aarch64-linux-gnu-4.9/share/doc/as.html/Input-Files.html - toolchains/linux-x86/gcc - Git at Google

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <!-- This file documents the GNU Assembler "as".

 Copyright (C) 1991-2013 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".
  -->
 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
 <head>
 <title>Using as: Input Files</title>

 <meta name="description" content="Using as: Input Files">
 <meta name="keywords" content="Using as: Input Files">
 <meta name="resource-type" content="document">
 <meta name="distribution" content="global">
 <meta name="Generator" content="makeinfo">
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 <link href="index.html#Top" rel="start" title="Top">
 <link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
 <link href="Overview.html#Overview" rel="up" title="Overview">
 <link href="Object.html#Object" rel="next" title="Object">
 <link href="Command-Line.html#Command-Line" rel="prev" title="Command Line">
 <style type="text/css">
 <!--
 a.summary-letter {text-decoration: none}
 blockquote.smallquotation {font-size: smaller}
 div.display {margin-left: 3.2em}
 div.example {margin-left: 3.2em}
 div.indentedblock {margin-left: 3.2em}
 div.lisp {margin-left: 3.2em}
 div.smalldisplay {margin-left: 3.2em}
 div.smallexample {margin-left: 3.2em}
 div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
 div.smalllisp {margin-left: 3.2em}
 kbd {font-style:oblique}
 pre.display {font-family: inherit}
 pre.format {font-family: inherit}
 pre.menu-comment {font-family: serif}
 pre.menu-preformatted {font-family: serif}
 pre.smalldisplay {font-family: inherit; font-size: smaller}
 pre.smallexample {font-size: smaller}
 pre.smallformat {font-family: inherit; font-size: smaller}
 pre.smalllisp {font-size: smaller}
 span.nocodebreak {white-space:nowrap}
 span.nolinebreak {white-space:nowrap}
 span.roman {font-family:serif; font-weight:normal}
 span.sansserif {font-family:sans-serif; font-weight:normal}
 ul.no-bullet {list-style: none}
 -->
 </style>


 </head>

 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
 <a name="Input-Files"></a>
 <div class="header">
 <p>
 Next: <a href="Object.html#Object" accesskey="n" rel="next">Object</a>, Previous: <a href="Command-Line.html#Command-Line" accesskey="p" rel="prev">Command Line</a>, Up: <a href="Overview.html#Overview" accesskey="u" rel="up">Overview</a> &nbsp; [<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>
 </div>
 <hr>
 <a name="Input-Files-1"></a>
 <h3 class="section">1.5 Input Files</h3>

 <a name="index-input"></a>
 <a name="index-source-program"></a>
 <a name="index-files_002c-input"></a>
 <p>We use the phrase <em>source program</em>, abbreviated <em>source</em>, to
 describe the program input to one run of <code>as</code>.  The program may
 be in one or more files; how the source is partitioned into files
 doesn&rsquo;t change the meaning of the source.
 </p>
 <p>The source program is a concatenation of the text in all the files, in the
 order specified.
 </p>
 <p>Each time you run <code>as</code> it assembles exactly one source
 program.  The source program is made up of one or more files.
 (The standard input is also a file.)
 </p>
 <p>You give <code>as</code> a command line that has zero or more input file
 names.  The input files are read (from left file name to right).  A
 command line argument (in any position) that has no special meaning
 is taken to be an input file name.
 </p>
 <p>If you give <code>as</code> no file names it attempts to read one input file
 from the <code>as</code> standard input, which is normally your terminal.  You
 may have to type <tt class="key">ctl-D</tt> to tell <code>as</code> there is no more program
 to assemble.
 </p>
 <p>Use &lsquo;<samp>--</samp>&rsquo; if you need to explicitly name the standard input file
 in your command line.
 </p>
 <p>If the source is empty, <code>as</code> produces a small, empty object
 file.
 </p>

 <a name="Filenames-and-Line_002dnumbers"></a>
 <h4 class="subheading">Filenames and Line-numbers</h4>

 <a name="index-input-file-linenumbers"></a>
 <a name="index-line-numbers_002c-in-input-files"></a>
 <p>There are two ways of locating a line in the input file (or files) and
 either may be used in reporting error messages.  One way refers to a line
 number in a physical file; the other refers to a line number in a
 &ldquo;logical&rdquo; file.  See <a href="Errors.html#Errors">Error and Warning Messages</a>.
 </p>
 <p><em>Physical files</em> are those files named in the command line given
 to <code>as</code>.
 </p>
 <p><em>Logical files</em> are simply names declared explicitly by assembler
 directives; they bear no relation to physical files.  Logical file names help
 error messages reflect the original source file, when <code>as</code> source
 is itself synthesized from other files.  <code>as</code> understands the
 &lsquo;<samp>#</samp>&rsquo; directives emitted by the <code>gcc</code> preprocessor.  See also
 <a href="File.html#File"><code>.file</code></a>.
 </p>
 <hr>
 <div class="header">
 <p>
 Next: <a href="Object.html#Object" accesskey="n" rel="next">Object</a>, Previous: <a href="Command-Line.html#Command-Line" accesskey="p" rel="prev">Command Line</a>, Up: <a href="Overview.html#Overview" accesskey="u" rel="up">Overview</a> &nbsp; [<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>
 </div>


 </body>
 </html>
	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<html>
	<!-- This file documents the GNU Assembler "as".

	Copyright (C) 1991-2013 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".
	-->
	<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
	<head>
	<title>Using as: Input Files</title>

	<meta name="description" content="Using as: Input Files">
	<meta name="keywords" content="Using as: Input Files">
	<meta name="resource-type" content="document">
	<meta name="distribution" content="global">
	<meta name="Generator" content="makeinfo">
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<link href="index.html#Top" rel="start" title="Top">
	<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
	<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
	<link href="Overview.html#Overview" rel="up" title="Overview">
	<link href="Object.html#Object" rel="next" title="Object">
	<link href="Command-Line.html#Command-Line" rel="prev" title="Command Line">
	<style type="text/css">
	<!--
	a.summary-letter {text-decoration: none}
	blockquote.smallquotation {font-size: smaller}
	div.display {margin-left: 3.2em}
	div.example {margin-left: 3.2em}
	div.indentedblock {margin-left: 3.2em}
	div.lisp {margin-left: 3.2em}
	div.smalldisplay {margin-left: 3.2em}
	div.smallexample {margin-left: 3.2em}
	div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
	div.smalllisp {margin-left: 3.2em}
	kbd {font-style:oblique}
	pre.display {font-family: inherit}
	pre.format {font-family: inherit}
	pre.menu-comment {font-family: serif}
	pre.menu-preformatted {font-family: serif}
	pre.smalldisplay {font-family: inherit; font-size: smaller}
	pre.smallexample {font-size: smaller}
	pre.smallformat {font-family: inherit; font-size: smaller}
	pre.smalllisp {font-size: smaller}
	span.nocodebreak {white-space:nowrap}
	span.nolinebreak {white-space:nowrap}
	span.roman {font-family:serif; font-weight:normal}
	span.sansserif {font-family:sans-serif; font-weight:normal}
	ul.no-bullet {list-style: none}
	-->
	</style>


	</head>

	<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
	<a name="Input-Files"></a>
	<div class="header">
	<p>
	Next: <a href="Object.html#Object" accesskey="n" rel="next">Object</a>, Previous: <a href="Command-Line.html#Command-Line" accesskey="p" rel="prev">Command Line</a>, Up: <a href="Overview.html#Overview" accesskey="u" rel="up">Overview</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>
	</div>
	<hr>
	<a name="Input-Files-1"></a>
	<h3 class="section">1.5 Input Files</h3>

	<a name="index-input"></a>
	<a name="index-source-program"></a>
	<a name="index-files_002c-input"></a>
	<p>We use the phrase <em>source program</em>, abbreviated <em>source</em>, to
	describe the program input to one run of <code>as</code>. The program may
	be in one or more files; how the source is partitioned into files
	doesn’t change the meaning of the source.
	</p>
	<p>The source program is a concatenation of the text in all the files, in the
	order specified.
	</p>
	<p>Each time you run <code>as</code> it assembles exactly one source
	program. The source program is made up of one or more files.
	(The standard input is also a file.)
	</p>
	<p>You give <code>as</code> a command line that has zero or more input file
	names. The input files are read (from left file name to right). A
	command line argument (in any position) that has no special meaning
	is taken to be an input file name.
	</p>
	<p>If you give <code>as</code> no file names it attempts to read one input file
	from the <code>as</code> standard input, which is normally your terminal. You
	may have to type <tt class="key">ctl-D</tt> to tell <code>as</code> there is no more program
	to assemble.
	</p>
	<p>Use ‘<samp>--</samp>’ if you need to explicitly name the standard input file
	in your command line.
	</p>
	<p>If the source is empty, <code>as</code> produces a small, empty object
	file.
	</p>

	<a name="Filenames-and-Line_002dnumbers"></a>
	<h4 class="subheading">Filenames and Line-numbers</h4>

	<a name="index-input-file-linenumbers"></a>
	<a name="index-line-numbers_002c-in-input-files"></a>
	<p>There are two ways of locating a line in the input file (or files) and
	either may be used in reporting error messages. One way refers to a line
	number in a physical file; the other refers to a line number in a
	“logical” file. See <a href="Errors.html#Errors">Error and Warning Messages</a>.
	</p>
	<p><em>Physical files</em> are those files named in the command line given
	to <code>as</code>.
	</p>
	<p><em>Logical files</em> are simply names declared explicitly by assembler
	directives; they bear no relation to physical files. Logical file names help
	error messages reflect the original source file, when <code>as</code> source
	is itself synthesized from other files. <code>as</code> understands the
	‘<samp>#</samp>’ directives emitted by the <code>gcc</code> preprocessor. See also
	<a href="File.html#File"><code>.file</code></a>.
	</p>
	<hr>
	<div class="header">
	<p>
	Next: <a href="Object.html#Object" accesskey="n" rel="next">Object</a>, Previous: <a href="Command-Line.html#Command-Line" accesskey="p" rel="prev">Command Line</a>, Up: <a href="Overview.html#Overview" accesskey="u" rel="up">Overview</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>
	</div>



	</body>
	</html>