dfx schrieb:
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?
These are built-in defines, some of the AVR-specific ones are explained at
http://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html
In order to find the location of a definition, add -g3 -save-temps to
the compiler command options and inspect the respective .i (for C) or
.ii (for C++) files. It lists how a macro is defined and where a
definition comes from, e.g. command line, built-in or some source #define.
Johann
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