89 lines
4.4 KiB
HTML
89 lines
4.4 KiB
HTML
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<title>a - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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section entitled ``GNU Free Documentation License''.
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<div class="node">
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<p>
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<a name="a"></a>Next: <a rel="next" accesskey="n" href="alternate.html#alternate">alternate</a>,
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Up: <a rel="up" accesskey="u" href="Invoking.html#Invoking">Invoking</a>
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<hr><br>
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</div>
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<h3 class="section">2.1 Enable Listings: <span class="option">-a[cdghlns]</span></h3>
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<p><a name="index-_002da-47"></a><a name="index-_002dac-48"></a><a name="index-_002dad-49"></a><a name="index-_002dag-50"></a><a name="index-_002dah-51"></a><a name="index-_002dal-52"></a><a name="index-_002dan-53"></a><a name="index-_002das-54"></a><a name="index-listings_002c-enabling-55"></a><a name="index-assembly-listings_002c-enabling-56"></a>
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These options enable listing output from the assembler. By itself,
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<span class="samp">-a</span> requests high-level, assembly, and symbols listing.
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You can use other letters to select specific options for the list:
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<span class="samp">-ah</span> requests a high-level language listing,
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<span class="samp">-al</span> requests an output-program assembly listing, and
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<span class="samp">-as</span> requests a symbol table listing.
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High-level listings require that a compiler debugging option like
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<span class="samp">-g</span> be used, and that assembly listings (<span class="samp">-al</span>) be requested
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also.
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<p>Use the <span class="samp">-ag</span> option to print a first section with general assembly
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information, like as version, switches passed, or time stamp.
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<p>Use the <span class="samp">-ac</span> option to omit false conditionals from a listing. Any lines
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which are not assembled because of a false <code>.if</code> (or <code>.ifdef</code>, or any
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other conditional), or a true <code>.if</code> followed by an <code>.else</code>, will be
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omitted from the listing.
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<p>Use the <span class="samp">-ad</span> option to omit debugging directives from the
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listing.
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<p>Once you have specified one of these options, you can further control
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listing output and its appearance using the directives <code>.list</code>,
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<code>.nolist</code>, <code>.psize</code>, <code>.eject</code>, <code>.title</code>, and
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<code>.sbttl</code>.
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The <span class="samp">-an</span> option turns off all forms processing.
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If you do not request listing output with one of the <span class="samp">-a</span> options, the
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listing-control directives have no effect.
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<p>The letters after <span class="samp">-a</span> may be combined into one option,
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<em>e.g.</em>, <span class="samp">-aln</span>.
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<p>Note if the assembler source is coming from the standard input (e.g.,
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because it
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is being created by <code>gcc</code> and the <span class="samp">-pipe</span> command line switch
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is being used) then the listing will not contain any comments or preprocessor
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directives. This is because the listing code buffers input source lines from
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stdin only after they have been preprocessed by the assembler. This reduces
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memory usage and makes the code more efficient.
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</body></html>
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