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Goto Label xxx in other file...

Dear all,
I have a question about jumping to some specific label in other file(in Keil C51 project)

Ex. In file A there is one label named _xxx. In file B can we use

goto _xxx

?
(maybe _xxx should be declared as extern, right ?)

The reason why I want this is: We did NOT want to do the tasks before label _xxx because they are wrong...! And unfornately file A is located in ROM and we can not modify it...

So we want to just jump to label _xxx and skip wrong codes....

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