 185 // The remainder of the prewritten config is automatic; all the
 186 // user hooks are listed above.
 187
 188 // Create a boolean flag to be used to determine if --fast-math is set.
 189 #ifdef __FAST_MATH__
 190 # define _GLIBCXX_FAST_MATH 1
 191 #else
 192 # define _GLIBCXX_FAST_MATH 0
 193 #endif
 194
 195 // This marks string literals in header files to be extracted for eventual
 196 // translation.  It is primarily used for messages in thrown exceptions; see
 197 // src/functexcept.cc.  We use __N because the more traditional _N is used
 198 // for something else under certain OSes (see BADNAMES).
 199 #define __N(msgid)     (msgid)
 200
 201 // For example, <windows.h> is known to #define min and max as macros...
 202 #undef min
 203 #undef max
 204
 205 // End of prewritten config; the discovered settings follow.