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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/30829] [gdb/symtab] Review write_gdbindex for dwz
Date: Tue, 12 Sep 2023 10:01:19 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30829

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #3)
> There seems to be some undocumented behaviour going on (at least, I don't
> see any explicit mention of the following here:
> https://sourceware.org/gdb/onlinedocs/gdb/Index-Section-Format.html#Index-
> Section-Format ).
>=20
> Indeed each .gdb_index section has a CU/TU table, and the section for the
> .gnu_debugaltlink file contains nothing else.
>=20
> I think the assumption was that a .gnu_debugaltlink contains only PUs, and
> that the toplevel symbol table only contains references to CUs/TUs, which
> will be pointing to the toplevel CU/TU table.
>=20
> However, in this test-case the .gnu_debugaltlink file contains a CU.
>=20
> And the reference in the toplevel symbol table point towards it, in the
> sense that the virtual toplevel CU/TU table (otherwise known as all_units)
> first contains the toplevel CU/PUs, then toplevel TUs, then
> .gnu_debugaltlink CU/PUs

I've submitted a doc patch:
https://sourceware.org/pipermail/gdb-patches/2023-September/202359.html

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