GNU Info

(as.info)Equiv

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`.equiv SYMBOL, EXPRESSION'
===========================

   The `.equiv' directive is like `.equ' and `.set', except that the
assembler will signal an error if SYMBOL is already defined.

   Except for the contents of the error message, this is roughly
equivalent to
     .ifdef SYM
     .err
     .endif
     .equ SYM,VAL