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| <h3 class="section">7.44 <code>.equiv </code><var>symbol</var><code>, </code><var>expression</var></h3> |
| |
| <p><a name="index-g_t_0040code_007bequiv_007d-directive-322"></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. |
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| <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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