1 /* C++ specific Solaris system support.
2    Copyright (C) 2011-2018 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
solaris_cxx_decl_mangling_context(const_tree decl)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 }
63