Hi,
Alban:
But is there a complete list somewhere??
Not really.
Libc defines a few processor specific macros...
http://www.nongnu.org/avr-libc/user-manual/group__avr__io.html
It takes some coaxing but it is possible to get avr-g++ to reveal the list of supported processors...
Known MCU names:
avr2
at90s2313
at90s2323
at90s2333
at90s2343
attiny22
attiny26
at90s4414
at90s4433
at90s4434
at90s8515
at90c8534
at90s8535
avr25
ata6289
attiny13
attiny13a
attiny2313
attiny2313a
attiny24
attiny24a
attiny4313
attiny44
attiny44a
attiny84
attiny25
attiny45
attiny85
attiny261
attiny261a
attiny461
attiny461a
attiny861
attiny861a
attiny43u
attiny87
attiny48
attiny88
at86rf401
avr3
at43usb320
at43usb355
at76c711
avr31
atmega103
avr35
at90usb82
at90usb162
atmega8u2
atmega16u2
atmega32u2
attiny167
avr4
atmega8
atmega48
atmega48a
atmega48p
atmega88
atmega88a
atmega88p
atmega88pa
atmega8515
atmega8535
atmega8hva
atmega4hvd
atmega8hvd
at90pwm1
at90pwm2
at90pwm2b
at90pwm3
at90pwm3b
at90pwm81
avr5
atmega16
atmega16a
atmega161
atmega162
atmega163
atmega164a
atmega164p
atmega165
atmega165a
atmega165p
atmega168
atmega168a
atmega168p
atmega169
atmega169a
atmega169p
atmega169pa
atmega16c1
atmega16hva
atmega16hva2
atmega16hvb
atmega16m1
atmega16u4
atmega32
atmega323
atmega324a
atmega324p
atmega324pa
atmega325
atmega325p
atmega3250
atmega3250p
atmega328
atmega328p
atmega329
atmega329p
atmega329pa
atmega3290
atmega3290p
atmega32c1
atmega32hvb
atmega32m1
atmega32u4
atmega32u6
atmega406
atmega64
atmega640
atmega644
atmega644a
atmega644p
atmega644pa
atmega645
atmega645a
atmega645p
atmega6450
atmega6450a
atmega6450p
atmega649
atmega649a
atmega649p
atmega6490
atmega6490a
atmega6490p
atmega64c1
atmega64m1
atmega64hve
at90can32
at90can64
at90pwm216
at90pwm316
at90scr100
at90usb646
at90usb647
at94k
avr51
atmega128
atmega1280
atmega1281
atmega1284p
atmega128rfa1
at90can128
at90usb1286
at90usb1287
m3000f
m3000s
m3001b
avr6
atmega2560
atmega2561
avrxmega2
atxmega16a4
atxmega16d4
atxmega32d4
avrxmega3
atxmega32a4
avrxmega4
atxmega64a3
atxmega64d3
avrxmega5
atxmega64a1
avrxmega6
atxmega128a3
atxmega128d3
atxmega192a3
atxmega192d3
atxmega256a3
atxmega256a3b
atxmega256d3
avrxmega7
atxmega128a1
avr1
at90s1200
attiny11
attiny12
attiny15
attiny28
So, when compiling for the atmega2560, the compiler automatically defines the macro AVR_ATmega2560.