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226 lines
15 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>strip - GNU Binary Utilities</title>
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<meta name="description" content="GNU Binary Utilities">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="strings.html#strings" title="strings">
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<link rel="next" href="c_002b_002bfilt.html#c_002b_002bfilt" title="c++filt">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="strip"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="c_002b_002bfilt.html#c_002b_002bfilt">c++filt</a>,
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Previous: <a rel="previous" accesskey="p" href="strings.html#strings">strings</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="chapter">8 strip</h2>
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<p><a name="index-strip-128"></a><a name="index-removing-symbols-129"></a><a name="index-discarding-symbols-130"></a><a name="index-symbols_002c-discarding-131"></a>
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<!-- man title strip Discard symbols from object files. -->
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<pre class="smallexample"> <!-- man begin SYNOPSIS strip -->
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strip [<samp><span class="option">-F</span></samp> <var>bfdname</var> |<samp><span class="option">--target=</span></samp><var>bfdname</var>]
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[<samp><span class="option">-I</span></samp> <var>bfdname</var> |<samp><span class="option">--input-target=</span></samp><var>bfdname</var>]
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[<samp><span class="option">-O</span></samp> <var>bfdname</var> |<samp><span class="option">--output-target=</span></samp><var>bfdname</var>]
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[<samp><span class="option">-s</span></samp>|<samp><span class="option">--strip-all</span></samp>]
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[<samp><span class="option">-S</span></samp>|<samp><span class="option">-g</span></samp>|<samp><span class="option">-d</span></samp>|<samp><span class="option">--strip-debug</span></samp>]
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[<samp><span class="option">--strip-dwo</span></samp>]
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[<samp><span class="option">-K</span></samp> <var>symbolname</var> |<samp><span class="option">--keep-symbol=</span></samp><var>symbolname</var>]
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[<samp><span class="option">-N</span></samp> <var>symbolname</var> |<samp><span class="option">--strip-symbol=</span></samp><var>symbolname</var>]
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[<samp><span class="option">-w</span></samp>|<samp><span class="option">--wildcard</span></samp>]
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[<samp><span class="option">-x</span></samp>|<samp><span class="option">--discard-all</span></samp>] [<samp><span class="option">-X</span></samp> |<samp><span class="option">--discard-locals</span></samp>]
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[<samp><span class="option">-R</span></samp> <var>sectionname</var> |<samp><span class="option">--remove-section=</span></samp><var>sectionname</var>]
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[<samp><span class="option">-o</span></samp> <var>file</var>] [<samp><span class="option">-p</span></samp>|<samp><span class="option">--preserve-dates</span></samp>]
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[<samp><span class="option">-D</span></samp>|<samp><span class="option">--enable-deterministic-archives</span></samp>]
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[<samp><span class="option">-U</span></samp>|<samp><span class="option">--disable-deterministic-archives</span></samp>]
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[<samp><span class="option">--keep-file-symbols</span></samp>]
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[<samp><span class="option">--only-keep-debug</span></samp>]
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[<samp><span class="option">-v</span></samp> |<samp><span class="option">--verbose</span></samp>] [<samp><span class="option">-V</span></samp>|<samp><span class="option">--version</span></samp>]
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[<samp><span class="option">--help</span></samp>] [<samp><span class="option">--info</span></samp>]
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<var>objfile</var>...
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<!-- man end -->
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</pre>
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<!-- man begin DESCRIPTION strip -->
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<p><span class="sc">gnu</span> <samp><span class="command">strip</span></samp> discards all symbols from object files
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<var>objfile</var>. The list of object files may include archives.
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At least one object file must be given.
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<p><samp><span class="command">strip</span></samp> modifies the files named in its argument,
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rather than writing modified copies under different names.
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<!-- man end -->
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<!-- man begin OPTIONS strip -->
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<dl>
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<dt><samp><span class="env">-F </span><var>bfdname</var></samp><dt><samp><span class="env">--target=</span><var>bfdname</var></samp><dd>Treat the original <var>objfile</var> as a file with the object
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code format <var>bfdname</var>, and rewrite it in the same format.
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See <a href="Target-Selection.html#Target-Selection">Target Selection</a>, for more information.
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<br><dt><samp><span class="env">--help</span></samp><dd>Show a summary of the options to <samp><span class="command">strip</span></samp> and exit.
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<br><dt><samp><span class="env">--info</span></samp><dd>Display a list showing all architectures and object formats available.
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<br><dt><samp><span class="env">-I </span><var>bfdname</var></samp><dt><samp><span class="env">--input-target=</span><var>bfdname</var></samp><dd>Treat the original <var>objfile</var> as a file with the object
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code format <var>bfdname</var>.
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See <a href="Target-Selection.html#Target-Selection">Target Selection</a>, for more information.
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<br><dt><samp><span class="env">-O </span><var>bfdname</var></samp><dt><samp><span class="env">--output-target=</span><var>bfdname</var></samp><dd>Replace <var>objfile</var> with a file in the output format <var>bfdname</var>.
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See <a href="Target-Selection.html#Target-Selection">Target Selection</a>, for more information.
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<br><dt><samp><span class="env">-R </span><var>sectionname</var></samp><dt><samp><span class="env">--remove-section=</span><var>sectionname</var></samp><dd>Remove any section named <var>sectionname</var> from the output file, in
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addition to whatever sections would otherwise be removed. This
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option may be given more than once. Note that using this option
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inappropriately may make the output file unusable. The wildcard
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character ‘<samp><span class="samp">*</span></samp>’ may be given at the end of <var>sectionname</var>. If
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so, then any section starting with <var>sectionname</var> will be removed.
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<br><dt><samp><span class="env">-s</span></samp><dt><samp><span class="env">--strip-all</span></samp><dd>Remove all symbols.
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<br><dt><samp><span class="env">-g</span></samp><dt><samp><span class="env">-S</span></samp><dt><samp><span class="env">-d</span></samp><dt><samp><span class="env">--strip-debug</span></samp><dd>Remove debugging symbols only.
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<br><dt><samp><span class="env">--strip-dwo</span></samp><dd>Remove the contents of all DWARF .dwo sections, leaving the
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remaining debugging sections and all symbols intact.
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See the description of this option in the <samp><span class="command">objcopy</span></samp> section
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for more information.
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<br><dt><samp><span class="env">--strip-unneeded</span></samp><dd>Remove all symbols that are not needed for relocation processing.
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<br><dt><samp><span class="env">-K </span><var>symbolname</var></samp><dt><samp><span class="env">--keep-symbol=</span><var>symbolname</var></samp><dd>When stripping symbols, keep symbol <var>symbolname</var> even if it would
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normally be stripped. This option may be given more than once.
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<br><dt><samp><span class="env">-N </span><var>symbolname</var></samp><dt><samp><span class="env">--strip-symbol=</span><var>symbolname</var></samp><dd>Remove symbol <var>symbolname</var> from the source file. This option may be
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given more than once, and may be combined with strip options other than
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<samp><span class="option">-K</span></samp>.
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<br><dt><samp><span class="env">-o </span><var>file</var></samp><dd>Put the stripped output in <var>file</var>, rather than replacing the
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existing file. When this argument is used, only one <var>objfile</var>
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argument may be specified.
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<br><dt><samp><span class="env">-p</span></samp><dt><samp><span class="env">--preserve-dates</span></samp><dd>Preserve the access and modification dates of the file.
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<br><dt><samp><span class="env">-D</span></samp><dt><samp><span class="env">--enable-deterministic-archives</span></samp><dd><a name="index-deterministic-archives-132"></a><a name="index-g_t_002d_002denable_002ddeterministic_002darchives-133"></a>Operate in <em>deterministic</em> mode. When copying archive members
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and writing the archive index, use zero for UIDs, GIDs, timestamps,
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and use consistent file modes for all files.
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<p>If <samp><span class="file">binutils</span></samp> was configured with
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<samp><span class="option">--enable-deterministic-archives</span></samp>, then this mode is on by default.
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It can be disabled with the ‘<samp><span class="samp">-U</span></samp>’ option, below.
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<br><dt><samp><span class="env">-U</span></samp><dt><samp><span class="env">--disable-deterministic-archives</span></samp><dd><a name="index-deterministic-archives-134"></a><a name="index-g_t_002d_002denable_002ddeterministic_002darchives-135"></a>Do <em>not</em> operate in <em>deterministic</em> mode. This is the
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inverse of the <samp><span class="option">-D</span></samp> option, above: when copying archive members
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and writing the archive index, use their actual UID, GID, timestamp,
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and file mode values.
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<p>This is the default unless <samp><span class="file">binutils</span></samp> was configured with
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<samp><span class="option">--enable-deterministic-archives</span></samp>.
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<br><dt><samp><span class="env">-w</span></samp><dt><samp><span class="env">--wildcard</span></samp><dd>Permit regular expressions in <var>symbolname</var>s used in other command
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line options. The question mark (?), asterisk (*), backslash (\) and
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square brackets ([]) operators can be used anywhere in the symbol
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name. If the first character of the symbol name is the exclamation
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point (!) then the sense of the switch is reversed for that symbol.
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For example:
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<pre class="smallexample"> -w -K !foo -K fo*
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</pre>
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<p>would cause strip to only keep symbols that start with the letters
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“fo”, but to discard the symbol “foo”.
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<br><dt><samp><span class="env">-x</span></samp><dt><samp><span class="env">--discard-all</span></samp><dd>Remove non-global symbols.
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<br><dt><samp><span class="env">-X</span></samp><dt><samp><span class="env">--discard-locals</span></samp><dd>Remove compiler-generated local symbols.
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(These usually start with ‘<samp><span class="samp">L</span></samp>’ or ‘<samp><span class="samp">.</span></samp>’.)
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<br><dt><samp><span class="env">--keep-file-symbols</span></samp><dd>When stripping a file, perhaps with <samp><span class="option">--strip-debug</span></samp> or
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<samp><span class="option">--strip-unneeded</span></samp>, retain any symbols specifying source file names,
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which would otherwise get stripped.
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<br><dt><samp><span class="env">--only-keep-debug</span></samp><dd>Strip a file, emptying the contents of any sections that would not be
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stripped by <samp><span class="option">--strip-debug</span></samp> and leaving the debugging sections
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intact. In ELF files, this preserves all the note sections in the
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output as well.
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<p>Note - the section headers of the stripped sections are preserved,
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including their sizes, but the contents of the section are discarded.
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The section headers are preserved so that other tools can match up the
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debuginfo file with the real executable, even if that executable has
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been relocated to a different address space.
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<p>The intention is that this option will be used in conjunction with
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<samp><span class="option">--add-gnu-debuglink</span></samp> to create a two part executable. One a
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stripped binary which will occupy less space in RAM and in a
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distribution and the second a debugging information file which is only
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needed if debugging abilities are required. The suggested procedure
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to create these files is as follows:
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<ol type=1 start=1>
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<li>Link the executable as normal. Assuming that is is called
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<code>foo</code> then...
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<li>Run <code>objcopy --only-keep-debug foo foo.dbg</code> to
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create a file containing the debugging info.
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<li>Run <code>objcopy --strip-debug foo</code> to create a
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stripped executable.
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<li>Run <code>objcopy --add-gnu-debuglink=foo.dbg foo</code>
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to add a link to the debugging info into the stripped executable.
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</ol>
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<p>Note—the choice of <code>.dbg</code> as an extension for the debug info
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file is arbitrary. Also the <code>--only-keep-debug</code> step is
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optional. You could instead do this:
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<ol type=1 start=1>
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<li>Link the executable as normal.
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<li>Copy <code>foo</code> to <code>foo.full</code>
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<li>Run <code>strip --strip-debug foo</code>
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<li>Run <code>objcopy --add-gnu-debuglink=foo.full foo</code>
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</ol>
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<p>i.e., the file pointed to by the <samp><span class="option">--add-gnu-debuglink</span></samp> can be the
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full executable. It does not have to be a file created by the
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<samp><span class="option">--only-keep-debug</span></samp> switch.
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<p>Note—this switch is only intended for use on fully linked files. It
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does not make sense to use it on object files where the debugging
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information may be incomplete. Besides the gnu_debuglink feature
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currently only supports the presence of one filename containing
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debugging information, not multiple filenames on a one-per-object-file
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basis.
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<br><dt><samp><span class="env">-V</span></samp><dt><samp><span class="env">--version</span></samp><dd>Show the version number for <samp><span class="command">strip</span></samp>.
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<br><dt><samp><span class="env">-v</span></samp><dt><samp><span class="env">--verbose</span></samp><dd>Verbose output: list all object files modified. In the case of
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archives, ‘<samp><span class="samp">strip -v</span></samp>’ lists all members of the archive.
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</dl>
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<!-- man end -->
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</body></html>
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