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| <h3 class="section">1.6 Output (Object) File</h3> |
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| <p><a name="index-object-file-34"></a><a name="index-output-file-35"></a><a name="index-a_002eout-36"></a><a name="index-g_t_002eo-37"></a>Every time you run <samp><span class="command">as</span></samp> it produces an output file, which is |
| your assembly language program translated into numbers. This file |
| is the object file. Its default name is |
| <code>a.out</code>. |
| You can give it another name by using the <samp><span class="option">-o</span></samp> option. Conventionally, |
| object file names end with <samp><span class="file">.o</span></samp>. The default name is used for historical |
| reasons: older assemblers were capable of assembling self-contained programs |
| directly into a runnable program. (For some formats, this isn't currently |
| possible, but it can be done for the <code>a.out</code> format.) |
| |
| <p><a name="index-linker-38"></a><a name="index-ld-39"></a>The object file is meant for input to the linker <code>ld</code>. It contains |
| assembled program code, information to help <code>ld</code> integrate |
| the assembled program into a runnable file, and (optionally) symbolic |
| information for the debugger. |
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