[PATCH] C++/DWARF : Add 'using' support

[Devang Patel <dpatel at apple dot com>]

This patch adds using directive and using decls support
in dwarf2out.c (and namespace alias).

More information about this patch is in this msg:
http://gcc.gnu.org/ml/gcc/2003-12/msg00336.html

Bootstrapped and tested on i686-pc-linux-gnu.

GDB test run does not reveal any new regression.
(I used David Carlton's carlton_dictionary-branch for GDB testing).

I also hand coded few examples and analyzed dwarf output.

OK for mainline ?
--
Devang

2003-12-11  Devang Patel  <dpatel@apple.com>

        * dbxout.c (dbx_debug_hooks): Add new empty hook for
        imported_module_or_decl.
        (xcoff_debug_hooks): Same.
        * debug.c (do_nothing_debug_hooks): Same.
        * dwarfout.c (dwarf_debug_hooks): Same.
        * sdbout.c (sdb_debug_hooks): Same.
        * vmsdbgout.c (vmsdbg_debug_hooks): Same.
        (debug_nothing_tree_tree_int): New function.
        * debug.h (gcc_debug_hooks): New hook, imported_module_or_decl.
        (dbg_module_or_decl): New enum.
        * dwarf2out.c: Include input.h.
        (dwarf2_debug_hooks): Add new hook for imported_module_or_decl.
        (dwarf_tag_name): Handle DW_TAG_imported_module.
        (gen_decl_die): Output DIE to represent the function itself iff
        we are emiting primary DIE for the decl. Setup namespace context
        for VAR_DECL.
        (dwarf2out_imported_module_or_decl): New function.
        (dwarf2out_decl): Add DECL_CONTEXT check for FUNCTION_DECL.
        (force_namespace_die): Replace it with ...
        (force_decl_die): ... this.
        (force_type_die): New function.
        (setup_namespace_context): Replace use of force_namespace_die() 
with
        force_decl_die().
        (gen_namespace_die): Same.
        * Makefile.in (dwarf2out.o): Depend on input.h

        cp:

        * name-lookup.c: Include "debug.h"
        (do_namespace_alias): Invoke debug_hooks to emit debug info
        for namespace alias.
        * parser.c: Include "debug.h"
        (cp_emit_debug_info_for_using): New function.
        (cp_parser_using_declaration): Emit debug info for using decl.
        (cp_parser_using_directive): Invoke debug_hooks to emit debug
        info for using directive.
        * Make-lang.in (cp/parser.o): Depend on debug.h
        (cp/name-lookup.o): Same.

        testsuite:

        g++.dg/debug/namespace1.C: New test.

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