gcc/config/sol2-cxx.cc

   1 /* C++ specific Solaris system support.
   2    Copyright (C) 2011-2023 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "cp/cp-tree.h"
  24 #include "stringpool.h"
  25
  26 /* Before GCC 4.7, g++ defined __cplusplus 1 to avoid coping with the C++98
  27    overloads in Solaris system headers.  Since this was fixed, 4 structure
  28    types would move to namespace std, breaking the Solaris libstdc++ ABI.
  29    To avoid this, we forcefully keep those types in the global namespace.
  30    This can be removed once the next major version of libstdc++ is
  31    released.  */
  32
  33 /* Cache the identifiers of the affected types to speed up lookup.  */
  34 #define NUM_FGID 4
  35 static GTY(()) tree force_global_identifiers[NUM_FGID];
  36
  37 /* Check if DECL is one of the affected types and move it to the global
  38    namespace if so.  */
  39 tree
  40 solaris_cxx_decl_mangling_context (const_tree decl)
  41 {
  42   static bool init = false;
  43   int i = 0;
  44
  45   if (!init)
  46     {
  47       force_global_identifiers[i++] = get_identifier ("div_t");
  48       force_global_identifiers[i++] = get_identifier ("ldiv_t");
  49       force_global_identifiers[i++] = get_identifier ("lconv");
  50       force_global_identifiers[i++] = get_identifier ("tm");
  51       init = true;
  52     }
  53
  54   if (!(DECL_P (decl) && DECL_NAMESPACE_STD_P (CP_DECL_CONTEXT (decl))))
  55     return NULL_TREE;
  56
  57   for (i = 0; i < NUM_FGID; i++)
  58     if (DECL_NAME (decl) == force_global_identifiers[i])
  59         return global_namespace;
  60
  61   return NULL_TREE;
  62 }