1DH_DWZ(1)                          Debhelper                         DH_DWZ(1)
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NAME

6       dh_dwz - optimize DWARF debug information in ELF binaries via dwz
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SYNOPSIS

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

12       dh_dwz is a debhelper program that will optimize the (uncompressed)
13       size of the DWARF debug information in ELF binaries.  It does so by
14       running dwz(1) on all the ELF binaries in the package.
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OPTIONS

17       --dwz-multifile, --no-dwz-multifile
18           Whether dwz(1) should generate a multifile from the ELF binaries in
19           the same package.  When enabled, if a package ships at least 2 ELF
20           binaries, dh_dwz will instruct dwz(1) to generate a multifile for
21           the package.
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23           By default, dh_dwz will attempt to create a multifile but will
24           continue without if dwz(1) does create one (but succeeds anyway).
25           This commonly happens when the debug files do not contain debug
26           symbols (e.g. a missing -g to the compiler) or when the debug
27           symbols are compressed (see Debian bug #931891).  If
28           --dwz-multifile is passed, then dh_dwz will abort with an error if
29           dwz(1) does not create a multifile.
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31           Note this options may not work if a package contains more ELF
32           binaries than can fit on a single command line.  If this becomes a
33           problem, please pass --no-dwz-multifile to work around the issue.
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35           The generated multifile will be compressed with objcopy
36           --compress-debug-sections.
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38           Note for udeb packages: dh_dwz will never generate multifiles for
39           udeb packages.  It will still use dwz to reduce the file size of
40           debug files if it finds any.
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42       -Xitem, --exclude=item
43           Exclude files that contain item anywhere in their filename from
44           being stripped. You may use this option multiple times to build up
45           a list of things to exclude.
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47       -- params
48           Pass params to dwz(1) when it processes ELF binaries.  This is
49           mostly useful for setting memory related parameters (e.g. -l and
50           -L).
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NOTES

53       If the DEB_BUILD_OPTIONS environment variable contains nostrip, nothing
54       will be stripped, in accordance with Debian policy (section 10.1
55       "Binaries").
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57       While this tool technically does not remove debug information from
58       binaries, it is still skipped when the DEB_BUILD_OPTIONS environment
59       variable contains nostrip.  This is because nostrip is often used to
60       optimize build times (e.g. for "build and test"-cycles) rather than
61       optimizing for size.
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SEE ALSO

64       debhelper(7)
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66       This program is a part of debhelper.
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AUTHOR

69       Niels Thykier <niels@thykier.net>
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7312.6.1                            2019-10-08                         DH_DWZ(1)
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