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119 lines
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<title>Target Selection - GNU Binary Utilities</title>
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<a name="Target-Selection"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Architecture-Selection.html#Architecture-Selection">Architecture Selection</a>,
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Up: <a rel="up" accesskey="u" href="Selecting-the-Target-System.html#Selecting-the-Target-System">Selecting the Target System</a>
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<h3 class="section">17.1 Target Selection</h3>
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<p>A <dfn>target</dfn> is an object file format. A given target may be
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supported for multiple architectures (see <a href="Architecture-Selection.html#Architecture-Selection">Architecture Selection</a>).
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A target selection may also have variations for different operating
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systems or architectures.
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<p>The command to list valid target values is ‘<samp><span class="samp">objdump -i</span></samp>’
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(the first column of output contains the relevant information).
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<p>Some sample values are: ‘<samp><span class="samp">a.out-hp300bsd</span></samp>’, ‘<samp><span class="samp">ecoff-littlemips</span></samp>’,
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‘<samp><span class="samp">a.out-sunos-big</span></samp>’.
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<p>You can also specify a target using a configuration triplet. This is
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the same sort of name that is passed to <samp><span class="file">configure</span></samp> to specify a
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target. When you use a configuration triplet as an argument, it must be
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fully canonicalized. You can see the canonical version of a triplet by
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running the shell script <samp><span class="file">config.sub</span></samp> which is included with the
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sources.
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<p>Some sample configuration triplets are: ‘<samp><span class="samp">m68k-hp-bsd</span></samp>’,
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‘<samp><span class="samp">mips-dec-ultrix</span></samp>’, ‘<samp><span class="samp">sparc-sun-sunos</span></samp>’.
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<h4 class="subheading"><samp><span class="command">objdump</span></samp> Target</h4>
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<p>Ways to specify:
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<ol type=1 start=1>
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<li>command-line option: <samp><span class="option">-b</span></samp> or <samp><span class="option">--target</span></samp>
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<li>environment variable <code>GNUTARGET</code>
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<li>deduced from the input file
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</ol>
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<h4 class="subheading"><samp><span class="command">objcopy</span></samp> and <samp><span class="command">strip</span></samp> Input Target</h4>
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<p>Ways to specify:
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<ol type=1 start=1>
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<li>command-line options: <samp><span class="option">-I</span></samp> or <samp><span class="option">--input-target</span></samp>, or <samp><span class="option">-F</span></samp> or <samp><span class="option">--target</span></samp>
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<li>environment variable <code>GNUTARGET</code>
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<li>deduced from the input file
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</ol>
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<h4 class="subheading"><samp><span class="command">objcopy</span></samp> and <samp><span class="command">strip</span></samp> Output Target</h4>
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<p>Ways to specify:
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<ol type=1 start=1>
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<li>command-line options: <samp><span class="option">-O</span></samp> or <samp><span class="option">--output-target</span></samp>, or <samp><span class="option">-F</span></samp> or <samp><span class="option">--target</span></samp>
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<li>the input target (see “<samp><span class="command">objcopy</span></samp> and <samp><span class="command">strip</span></samp> Input Target” above)
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<li>environment variable <code>GNUTARGET</code>
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<li>deduced from the input file
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</ol>
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<h4 class="subheading"><samp><span class="command">nm</span></samp>, <samp><span class="command">size</span></samp>, and <samp><span class="command">strings</span></samp> Target</h4>
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<p>Ways to specify:
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<ol type=1 start=1>
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<li>command-line option: <samp><span class="option">--target</span></samp>
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<li>environment variable <code>GNUTARGET</code>
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<li>deduced from the input file
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</ol>
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</body></html>
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