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Symbol related function in a scatter file

The symbol related function defined allows you to assign different values depending on whether or not a global symbol is defined.

The symbol related function, defined(global_symbol_name) returns zero if global_symbol_name is not defined and nonzero if it is defined.


The following scatter file shows an example of conditionalizing a base address based on the presence of the symbol version1:

LR1 0x8000
    ER1 (defined(version1) ? 0x8000 : 0x10000)   ; Base address is 0x8000
                                                 ; if version1 is defined
                                                 ; 0x10000 if not
    ER2 +0
        *(+RW +ZI)
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