Your message dated Sun, 10 Aug 2025 10:07:08 +0000
with message-id <[email protected]>
and subject line Bug#1016563: fixed in debhelper 13.25
has caused the Debian Bug report #1016563,
regarding debhelper: Should dh_dwz be dropped?
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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1016563: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1016563
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: debhelper
Version: 13.8
Severity: serious
X-Debbugs-Cc: [email protected]
[ debian-devel is in Cc for getting further input. ]
dh_dwz is part of the standard sequence in dh since debhelper compat 12.
dwz offers small optimizations of debug info, the typical benefit
seems to be ~ 3% size reduction.
These optimizations are only in the -dbgsym packages that nearly
noone installs and nearly noone uses.
Debug info is super useful when needed, but it is not installed by
default and dwz optimizations have little practical relevance in the
cases when it is used.
OTOH, the cases where dh_dwz has created additional work for maintainers
are many.[1]
dwz is processing debug info from several producers on many architectures,
and this sometimes breaks in various ways.
On arm64, gcc in stable sometime produces debug info that dwz in
stable cannot handle.[2]
C++ code can result in huge debuginfo, resulting in dwz exhausting
the address space on 32bit architectures, requiring workarounds from
maintainers.[3]
clang 14 which is now default in instable defaults to DWARF 5,
and dwz in unstable has some problems with that.[4,5]
Scroll through [1] for more workarounds for problems in dwz.
The track record of such bugs in dwz getting fixed swiftly is not good.
This is a real problem if dwz is a core toolchain tool most packages
are using by default, and usually maintainers are forced to use
override_dh_dwz whenever dwz chokes on what it is supposed to process.
IMHO the small benefits of dh_dwz are not worth the constant extra work
it causes, and it should be dropped from the standard sequence in dh.
Dropping dh_dwz from the standard sequence in dh could also be done
in the compat levels 12 and 13 since such a change should not cause
user-visible changes (except for a slight size increase of -dbgsym)
Ignoring errors from dh_dwz by default might work if we can trust
that dwz does not touch the file in case of errors, but it feels
wrong to ignore errors.
[1] https://codesearch.debian.net/search?q=override_dh_dwz&literal=1
[2]
https://sources.debian.org/src/qt6-base/6.2.4%2Bdfsg-10~bpo11%2B1/debian/rules/#L97
[3] https://sources.debian.org/src/qtcreator/8.0.0-2/debian/rules/#L66
[4] https://bugs.debian.org/1016329
[5] https://bugs.debian.org/1016330
--- End Message ---
--- Begin Message ---
Source: debhelper
Source-Version: 13.25
Done: Niels Thykier <[email protected]>
We believe that the bug you reported is fixed in the latest version of
debhelper, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Niels Thykier <[email protected]> (supplier of updated debhelper package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Sun, 10 Aug 2025 06:51:00 +0000
Source: debhelper
Architecture: source
Version: 13.25
Distribution: unstable
Urgency: medium
Maintainer: Debhelper Maintainers <[email protected]>
Changed-By: Niels Thykier <[email protected]>
Closes: 638517 1016563 1079181 1107373
Changes:
debhelper (13.25) unstable; urgency=medium
.
[ Niels Thykier ]
* debhelper-documentation.json: Correct command for `.ucf` files
* dh: Support `DH_OVERRIDDEN_COMMAND` variable for `override` targets
for cases where the original command is useful as a base.
* debhelper.pod: Update description on automated dependencies
* dh_gencontrol: Fix off-by-one compat guard affecting compat 14.
* In compat 14: Add `Commands` field to binaries to aid `command-not-found`
(Closes: #638517)
* dh_assistant: Explicitly use `JSON::PP::{true,false}`
* dh_assistant: Provide a compat upgrade checklist when upgrading from
compat 7 and on. This can be done via the command
`dh_assistant compat-upgrade-checklist`.
* No longer run `dh_dwz` by default in compat 14+ (Closes: 1016563)
.
[ Andrea Pappacoda ]
* dh_installmodules: install .modprobe files in /usr/lib with compat 14+
(Closes: #1107373)
.
[ Alexandre Detiste ]
* dh_assistant: Improve wording
.
[ Noah Meyerhans ]
* dh_installsystemd: Always stop the service on remove (Closes: #1079181)
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--- End Message ---
