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132 lines
5.8 KiB
HTML
132 lines
5.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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 1.3
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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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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>a (Using as)</title>
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<meta name="description" content="a (Using as)">
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<meta name="keywords" content="a (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Invoking.html#Invoking" rel="up" title="Invoking">
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<link href="alternate.html#alternate" rel="next" title="alternate">
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<link href="Invoking.html#Invoking" rel="prev" title="Invoking">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="a"></a>
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<div class="header">
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<p>
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Next: <a href="alternate.html#alternate" accesskey="n" rel="next">alternate</a>, Up: <a href="Invoking.html#Invoking" accesskey="u" rel="up">Invoking</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Enable-Listings_003a-_002da_005bcdghlns_005d"></a>
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<h3 class="section">2.1 Enable Listings: <samp>-a[cdghlns]</samp></h3>
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<a name="index-_002da"></a>
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<a name="index-_002dac"></a>
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<a name="index-_002dad"></a>
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<a name="index-_002dag"></a>
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<a name="index-_002dah"></a>
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<a name="index-_002dal"></a>
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<a name="index-_002dan"></a>
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<a name="index-_002das"></a>
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<a name="index-listings_002c-enabling"></a>
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<a name="index-assembly-listings_002c-enabling"></a>
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<p>These options enable listing output from the assembler. By itself,
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‘<samp>-a</samp>’ 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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‘<samp>-ah</samp>’ requests a high-level language listing,
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‘<samp>-al</samp>’ requests an output-program assembly listing, and
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‘<samp>-as</samp>’ requests a symbol table listing.
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High-level listings require that a compiler debugging option like
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‘<samp>-g</samp>’ be used, and that assembly listings (‘<samp>-al</samp>’) be requested
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also.
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</p>
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<p>Use the ‘<samp>-ag</samp>’ 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>
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<p>Use the ‘<samp>-ac</samp>’ 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>
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<p>Use the ‘<samp>-ad</samp>’ option to omit debugging directives from the
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listing.
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</p>
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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 ‘<samp>-an</samp>’ option turns off all forms processing.
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If you do not request listing output with one of the ‘<samp>-a</samp>’ options, the
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listing-control directives have no effect.
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</p>
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<p>The letters after ‘<samp>-a</samp>’ may be combined into one option,
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<em>e.g.</em>, ‘<samp>-aln</samp>’.
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</p>
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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 ‘<samp>-pipe</samp>’ 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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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="alternate.html#alternate" accesskey="n" rel="next">alternate</a>, Up: <a href="Invoking.html#Invoking" accesskey="u" rel="up">Invoking</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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