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.\" ========================================================================
.\"
.IX Title "DH_DWZ 1"
.TH DH_DWZ 1 "2019-09-14" "12.6" "Debhelper"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
dh_dwz \- optimize DWARF debug information in ELF binaries via dwz
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBdh_dwz\fR [\fIdebhelper options\fR] [\fB\-X\fR\fIitem\fR] [\fB\-\-\fR \fIparams\fR]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBdh_dwz\fR is a debhelper program that will optimize the (uncompressed)
size of the \s-1DWARF\s0 debug information in \s-1ELF\s0 binaries.  It does so by
running \fBdwz\fR\|(1) on all the \s-1ELF\s0 binaries in the package.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-\-dwz\-multifile\fR, \fB\-\-no\-dwz\-multifile\fR" 4
.IX Item "--dwz-multifile, --no-dwz-multifile"
Whether \fBdwz\fR\|(1) should generate a \fImultifile\fR from the \s-1ELF\s0 binaries
in the same package.  When enabled, if a package ships at least 2 \s-1ELF\s0
binaries, \fBdh_dwz\fR will instruct \fBdwz\fR\|(1) to generate a multifile
for the package.
.Sp
By default, \fBdh_dwz\fR will attempt to create a multifile but will
continue without if \fBdwz\fR\|(1) does 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 \fB\-\-dwz\-multifile\fR
is passed, then \fBdh_dwz\fR will abort with an error if \fBdwz\fR\|(1) does
not create a multifile.
.Sp
Note this options may not work if a package contains more \s-1ELF\s0 binaries
than can fit on a single command line.  If this becomes a problem,
please pass \fB\-\-no\-dwz\-multifile\fR to work around the issue.
.Sp
The generated multifile will be compressed with \fBobjcopy
\&\-\-compress\-debug\-sections\fR.
.Sp
Note for \fBudeb\fR packages: \fBdh_dwz\fR will never generate multifiles
for \fBudeb\fR packages.  It will still use \fBdwz\fR to reduce the
file size of debug files if it finds any.
.IP "\fB\-X\fR\fIitem\fR, \fB\-\-exclude=\fR\fIitem\fR" 4
.IX Item "-Xitem, --exclude=item"
Exclude files that contain \fIitem\fR anywhere in their filename from being
stripped. You may use this option multiple times to build up a list of
things to exclude.
.IP "\fB\-\-\fR \fIparams\fR" 4
.IX Item "-- params"
Pass \fIparams\fR to \fBdwz\fR\|(1) when it processes \s-1ELF\s0 binaries.  This is
mostly useful for setting memory related parameters (e.g. \-l and \-L).
.SH "NOTES"
.IX Header "NOTES"
If the \fB\s-1DEB_BUILD_OPTIONS\s0\fR environment variable contains \fBnostrip\fR,
nothing will be stripped, in accordance with Debian policy (section
10.1 \*(L"Binaries\*(R").
.PP
While this tool technically does not remove debug information from
binaries, it is still skipped when the \fB\s-1DEB_BUILD_OPTIONS\s0\fR
environment variable contains \fBnostrip\fR.  This is because \fBnostrip\fR
is often used to optimize build times (e.g. for \*(L"build and
test\*(R"\-cycles) rather than optimizing for size.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBdebhelper\fR\|(7)
.PP
This program is a part of debhelper.
.SH "AUTHOR"
.IX Header "AUTHOR"
Niels Thykier <niels@thykier.net>