[Bug libstdc++/50982] AIX libstdc++ GTHREADS incompatibility

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50982

--- Comment #40 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-07 07:34:05 UTC ---
I've tracked this behaviour down to cp_parser_parameter_declaration_clause in
cp/parser.c which has a special case for 

  else if (token->type == CPP_CLOSE_PAREN)
    /* There are no parameters.  */
    {
#ifndef NO_IMPLICIT_EXTERN_C
      if (in_system_header && current_class_type == NULL
          && current_lang_name == lang_name_c)
        return NULL_TREE;
      else
#endif
        return void_list_node;
    }


That macro is defined on platforms that are not known to have C++-compatible
system headers