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| <h4 class="subsection">3.4.3 Commands Dealing with Object File Formats</h4> |
| |
| <p>A couple of linker script commands deal with object file formats. |
| |
| <dl> |
| <dt><code>OUTPUT_FORMAT(</code><var>bfdname</var><code>)</code><dt><code>OUTPUT_FORMAT(</code><var>default</var><code>, </code><var>big</var><code>, </code><var>little</var><code>)</code><dd><a name="index-OUTPUT_005fFORMAT_0028_0040var_007bbfdname_007d_0029-364"></a><a name="index-output-file-format-in-linker-script-365"></a>The <code>OUTPUT_FORMAT</code> command names the BFD format to use for the |
| output file (see <a href="BFD.html#BFD">BFD</a>). Using <code>OUTPUT_FORMAT(</code><var>bfdname</var><code>)</code> is |
| exactly like using ‘<samp><span class="samp">--oformat </span><var>bfdname</var></samp>’ on the command line |
| (see <a href="Options.html#Options">Command Line Options</a>). If both are used, the command |
| line option takes precedence. |
| |
| <p>You can use <code>OUTPUT_FORMAT</code> with three arguments to use different |
| formats based on the ‘<samp><span class="samp">-EB</span></samp>’ and ‘<samp><span class="samp">-EL</span></samp>’ command line options. |
| This permits the linker script to set the output format based on the |
| desired endianness. |
| |
| <p>If neither ‘<samp><span class="samp">-EB</span></samp>’ nor ‘<samp><span class="samp">-EL</span></samp>’ are used, then the output format |
| will be the first argument, <var>default</var>. If ‘<samp><span class="samp">-EB</span></samp>’ is used, the |
| output format will be the second argument, <var>big</var>. If ‘<samp><span class="samp">-EL</span></samp>’ is |
| used, the output format will be the third argument, <var>little</var>. |
| |
| <p>For example, the default linker script for the MIPS ELF target uses this |
| command: |
| <pre class="smallexample"> OUTPUT_FORMAT(elf32-bigmips, elf32-bigmips, elf32-littlemips) |
| </pre> |
| <p>This says that the default format for the output file is |
| ‘<samp><span class="samp">elf32-bigmips</span></samp>’, but if the user uses the ‘<samp><span class="samp">-EL</span></samp>’ command line |
| option, the output file will be created in the ‘<samp><span class="samp">elf32-littlemips</span></samp>’ |
| format. |
| |
| <br><dt><code>TARGET(</code><var>bfdname</var><code>)</code><dd><a name="index-TARGET_0028_0040var_007bbfdname_007d_0029-366"></a><a name="index-input-file-format-in-linker-script-367"></a>The <code>TARGET</code> command names the BFD format to use when reading input |
| files. It affects subsequent <code>INPUT</code> and <code>GROUP</code> commands. |
| This command is like using ‘<samp><span class="samp">-b </span><var>bfdname</var></samp>’ on the command line |
| (see <a href="Options.html#Options">Command Line Options</a>). If the <code>TARGET</code> command |
| is used but <code>OUTPUT_FORMAT</code> is not, then the last <code>TARGET</code> |
| command is also used to set the format for the output file. See <a href="BFD.html#BFD">BFD</a>. |
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