gcc/config/sol2-cxx.cc

   1 /* C++ specific Solaris system support.
   2    Copyright (C) 2011-2024 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 #define INCLUDE_MEMORY
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "cp/cp-tree.h"
  25 #include "stringpool.h"
  26
  27 /* Before GCC 4.7, g++ defined __cplusplus 1 to avoid coping with the C++98
  28    overloads in Solaris system headers.  Since this was fixed, 4 structure
  29    types would move to namespace std, breaking the Solaris libstdc++ ABI.
  30    To avoid this, we forcefully keep those types in the global namespace.
  31    This can be removed once the next major version of libstdc++ is
  32    released.  */
  33
  34 /* Cache the identifiers of the affected types to speed up lookup.  */
  35 #define NUM_FGID 4
  36 static GTY(()) tree force_global_identifiers[NUM_FGID];
  37
  38 /* Check if DECL is one of the affected types and move it to the global
  39    namespace if so.  */
  40 tree
  41 solaris_cxx_decl_mangling_context (const_tree decl)
  42 {
  43   static bool init = false;
  44   int i = 0;
  45
  46   if (!init)
  47     {
  48       force_global_identifiers[i++] = get_identifier ("div_t");
  49       force_global_identifiers[i++] = get_identifier ("ldiv_t");
  50       force_global_identifiers[i++] = get_identifier ("lconv");
  51       force_global_identifiers[i++] = get_identifier ("tm");
  52       init = true;
  53     }
  54
  55   if (!(DECL_P (decl) && DECL_NAMESPACE_STD_P (CP_DECL_CONTEXT (decl))))
  56     return NULL_TREE;
  57
  58   for (i = 0; i < NUM_FGID; i++)
  59     if (DECL_NAME (decl) == force_global_identifiers[i])
  60         return global_namespace;
  61
  62   return NULL_TREE;
  63 }