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| <a name="strip-1"></a> |
| <h2 class="chapter">8 strip</h2> |
| |
| <a name="index-strip"></a> |
| <a name="index-removing-symbols"></a> |
| <a name="index-discarding-symbols"></a> |
| <a name="index-symbols_002c-discarding"></a> |
| |
| |
| <div class="smallexample"> |
| <pre class="smallexample">strip [<samp>-F</samp> <var>bfdname</var> |<samp>--target=</samp><var>bfdname</var>] |
| [<samp>-I</samp> <var>bfdname</var> |<samp>--input-target=</samp><var>bfdname</var>] |
| [<samp>-O</samp> <var>bfdname</var> |<samp>--output-target=</samp><var>bfdname</var>] |
| [<samp>-s</samp>|<samp>--strip-all</samp>] |
| [<samp>-S</samp>|<samp>-g</samp>|<samp>-d</samp>|<samp>--strip-debug</samp>] |
| [<samp>--strip-dwo</samp>] |
| [<samp>-K</samp> <var>symbolname</var> |<samp>--keep-symbol=</samp><var>symbolname</var>] |
| [<samp>-N</samp> <var>symbolname</var> |<samp>--strip-symbol=</samp><var>symbolname</var>] |
| [<samp>-w</samp>|<samp>--wildcard</samp>] |
| [<samp>-x</samp>|<samp>--discard-all</samp>] [<samp>-X</samp> |<samp>--discard-locals</samp>] |
| [<samp>-R</samp> <var>sectionname</var> |<samp>--remove-section=</samp><var>sectionname</var>] |
| [<samp>-o</samp> <var>file</var>] [<samp>-p</samp>|<samp>--preserve-dates</samp>] |
| [<samp>-D</samp>|<samp>--enable-deterministic-archives</samp>] |
| [<samp>-U</samp>|<samp>--disable-deterministic-archives</samp>] |
| [<samp>--keep-file-symbols</samp>] |
| [<samp>--only-keep-debug</samp>] |
| [<samp>-v</samp> |<samp>--verbose</samp>] [<samp>-V</samp>|<samp>--version</samp>] |
| [<samp>--help</samp>] [<samp>--info</samp>] |
| <var>objfile</var>… |
| </pre></div> |
| |
| |
| <p><small>GNU</small> <code>strip</code> discards all symbols from object files |
| <var>objfile</var>. The list of object files may include archives. |
| At least one object file must be given. |
| </p> |
| <p><code>strip</code> modifies the files named in its argument, |
| rather than writing modified copies under different names. |
| </p> |
| |
| |
| <dl compact="compact"> |
| <dt><code>-F <var>bfdname</var></code></dt> |
| <dt><code>--target=<var>bfdname</var></code></dt> |
| <dd><p>Treat the original <var>objfile</var> as a file with the object |
| code format <var>bfdname</var>, and rewrite it in the same format. |
| See <a href="Target-Selection.html#Target-Selection">Target Selection</a>, for more information. |
| </p> |
| </dd> |
| <dt><code>--help</code></dt> |
| <dd><p>Show a summary of the options to <code>strip</code> and exit. |
| </p> |
| </dd> |
| <dt><code>--info</code></dt> |
| <dd><p>Display a list showing all architectures and object formats available. |
| </p> |
| </dd> |
| <dt><code>-I <var>bfdname</var></code></dt> |
| <dt><code>--input-target=<var>bfdname</var></code></dt> |
| <dd><p>Treat the original <var>objfile</var> as a file with the object |
| code format <var>bfdname</var>. |
| See <a href="Target-Selection.html#Target-Selection">Target Selection</a>, for more information. |
| </p> |
| </dd> |
| <dt><code>-O <var>bfdname</var></code></dt> |
| <dt><code>--output-target=<var>bfdname</var></code></dt> |
| <dd><p>Replace <var>objfile</var> with a file in the output format <var>bfdname</var>. |
| See <a href="Target-Selection.html#Target-Selection">Target Selection</a>, for more information. |
| </p> |
| </dd> |
| <dt><code>-R <var>sectionname</var></code></dt> |
| <dt><code>--remove-section=<var>sectionname</var></code></dt> |
| <dd><p>Remove any section named <var>sectionname</var> from the output file, in |
| addition to whatever sections would otherwise be removed. This |
| option may be given more than once. Note that using this option |
| inappropriately may make the output file unusable. The wildcard |
| character ‘<samp>*</samp>’ may be given at the end of <var>sectionname</var>. If |
| so, then any section starting with <var>sectionname</var> will be removed. |
| </p> |
| </dd> |
| <dt><code>-s</code></dt> |
| <dt><code>--strip-all</code></dt> |
| <dd><p>Remove all symbols. |
| </p> |
| </dd> |
| <dt><code>-g</code></dt> |
| <dt><code>-S</code></dt> |
| <dt><code>-d</code></dt> |
| <dt><code>--strip-debug</code></dt> |
| <dd><p>Remove debugging symbols only. |
| </p> |
| </dd> |
| <dt><code>--strip-dwo</code></dt> |
| <dd><p>Remove the contents of all DWARF .dwo sections, leaving the |
| remaining debugging sections and all symbols intact. |
| See the description of this option in the <code>objcopy</code> section |
| for more information. |
| </p> |
| </dd> |
| <dt><code>--strip-unneeded</code></dt> |
| <dd><p>Remove all symbols that are not needed for relocation processing. |
| </p> |
| </dd> |
| <dt><code>-K <var>symbolname</var></code></dt> |
| <dt><code>--keep-symbol=<var>symbolname</var></code></dt> |
| <dd><p>When stripping symbols, keep symbol <var>symbolname</var> even if it would |
| normally be stripped. This option may be given more than once. |
| </p> |
| </dd> |
| <dt><code>-N <var>symbolname</var></code></dt> |
| <dt><code>--strip-symbol=<var>symbolname</var></code></dt> |
| <dd><p>Remove symbol <var>symbolname</var> from the source file. This option may be |
| given more than once, and may be combined with strip options other than |
| <samp>-K</samp>. |
| </p> |
| </dd> |
| <dt><code>-o <var>file</var></code></dt> |
| <dd><p>Put the stripped output in <var>file</var>, rather than replacing the |
| existing file. When this argument is used, only one <var>objfile</var> |
| argument may be specified. |
| </p> |
| </dd> |
| <dt><code>-p</code></dt> |
| <dt><code>--preserve-dates</code></dt> |
| <dd><p>Preserve the access and modification dates of the file. |
| </p> |
| </dd> |
| <dt><code>-D</code></dt> |
| <dt><code>--enable-deterministic-archives</code></dt> |
| <dd><a name="index-deterministic-archives-6"></a> |
| <a name="index-_002d_002denable_002ddeterministic_002darchives-6"></a> |
| <p>Operate in <em>deterministic</em> mode. When copying archive members |
| and writing the archive index, use zero for UIDs, GIDs, timestamps, |
| and use consistent file modes for all files. |
| </p> |
| <p>If <samp>binutils</samp> was configured with |
| <samp>--enable-deterministic-archives</samp>, then this mode is on by default. |
| It can be disabled with the ‘<samp>-U</samp>’ option, below. |
| </p> |
| </dd> |
| <dt><code>-U</code></dt> |
| <dt><code>--disable-deterministic-archives</code></dt> |
| <dd><a name="index-deterministic-archives-7"></a> |
| <a name="index-_002d_002denable_002ddeterministic_002darchives-7"></a> |
| <p>Do <em>not</em> operate in <em>deterministic</em> mode. This is the |
| inverse of the <samp>-D</samp> option, above: when copying archive members |
| and writing the archive index, use their actual UID, GID, timestamp, |
| and file mode values. |
| </p> |
| <p>This is the default unless <samp>binutils</samp> was configured with |
| <samp>--enable-deterministic-archives</samp>. |
| </p> |
| </dd> |
| <dt><code>-w</code></dt> |
| <dt><code>--wildcard</code></dt> |
| <dd><p>Permit regular expressions in <var>symbolname</var>s used in other command |
| line options. The question mark (?), asterisk (*), backslash (\) and |
| square brackets ([]) operators can be used anywhere in the symbol |
| name. If the first character of the symbol name is the exclamation |
| point (!) then the sense of the switch is reversed for that symbol. |
| For example: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> -w -K !foo -K fo* |
| </pre></div> |
| |
| <p>would cause strip to only keep symbols that start with the letters |
| “fo”, but to discard the symbol “foo”. |
| </p> |
| </dd> |
| <dt><code>-x</code></dt> |
| <dt><code>--discard-all</code></dt> |
| <dd><p>Remove non-global symbols. |
| </p> |
| </dd> |
| <dt><code>-X</code></dt> |
| <dt><code>--discard-locals</code></dt> |
| <dd><p>Remove compiler-generated local symbols. |
| (These usually start with ‘<samp>L</samp>’ or ‘<samp>.</samp>’.) |
| </p> |
| </dd> |
| <dt><code>--keep-file-symbols</code></dt> |
| <dd><p>When stripping a file, perhaps with <samp>--strip-debug</samp> or |
| <samp>--strip-unneeded</samp>, retain any symbols specifying source file names, |
| which would otherwise get stripped. |
| </p> |
| </dd> |
| <dt><code>--only-keep-debug</code></dt> |
| <dd><p>Strip a file, removing contents of any sections that would not be |
| stripped by <samp>--strip-debug</samp> and leaving the debugging sections |
| intact. In ELF files, this preserves all note sections in the output. |
| </p> |
| <p>The intention is that this option will be used in conjunction with |
| <samp>--add-gnu-debuglink</samp> to create a two part executable. One a |
| stripped binary which will occupy less space in RAM and in a |
| distribution and the second a debugging information file which is only |
| needed if debugging abilities are required. The suggested procedure |
| to create these files is as follows: |
| </p> |
| <ol> |
| <li> Link the executable as normal. Assuming that is is called |
| <code>foo</code> then... |
| </li><li> Run <code>objcopy --only-keep-debug foo foo.dbg</code> to |
| create a file containing the debugging info. |
| </li><li> Run <code>objcopy --strip-debug foo</code> to create a |
| stripped executable. |
| </li><li> Run <code>objcopy --add-gnu-debuglink=foo.dbg foo</code> |
| to add a link to the debugging info into the stripped executable. |
| </li></ol> |
| |
| <p>Note—the choice of <code>.dbg</code> as an extension for the debug info |
| file is arbitrary. Also the <code>--only-keep-debug</code> step is |
| optional. You could instead do this: |
| </p> |
| <ol> |
| <li> Link the executable as normal. |
| </li><li> Copy <code>foo</code> to <code>foo.full</code> |
| </li><li> Run <code>strip --strip-debug foo</code> |
| </li><li> Run <code>objcopy --add-gnu-debuglink=foo.full foo</code> |
| </li></ol> |
| |
| <p>i.e., the file pointed to by the <samp>--add-gnu-debuglink</samp> can be the |
| full executable. It does not have to be a file created by the |
| <samp>--only-keep-debug</samp> switch. |
| </p> |
| <p>Note—this switch is only intended for use on fully linked files. It |
| does not make sense to use it on object files where the debugging |
| information may be incomplete. Besides the gnu_debuglink feature |
| currently only supports the presence of one filename containing |
| debugging information, not multiple filenames on a one-per-object-file |
| basis. |
| </p> |
| </dd> |
| <dt><code>-V</code></dt> |
| <dt><code>--version</code></dt> |
| <dd><p>Show the version number for <code>strip</code>. |
| </p> |
| </dd> |
| <dt><code>-v</code></dt> |
| <dt><code>--verbose</code></dt> |
| <dd><p>Verbose output: list all object files modified. In the case of |
| archives, ‘<samp>strip -v</samp>’ lists all members of the archive. |
| </p></dd> |
| </dl> |
| |
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