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| Next: <a rel="next" accesskey="n" href="Architecture-Selection.html#Architecture-Selection">Architecture Selection</a>, |
| 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">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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