dh_dwz(1) — Linux manual page


DH_DWZ(1)                       Debhelper                      DH_DWZ(1)

NAME         top

       dh_dwz - optimize DWARF debug information in ELF binaries via dwz

SYNOPSIS         top

       dh_dwz [debhelper options] [-Xitem] [-- params]

DESCRIPTION         top

       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.

OPTIONS         top

       --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

           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

           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).

NOTES         top

       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.

SEE ALSO         top


       This program is a part of debhelper.

AUTHOR         top

       Niels Thykier <niels@thykier.net>

COLOPHON         top

       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 2023-06-23.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-03-05.)  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

13.11.1                        2022-12-14                      DH_DWZ(1)

Pages that refer to this page: dh(1)debhelper(7)