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From: "telans at posteo dot de" <sourceware-bugzilla@sourceware.org>
To: debugedit@sourceware.org
Subject: [Bug debugedit/28728] Unknown DWARF DW_FORM_0x25 (DW_FORM_strx)
Date: Fri, 18 Feb 2022 07:41:05 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28728

James Beddek <telans at posteo dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |telans at posteo dot de

--- Comment #3 from James Beddek <telans at posteo dot de> ---
(In reply to Mark Wielaard from comment #2)
> (In reply to Vitaly Chikunov from comment #0)
> > When building Linux kernel with[1] CC=3Dclang LLVM=3D1 and
> > CONFIG_DEBUG_INFO_DWARF5=3Dy debugedit reports error when processing co=
mpiled
> > kernel modules, such as
> >=20
> >   debugedit:
> > ./lib/modules/5.16.0+rc6.20211223-drm-tip-alt1/kernel/sound/usb/caiaq/s=
nd-
> > usb-caiaq.ko: Unknown DWARF DW_FORM_0x25
>=20
> That is DW_FORM_strx1, which is only partially supported by debugedit.
> Normally the DW_FORM_strx forms are only used when generating split DWARF
> (.dwo) files. Best workaround for now is to not use DWARF5 with llvm (whi=
ch
> isn't the default for clang/llvm anyway).

DWARFv5 is now the default with the upcoming Clang 14.0.0 release:
https://github.com/llvm/llvm-project/blob/e80c52986e1bb3afa6a92c58b1cb89787=
7923a66/clang/docs/ReleaseNotes.rst#dwarf-support-in-clang

At the moment debugedit warns for almost any binary compiled with Clang
14.0.0-rc1

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