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Ax51 attempt to define an already defined label

Florian Mitnacht

I'm trying to use the ax51 standard macro assembler to find a way to determine if a symbol or label is already defined. Something like the following pseudo code:

if label "table_abc" is defined, do nothing, else do the following:
table_abc: DB 1 DB 2 DB 3
endif

I somehow thought the following could work but alas it does not:
IF NOT :DEF:table_abc
table_abc: DB 1 DB 2 DB 3
ENDIF

-> LABEL NOT PERMITTED, SYNTAX ERROR

My code is 100 percent assembler code so I try to not use the C preprocessor. But if there is no other way, a C preprocessor code example would help as well.

EFM8BB31, Silicon Labs Simplicity Studio v3, Keil 8051 v9.53 debug

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