| <html lang="en"> |
| <head> |
| <title>a - Using as</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using as"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Invoking.html#Invoking" title="Invoking"> |
| <link rel="next" href="alternate.html#alternate" title="alternate"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 2000, 2001, 2002, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 |
| or any later version published by the Free Software Foundation; |
| with no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled ``GNU Free Documentation License''. |
| |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="a"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="alternate.html#alternate">alternate</a>, |
| Up: <a rel="up" accesskey="u" href="Invoking.html#Invoking">Invoking</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">2.1 Enable Listings: <samp><span class="option">-a[cdghlns]</span></samp></h3> |
| |
| <p><a name="index-g_t_002da-47"></a><a name="index-g_t_002dac-48"></a><a name="index-g_t_002dad-49"></a><a name="index-g_t_002dag-50"></a><a name="index-g_t_002dah-51"></a><a name="index-g_t_002dal-52"></a><a name="index-g_t_002dan-53"></a><a name="index-g_t_002das-54"></a><a name="index-listings_002c-enabling-55"></a><a name="index-assembly-listings_002c-enabling-56"></a> |
| These options enable listing output from the assembler. By itself, |
| ‘<samp><span class="samp">-a</span></samp>’ requests high-level, assembly, and symbols listing. |
| You can use other letters to select specific options for the list: |
| ‘<samp><span class="samp">-ah</span></samp>’ requests a high-level language listing, |
| ‘<samp><span class="samp">-al</span></samp>’ requests an output-program assembly listing, and |
| ‘<samp><span class="samp">-as</span></samp>’ requests a symbol table listing. |
| High-level listings require that a compiler debugging option like |
| ‘<samp><span class="samp">-g</span></samp>’ be used, and that assembly listings (‘<samp><span class="samp">-al</span></samp>’) be requested |
| also. |
| |
| <p>Use the ‘<samp><span class="samp">-ag</span></samp>’ option to print a first section with general assembly |
| information, like as version, switches passed, or time stamp. |
| |
| <p>Use the ‘<samp><span class="samp">-ac</span></samp>’ option to omit false conditionals from a listing. Any lines |
| which are not assembled because of a false <code>.if</code> (or <code>.ifdef</code>, or any |
| other conditional), or a true <code>.if</code> followed by an <code>.else</code>, will be |
| omitted from the listing. |
| |
| <p>Use the ‘<samp><span class="samp">-ad</span></samp>’ option to omit debugging directives from the |
| listing. |
| |
| <p>Once you have specified one of these options, you can further control |
| listing output and its appearance using the directives <code>.list</code>, |
| <code>.nolist</code>, <code>.psize</code>, <code>.eject</code>, <code>.title</code>, and |
| <code>.sbttl</code>. |
| The ‘<samp><span class="samp">-an</span></samp>’ option turns off all forms processing. |
| If you do not request listing output with one of the ‘<samp><span class="samp">-a</span></samp>’ options, the |
| listing-control directives have no effect. |
| |
| <p>The letters after ‘<samp><span class="samp">-a</span></samp>’ may be combined into one option, |
| <em>e.g.</em>, ‘<samp><span class="samp">-aln</span></samp>’. |
| |
| <p>Note if the assembler source is coming from the standard input (e.g., |
| because it |
| is being created by <code>gcc</code> and the ‘<samp><span class="samp">-pipe</span></samp>’ command line switch |
| is being used) then the listing will not contain any comments or preprocessor |
| directives. This is because the listing code buffers input source lines from |
| stdin only after they have been preprocessed by the assembler. This reduces |
| memory usage and makes the code more efficient. |
| |
| </body></html> |
| |
