65 lines
2.5 KiB
HTML
65 lines
2.5 KiB
HTML
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<html lang="en">
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<head>
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<title>Equiv - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<link rel="prev" href="Equ.html#Equ" title="Equ">
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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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</head>
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<body>
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<div class="node">
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<a name="Equiv"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Eqv.html#Eqv">Eqv</a>,
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Previous: <a rel="previous" accesskey="p" href="Equ.html#Equ">Equ</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.28 <code>.equiv </code><var>symbol</var><code>, </code><var>expression</var></h3>
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<p><a name="index-g_t_0040code_007bequiv_007d-directive-337"></a>The <code>.equiv</code> directive is like <code>.equ</code> and <code>.set</code>, except that
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the assembler will signal an error if <var>symbol</var> is already defined. Note a
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symbol which has been referenced but not actually defined is considered to be
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undefined.
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<p>Except for the contents of the error message, this is roughly equivalent to
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<pre class="smallexample"> .ifdef SYM
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.err
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.endif
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.equ SYM,VAL
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</pre>
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<p>plus it protects the symbol from later redefinition.
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</body></html>
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