[Bug debug/83941] Debug info generated with -flto contains useless forwarders

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83941

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Sep 25 07:30:56 2018
New Revision: 264564

URL: https://gcc.gnu.org/viewcvs?rev=264564&root=gcc&view=rev
Log:
2018-09-25  Richard Biener  <rguenther@suse.de>

        PR debug/83941
        * dwarf2out.c (struct sym_off_pair): New.
        (external_die_map): New global.
        (lookup_decl_die): When in LTO create DIEs lazily from the
        external_die_map.
        (lookup_block_die): New function, create DIEs lazily in LTO.
        (equate_block_to_die): New function.
        (dwarf2out_die_ref_for_decl): During WPA get the association
        from the external DIE map.
        (dwarf2out_register_external_die): Record mapping into the
        external DIE map.
        (maybe_create_die_with_external_ref): New function split out from
        DIE generation part of old dwarf2out_register_external_die.
        (add_abstract_origin_attribute): Do not return the DIE.  When
        in LTO reference externals directly.
        (dwarf2out_abstract_function): When in LTO ignore calls for
        decls with external DIEs (already present abstract instances).
        (gen_call_site_die): Adjust.
        (add_high_low_attributes): Likewise.
        (gen_lexical_block_die): Likewise.
        (gen_inlined_subroutine_die): Likewie.
        (gen_block_die): Likewise.
        (dwarf2out_inline_entry): Likewise.
        (dwarf2out_early_finish): In LTRANS phase create DW_TAG_imported_unit
        DIEs.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c