92 lines
3.9 KiB
HTML
92 lines
3.9 KiB
HTML
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<html lang="en">
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<head>
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<title>Errors - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Overview.html#Overview" title="Overview">
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<link rel="prev" href="Object.html#Object" title="Object">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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pre.smallexample { font-size:smaller }
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pre.smalllisp { font-size:smaller }
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span.sc { font-variant:small-caps }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Errors"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Object.html#Object">Object</a>,
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Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a>
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<hr>
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</div>
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<h3 class="section">1.7 Error and Warning Messages</h3>
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<!-- man begin DESCRIPTION -->
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<p><a name="index-error-messages-40"></a><a name="index-warning-messages-41"></a><a name="index-messages-from-assembler-42"></a><samp><span class="command">as</span></samp> 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 <samp><span class="command">as</span></samp> automatically. Warnings report an assumption made so
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that <samp><span class="command">as</span></samp> could keep assembling a flawed program; errors report a
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grave problem that stops the assembly.
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<!-- man end -->
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<p><a name="index-format-of-warning-messages-43"></a>Warning messages have the format
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<pre class="smallexample"> file_name:<b>NNN</b>:Warning Message Text
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</pre>
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<p class="noindent"><a name="index-file-names-and-line-numbers_002c-in-warnings_002ferrors-44"></a>(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>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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<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>
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<p>produces this output:
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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>
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<p><a name="index-format-of-error-messages-45"></a>Error messages have the format
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<pre class="smallexample"> file_name:<b>NNN</b>:FATAL:Error Message Text
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</pre>
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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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</body></html>
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