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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | SEE ALSO | AUTHOR | COLOPHON |
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DH_DWZ(1) Debhelper DH_DWZ(1)
dh_dwz - optimize DWARF debug information in ELF binaries via dwz
dh_dwz [debhelper options] [-Xitem] [-- params]
dh_dwz is a debhelper program that will optimize the
(uncompressed) size of the DWARF debug information in ELF
binaries. It does so by running dwz(1) on all the ELF binaries in
the package.
--dwz-multifile, --no-dwz-multifile
Whether dwz(1) should generate a multifile from the ELF
binaries in the same package. When enabled, if a package
ships at least 2 ELF binaries, dh_dwz will instruct dwz(1) to
generate a multifile for the package.
By default, dh_dwz will attempt to create a multifile but will
continue without if dwz(1) does not create one (but succeeds
anyway). This commonly happens when the debug files do not
contain debug symbols (e.g. a missing -g to the compiler) or
when the debug symbols are compressed (see Debian bug
#931891). If --dwz-multifile is passed, then dh_dwz will
abort with an error if dwz(1) does not create a multifile.
Note this options may not work if a package contains more ELF
binaries than can fit on a single command line. If this
becomes a problem, please pass --no-dwz-multifile to work
around the issue.
The generated multifile will be compressed with objcopy
--compress-debug-sections.
Note for udeb packages: dh_dwz will never generate multifiles
for udeb packages. It will still use dwz to reduce the file
size of debug files if it finds any.
-Xitem, --exclude=item
Exclude files that contain item anywhere in their filename
from being stripped. You may use this option multiple times to
build up a list of things to exclude.
-- params
Pass params to dwz(1) when it processes ELF binaries. This is
mostly useful for setting memory related parameters (e.g. -l
and -L).
If the DEB_BUILD_OPTIONS environment variable contains nostrip,
nothing will be stripped, in accordance with Debian policy
(section 10.1 "Binaries").
While this tool technically does not remove debug information from
binaries, it is still skipped when the DEB_BUILD_OPTIONS
environment variable contains nostrip. This is because nostrip is
often used to optimize build times (e.g. for "build and
test"-cycles) rather than optimizing for size.
debhelper(7)
This program is a part of debhelper.
Niels Thykier <niels@thykier.net>
This page is part of the debhelper (helper programs for
debian/rules) project. Information about the project can be found
at [unknown -- if you know, please contact man-pages@man7.org] If
you have a bug report for this manual page, send it to
submit@bugs.debian.org. This page was obtained from the project's
upstream Git repository
⟨https://salsa.debian.org/debian/debhelper.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-10.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
13.15.3 2024-06-07 DH_DWZ(1)
Pages that refer to this page: dh(1), debhelper(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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