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<h3 class="section">7.45 <code>.equiv </code><var>symbol</var><code>, </code><var>expression</var></h3>
<p><a name="index-_0040code_007bequiv_007d-directive-320"></a>The <code>.equiv</code> directive is like <code>.equ</code> and <code>.set</code>, except that
the assembler will signal an error if <var>symbol</var> is already defined. Note a
symbol which has been referenced but not actually defined is considered to be
undefined.
<p>Except for the contents of the error message, this is roughly equivalent to
<pre class="smallexample"> .ifdef SYM
.err
.endif
.equ SYM,VAL
</pre>
<p>plus it protects the symbol from later redefinition.
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