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.equiv
symbol,
expressionThe .equiv
directive is like .equ
and .set
, except that
the assembler will signal an error if symbol is already defined. Note a
symbol which has been referenced but not actually defined is considered to be
undefined.
Except for the contents of the error message, this is roughly equivalent to
.ifdef SYM .err .endif .equ SYM,VAL
plus it protects the symbol from later redefinition.