142 lines
4.3 KiB
HTML
142 lines
4.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of DH_DWZ</TITLE>
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</HEAD><BODY>
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<H1>DH_DWZ</H1>
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Section: Debhelper (1)<BR>Updated: 2020-03-27<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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dh_dwz - optimize DWARF debug information in ELF binaries via dwz
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>dh_dwz</B> [<I>debhelper options</I>] [<B>-X</B><I>item</I>] [<B>--</B> <I>params</I>]
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>dh_dwz</B> is a debhelper program that will optimize the (uncompressed)
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size of the <FONT SIZE="-1">DWARF</FONT> debug information in <FONT SIZE="-1">ELF</FONT> binaries. It does so by
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running <B><A HREF="/cgi-bin/man/man2html?1+dwz">dwz</A></B>(1) on all the <FONT SIZE="-1">ELF</FONT> binaries in the package.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT id="1"><B>--dwz-multifile</B>, <B>--no-dwz-multifile</B><DD>
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Whether <B><A HREF="/cgi-bin/man/man2html?1+dwz">dwz</A></B>(1) should generate a <I>multifile</I> from the <FONT SIZE="-1">ELF</FONT> binaries
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in the same package. When enabled, if a package ships at least 2 <FONT SIZE="-1">ELF</FONT>
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binaries, <B>dh_dwz</B> will instruct <B><A HREF="/cgi-bin/man/man2html?1+dwz">dwz</A></B>(1) to generate a multifile
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for the package.
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<P>
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By default, <B>dh_dwz</B> will attempt to create a multifile but will
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continue without if <B><A HREF="/cgi-bin/man/man2html?1+dwz">dwz</A></B>(1) does not create one (but succeeds anyway).
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This commonly happens when the debug files do not contain debug
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symbols (e.g. a missing -g to the compiler) or when the debug
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symbols are compressed (see Debian bug #931891). If <B>--dwz-multifile</B>
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is passed, then <B>dh_dwz</B> will abort with an error if <B><A HREF="/cgi-bin/man/man2html?1+dwz">dwz</A></B>(1) does
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not create a multifile.
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<P>
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Note this options may not work if a package contains more <FONT SIZE="-1">ELF</FONT> binaries
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than can fit on a single command line. If this becomes a problem,
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please pass <B>--no-dwz-multifile</B> to work around the issue.
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<P>
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The generated multifile will be compressed with <B>objcopy
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--compress-debug-sections</B>.
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<P>
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Note for <B>udeb</B> packages: <B>dh_dwz</B> will never generate multifiles
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for <B>udeb</B> packages. It will still use <B>dwz</B> to reduce the
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file size of debug files if it finds any.
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<DT id="2"><B>-X</B><I>item</I>, <B>--exclude=</B><I>item</I><DD>
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Exclude files that contain <I>item</I> anywhere in their filename from being
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stripped. You may use this option multiple times to build up a list of
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things to exclude.
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<DT id="3"><B>--</B> <I>params</I><DD>
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Pass <I>params</I> to <B><A HREF="/cgi-bin/man/man2html?1+dwz">dwz</A></B>(1) when it processes <FONT SIZE="-1">ELF</FONT> binaries. This is
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mostly useful for setting memory related parameters (e.g. -l and -L).
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</DL>
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<A NAME="lbAF"> </A>
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<H2>NOTES</H2>
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If the <B></B><FONT SIZE="-1"><B>DEB_BUILD_OPTIONS</B></FONT><B></B> environment variable contains <B>nostrip</B>,
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nothing will be stripped, in accordance with Debian policy (section
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10.1 ``Binaries'').
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<P>
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While this tool technically does not remove debug information from
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binaries, it is still skipped when the <B></B><FONT SIZE="-1"><B>DEB_BUILD_OPTIONS</B></FONT><B></B>
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environment variable contains <B>nostrip</B>. This is because <B>nostrip</B>
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is often used to optimize build times (e.g. for ``build and
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test''-cycles) rather than optimizing for size.
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?7+debhelper">debhelper</A></B>(7)
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<P>
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This program is a part of debhelper.
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<A NAME="lbAH"> </A>
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<H2>AUTHOR</H2>
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Niels Thykier <<A HREF="mailto:niels@thykier.net">niels@thykier.net</A>>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="8"><A HREF="#lbAF">NOTES</A><DD>
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<DT id="9"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="10"><A HREF="#lbAH">AUTHOR</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:10 GMT, March 31, 2021
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</BODY>
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</HTML>
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