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132 lines
5.0 KiB
HTML
132 lines
5.0 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>Errors (Using as)</title>
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<meta name="description" content="Errors (Using as)">
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<meta name="keywords" content="Errors (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="Overview.html#Overview" rel="up" title="Overview">
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<link href="Invoking.html#Invoking" rel="next" title="Invoking">
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<link href="Object.html#Object" rel="prev" title="Object">
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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="Errors"></a>
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<div class="header">
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<p>
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Previous: <a href="Object.html#Object" accesskey="p" rel="prev">Object</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>
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</div>
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<hr>
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<a name="Error-and-Warning-Messages"></a>
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<h3 class="section">1.7 Error and Warning Messages</h3>
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<a name="index-error-messages"></a>
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<a name="index-warning-messages"></a>
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<a name="index-messages-from-assembler"></a>
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<p><code>as</code> may write warnings and error messages to the standard error
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file (usually your terminal). This should not happen when a compiler
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runs <code>as</code> automatically. Warnings report an assumption made so
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that <code>as</code> could keep assembling a flawed program; errors report a
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grave problem that stops the assembly.
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</p>
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<a name="index-format-of-warning-messages"></a>
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<p>Warning messages have the format
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</p>
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<div class="smallexample">
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<pre class="smallexample">file_name:<b>NNN</b>:Warning Message Text
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</pre></div>
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<p><a name="index-file-names-and-line-numbers_002c-in-warnings_002ferrors"></a>
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(where <b>NNN</b> is a line number). If both a logical file name
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(see <a href="File.html#File"><code>.file</code></a>) and a logical line number
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(see <a href="Line.html#Line"><code>.line</code></a>)
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have been given then they will be used, otherwise the file name and line number
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in the current assembler source file will be used. The message text is
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intended to be self explanatory (in the grand Unix tradition).
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</p>
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<p>Note the file name must be set via the logical version of the <code>.file</code>
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directive, not the DWARF2 version of the <code>.file</code> directive. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> .file 2 "bar.c"
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error_assembler_source
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.file "foo.c"
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.line 30
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error_c_source
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</pre></div>
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<p>produces this output:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> Assembler messages:
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asm.s:2: Error: no such instruction: `error_assembler_source'
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foo.c:31: Error: no such instruction: `error_c_source'
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</pre></div>
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<a name="index-format-of-error-messages"></a>
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<p>Error messages have the format
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</p>
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<div class="smallexample">
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<pre class="smallexample">file_name:<b>NNN</b>:FATAL:Error Message Text
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</pre></div>
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<p>The file name and line number are derived as for warning
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messages. The actual message text may be rather less explanatory
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because many of them aren’t supposed to happen.
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</p>
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</body>
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</html>
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