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<h3 class="section">18.1 Target Selection</h3>
<p>A <dfn>target</dfn> is an object file format. A given target may be
supported for multiple architectures (see <a href="Architecture-Selection.html#Architecture-Selection">Architecture Selection</a>).
A target selection may also have variations for different operating
systems or architectures.
<p>The command to list valid target values is ‘<samp><span class="samp">objdump -i</span></samp>’
(the first column of output contains the relevant information).
<p>Some sample values are: ‘<samp><span class="samp">a.out-hp300bsd</span></samp>’, ‘<samp><span class="samp">ecoff-littlemips</span></samp>’,
‘<samp><span class="samp">a.out-sunos-big</span></samp>’.
<p>You can also specify a target using a configuration triplet. This is
the same sort of name that is passed to <samp><span class="file">configure</span></samp> to specify a
target. When you use a configuration triplet as an argument, it must be
fully canonicalized. You can see the canonical version of a triplet by
running the shell script <samp><span class="file">config.sub</span></samp> which is included with the
sources.
<p>Some sample configuration triplets are: ‘<samp><span class="samp">m68k-hp-bsd</span></samp>’,
‘<samp><span class="samp">mips-dec-ultrix</span></samp>’, ‘<samp><span class="samp">sparc-sun-sunos</span></samp>’.
<h4 class="subheading"><samp><span class="command">objdump</span></samp> Target</h4>
<p>Ways to specify:
<ol type=1 start=1>
<li>command line option: <samp><span class="option">-b</span></samp> or <samp><span class="option">--target</span></samp>
<li>environment variable <code>GNUTARGET</code>
<li>deduced from the input file
</ol>
<h4 class="subheading"><samp><span class="command">objcopy</span></samp> and <samp><span class="command">strip</span></samp> Input Target</h4>
<p>Ways to specify:
<ol type=1 start=1>
<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>
<li>environment variable <code>GNUTARGET</code>
<li>deduced from the input file
</ol>
<h4 class="subheading"><samp><span class="command">objcopy</span></samp> and <samp><span class="command">strip</span></samp> Output Target</h4>
<p>Ways to specify:
<ol type=1 start=1>
<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>
<li>the input target (see “<samp><span class="command">objcopy</span></samp> and <samp><span class="command">strip</span></samp> Input Target” above)
<li>environment variable <code>GNUTARGET</code>
<li>deduced from the input file
</ol>
<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>
<p>Ways to specify:
<ol type=1 start=1>
<li>command line option: <samp><span class="option">--target</span></samp>
<li>environment variable <code>GNUTARGET</code>
<li>deduced from the input file
</ol>
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