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From: "mliska at suse dot cz" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/26987] GCC 11 Ada binaries contain unknown tags
Date: Wed, 02 Dec 2020 12:29:14 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26987

--- Comment #6 from Martin Liska <mliska at suse dot cz> ---
(In reply to Mark Wielaard from comment #5)
> My local build of binutils readelf doesn't show this issue. Might it be
> https://sourceware.org/bugzilla/show_bug.cgi?id=3D26548 (which should be =
part
> of 2.35.1, but was a bug in 2.35)

It's actually the following commit:

commit ef5e3e92dc7234f64e77e8c8af5d61685d96263b
Author: Nick Clifton <nickc@redhat.com>
Date:   Tue Oct 27 16:17:13 2020 +0000

    Fix the decoding of DW_FORM_ref_addr DWARF attribute.

            * dwarf.c (struct abbrev_list): New structure.  Used to collect
            lists of abbreviation sets.
            (struct abbrev_map): New structure.  Used to map CU offsets to
            abbreviation offsets.
            (record_abbrev_list): New function.  A new entry to an
            abbreviation list.
            (free_all_abbrevs): Update to free abbreviation lists.
            (new_abbrev_list): New function.  Start a new abbreviation
            list.
            (find_abbrev_list_by_abbrev_offset): New function.
            (find_abbrev_map_by_offset): New function.
            (add_abbrev): Add abbrev_list parameter.
            (add_abbrev_attr): Likewise.
            (process_abbrev_section): Rename to process_abbrev_set and add
            list parameter.
            (get_type_abbrev_from_form): New function.  Attempts to decode =
the
            forms used by DW_AT_type attributes.
            (get_type_signedness): Display type names if operating in wide
            mode.  Use get_type_abbrev_from_form.
            (read_and_display_attr_value): Use get_type_abbrev_from_form.
            (process_debug_info): Pre-parse the CU headers to collate all t=
he
            abbrevs before starting the main scan.
            (process_debug_abbrev): Do not free any loaded abbrevs.
            (free_debug_memory): Free the abbrev maps.

    (cherry picked from commit bcd213b2cfbca2df53fb7e5d187fd67ea8eb7185)

The commit was installed after 2.35.1 was released.

>=20
> Also dwz gnatmake doesn't show any issues.
> So I assume it is an issue when doing dwz -m ?

Yes, I'll attach you a file from gcc11 package build that suffers from that.

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