gold/system.h

   1 // system.h -- general definitions for gold   -*- C++ -*-
   2
   3 // Copyright (C) 2006-2020 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 #ifdef ENABLE_NLS
  37 // On some systems, things go awry when <libintl.h> comes after <clocale>.
  38 # include <libintl.h>
  39 # include <clocale>
  40 # define _(String) gettext (String)
  41 # ifdef gettext_noop
  42 #  define N_(String) gettext_noop (String)
  43 # else
  44 #  define N_(String) (String)
  45 # endif
  46 #else
  47 // Include <clocale> first to avoid conflicts with these macros.
  48 # include <clocale>
  49 # define gettext(Msgid) (Msgid)
  50 # define dgettext(Domainname, Msgid) (Msgid)
  51 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  52 # define ngettext(Msgid1, Msgid2, n) \
  53   (n == 1 ? Msgid1 : Msgid2)
  54 # define dngettext(Domainname, Msgid1, Msgid2, n) \
  55   (n == 1 ? Msgid1 : Msgid2)
  56 # define dcngettext(Domainname, Msgid1, Msgid2, n, Category) \
  57   (n == 1 ? Msgid1 : Msgid2)
  58 # define textdomain(Domainname) do {} while (0)
  59 # define bindtextdomain(Domainname, Dirname) do {} while (0)
  60 # define _(String) (String)
  61 # define N_(String) (String)
  62 #endif
  63
  64 // Figure out how to get a hash set and a hash map.
  65
  66 #if defined(HAVE_UNORDERED_SET) && defined(HAVE_UNORDERED_MAP)
  67
  68 #include <unordered_set>
  69 #include <unordered_map>
  70
  71 // We need a template typedef here.
  72
  73 #define Unordered_set std::unordered_set
  74 #define Unordered_map std::unordered_map
  75 #define Unordered_multimap std::unordered_multimap
  76
  77 #define reserve_unordered_map(map, n) ((map)->rehash(n))
  78
  79 #elif defined(HAVE_TR1_UNORDERED_SET) && defined(HAVE_TR1_UNORDERED_MAP) \
  80       && defined(HAVE_TR1_UNORDERED_MAP_REHASH)
  81
  82 #include <tr1/unordered_set>
  83 #include <tr1/unordered_map>
  84
  85 // We need a template typedef here.
  86
  87 #define Unordered_set std::tr1::unordered_set
  88 #define Unordered_map std::tr1::unordered_map
  89 #define Unordered_multimap std::tr1::unordered_multimap
  90
  91 #define reserve_unordered_map(map, n) ((map)->rehash(n))
  92
  93 #ifndef HAVE_TR1_HASH_OFF_T
  94 // The library does not support hashes of off_t values.  Add support
  95 // here.  This is likely to be specific to libstdc++.  This issue
  96 // arises with GCC 4.1.x when compiling in 32-bit mode with a 64-bit
  97 // off_t type.
  98 namespace std { namespace tr1 {
  99 template<>
 100 struct hash<off_t> : public std::unary_function<off_t, std::size_t>
 101 {
 102   std::size_t
 103   operator()(off_t val) const
 104   { return static_cast<std::size_t>(val); }
 105 };
 106 } } // Close namespaces.
 107 #endif // !defined(HAVE_TR1_HASH_OFF_T)
 108
 109 #elif defined(HAVE_EXT_HASH_MAP) && defined(HAVE_EXT_HASH_SET)
 110
 111 #include <ext/hash_map>
 112 #include <ext/hash_set>
 113 #include <string>
 114
 115 #define Unordered_set __gnu_cxx::hash_set
 116 #define Unordered_map __gnu_cxx::hash_map
 117 #define Unordered_multimap __gnu_cxx::hash_multimap
 118
 119 namespace __gnu_cxx
 120 {
 121
 122 template<>
 123 struct hash<std::string>
 124 {
 125   size_t
 126   operator()(std::string s) const
 127   { return __stl_hash_string(s.c_str()); }
 128 };
 129
 130 template<typename T>
 131 struct hash<T*>
 132 {
 133   size_t
 134   operator()(T* p) const
 135   { return reinterpret_cast<size_t>(p); }
 136 };
 137
 138 }
 139
 140 #define reserve_unordered_map(map, n) ((map)->resize(n))
 141
 142 #else
 143
 144 // The fallback is to just use set and map.
 145
 146 #include <set>
 147 #include <map>
 148
 149 #define Unordered_set std::set
 150 #define Unordered_map std::map
 151 #define Unordered_multimap std::multimap
 152
 153 #define reserve_unordered_map(map, n)
 154
 155 #endif
 156
 157 #ifndef HAVE_PREAD
 158 extern "C" ssize_t pread(int, void*, size_t, off_t);
 159 #endif
 160
 161 #ifndef HAVE_FTRUNCATE
 162 extern "C" int ftruncate(int, off_t);
 163 #endif
 164
 165 #ifndef HAVE_FFSLL
 166 extern "C" int ffsll(long long);
 167 #endif
 168
 169 #if !HAVE_DECL_MEMMEM
 170 extern "C" void *memmem(const void *, size_t, const void *, size_t);
 171 #endif
 172
 173 #if !HAVE_DECL_STRNDUP
 174 extern "C" char *strndup(const char *, size_t);
 175 #endif
 176
 177 #endif // !defined(SYSTEM_H)