gold/system.h

   1 // system.h -- general definitions for gold   -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #ifndef SYSTEM_H
  24 #define SYSTEM_H 1
  25
  26 #ifndef ENABLE_NLS
  27   // The Solaris version of locale.h always includes libintl.h.  If we
  28   // have been configured with --disable-nls then ENABLE_NLS will not
  29   // be defined and the dummy definitions of bindtextdomain (et al)
  30   // below will conflict with the definitions in libintl.h.  So we
  31   // define these values to prevent the bogus inclusion of libintl.h.
  32 # define _LIBINTL_H
  33 # define _LIBGETTEXT_H
  34 #endif
  35
  36 // Always include <clocale> first to avoid conflicts with the macros
  37 // used when ENABLE_NLS is not defined.
  38 #include <clocale>
  39
  40 #ifdef ENABLE_NLS
  41 # include <libintl.h>
  42 # define _(String) gettext (String)
  43 # ifdef gettext_noop
  44 #  define N_(String) gettext_noop (String)
  45 # else
  46 #  define N_(String) (String)
  47 # endif
  48 #else
  49 # define gettext(Msgid) (Msgid)
  50 # define dgettext(Domainname, Msgid) (Msgid)
  51 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  52 # define textdomain(Domainname) do {} while (0) /* nothing */
  53 # define bindtextdomain(Domainname, Dirname) do {} while (0) /* nothing */
  54 # define _(String) (String)
  55 # define N_(String) (String)
  56 #endif
  57
  58 // Figure out how to get a hash set and a hash map.
  59
  60 #if defined(HAVE_TR1_UNORDERED_SET) && defined(HAVE_TR1_UNORDERED_MAP) \
  61     && defined(HAVE_TR1_UNORDERED_MAP_REHASH)
  62
  63 #include <tr1/unordered_set>
  64 #include <tr1/unordered_map>
  65
  66 // We need a template typedef here.
  67
  68 #define Unordered_set std::tr1::unordered_set
  69 #define Unordered_map std::tr1::unordered_map
  70 #define Unordered_multimap std::tr1::unordered_multimap
  71
  72 #define reserve_unordered_map(map, n) ((map)->rehash(n))
  73
  74 #ifndef HAVE_TR1_HASH_OFF_T
  75 // The library does not support hashes of off_t values.  Add support
  76 // here.  This is likely to be specific to libstdc++.  This issue
  77 // arises with GCC 4.1.x when compiling in 32-bit mode with a 64-bit
  78 // off_t type.
  79 namespace std { namespace tr1 {
  80 template<>
  81 struct hash<off_t> : public std::unary_function<off_t, std::size_t>
  82 {
  83   std::size_t
  84   operator()(off_t val) const
  85   { return static_cast<std::size_t>(val); }
  86 };
  87 } } // Close namespaces.
  88 #endif // !defined(HAVE_TR1_HASH_OFF_T)
  89
  90 #elif defined(HAVE_EXT_HASH_MAP) && defined(HAVE_EXT_HASH_SET)
  91
  92 #include <ext/hash_map>
  93 #include <ext/hash_set>
  94 #include <string>
  95
  96 #define Unordered_set __gnu_cxx::hash_set
  97 #define Unordered_map __gnu_cxx::hash_map
  98 #define Unordered_multimap __gnu_cxx::hash_multimap
  99
 100 namespace __gnu_cxx
 101 {
 102
 103 template<>
 104 struct hash<std::string>
 105 {
 106   size_t
 107   operator()(std::string s) const
 108   { return __stl_hash_string(s.c_str()); }
 109 };
 110
 111 template<typename T>
 112 struct hash<T*>
 113 {
 114   size_t
 115   operator()(T* p) const
 116   { return reinterpret_cast<size_t>(p); }
 117 };
 118
 119 }
 120
 121 #define reserve_unordered_map(map, n) ((map)->resize(n))
 122
 123 #else
 124
 125 // The fallback is to just use set and map.
 126
 127 #include <set>
 128 #include <map>
 129
 130 #define Unordered_set std::set
 131 #define Unordered_map std::map
 132 #define Unordered_multimap std::multimap
 133
 134 #define reserve_unordered_map(map, n)
 135
 136 #endif
 137
 138 #ifndef HAVE_PREAD
 139 extern "C" ssize_t pread(int, void*, size_t, off_t);
 140 #endif
 141
 142 #ifndef HAVE_FTRUNCATE
 143 extern "C" int ftruncate(int, off_t);
 144 #endif
 145
 146 #ifndef HAVE_FFSLL
 147 extern "C" int ffsll(long long);
 148 #endif
 149
 150 #if !HAVE_DECL_MEMMEM
 151 extern "C" void *memmem(const void *, size_t, const void *, size_t);
 152 #endif
 153
 154 #if !HAVE_DECL_STRNDUP
 155 extern "C" char *strndup(const char *, size_t);
 156 #endif
 157
 158 #endif // !defined(SYSTEM_H)