Location of symbol definition

dfx <[email protected]>
Newsgroups gmane.comp.hardware.avr.gcc
Organization dfx s.r.l.
Message-ID <[email protected]>
Hi,
often in code written by 'gurus' I find expressions of the type
   # if defined (__AVR_ATmega168__), but looking at the code I can not 
find the definition anywhere.

The question is: where these symbols (with double underscore) are defined?

thank you very much

-- 
Domenico



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