The following options are target specific: -maccumulate-args Accumulate outgoing function arguments and acquire/release the needed stack space for outpoing function arguments in function prologue/ epilogue. Without this option, outgoing arguments are pushed before calling a function and popped afterwards. This option can lead to reduced code size for functions that call many functions that get their arguments on the stack like, for example printf. -mbranch-cost= Set the branch costs for conditional branch instructions. Reasonable values are small, non- negative integers. The default branch cost is 0. -mcall-prologues Use subroutines for function prologues and epilogues -mint8 Use an 8-bit 'int' type -mmcu=MCU Select the target MCU -mno-interrupts Change the stack pointer without disabling interrupts -mpmem-wrap-around Make the linker relaxation machine assume that a program counter wrap-around occurs. -mrelax Relax branches -msp8 The device has no SPH special function register. This option will be overridden by the compiler driver with the correct setting if presence/ absence of SPH can be deduced from -mmcu=MCU. -mstrict-X When accessing RAM, use X as imposed by the hardware, i.e. just use pre-decrement, post- increment and indirect addressing with the X register. Without this option, the compiler may assume that there is an addressing mode X+const similar to Y+const and Z+const and emit instructions to emulate such an addressing mode for X. -mtiny-stack Change only the low 8 bits of the stack pointer Known MCU names: at43usb320 at43usb355 at76c711 at86rf401 at90c8534 at90can128 at90can32 at90can64 at90pwm1 at90pwm161 at90pwm2 at90pwm216 at90pwm2b at90pwm3 at90pwm316 at90pwm3b at90pwm81 at90s1200 at90s2313 at90s2323 at90s2333 at90s2343 at90s4414 at90s4433 at90s4434 at90s8515 at90s8535 at90scr100 at90usb1286 at90usb1287 at90usb162 at90usb646 at90usb647 at90usb82 at94k ata5272 ata5505 ata5790 ata5790n ata5795 ata6285 ata6286 ata6289 atmega103 atmega128 atmega1280 atmega1281 atmega1284 atmega1284p atmega128a atmega128rfa1 atmega16 atmega161 atmega162 atmega163 atmega164a atmega164p atmega164pa atmega165 atmega165a atmega165p atmega165pa atmega168 atmega168a atmega168p atmega168pa atmega169 atmega169a atmega169p atmega169pa atmega16a atmega16hva atmega16hva2 atmega16hvb atmega16hvbrevb atmega16m1 atmega16u2 atmega16u4 atmega2560 atmega2561 atmega26hvg atmega32 atmega323 atmega324a atmega324p atmega324pa atmega325 atmega3250 atmega3250a atmega3250p atmega3250pa atmega325a atmega325p atmega328 atmega328p atmega329 atmega3290 atmega3290a atmega3290p atmega3290pa atmega329a atmega329p atmega329pa atmega32a atmega32c1 atmega32hvb atmega32hvbrevb atmega32m1 atmega32u2 atmega32u4 atmega32u6 atmega406 atmega48 atmega48a atmega48hvf atmega48p atmega48pa atmega64 atmega640 atmega644 atmega644a atmega644p atmega644pa atmega645 atmega6450 atmega6450a atmega6450p atmega645a atmega645p atmega649 atmega6490 atmega6490a atmega6490p atmega649a atmega649p atmega64a atmega64c1 atmega64hve atmega64m1 atmega64rfa2 atmega64rfr2 atmega8 atmega8515 atmega8535 atmega88 atmega88a atmega88p atmega88pa atmega8a atmega8hva atmega8u2 atmxt112sl atmxt224 atmxt224e atmxt336s atmxt540s atmxt540sreva attiny11 attiny12 attiny13 attiny13a attiny15 attiny1634 attiny167 attiny22 attiny2313 attiny2313a attiny24 attiny24a attiny25 attiny26 attiny261 attiny261a attiny28 attiny4313 attiny43u attiny44 attiny44a attiny45 attiny461 attiny461a attiny48 attiny84 attiny84a attiny85 attiny861 attiny861a attiny87 attiny88 atxmega128a1 atxmega128a1u atxmega128a3 atxmega128a3u atxmega128a4u atxmega128b1 atxmega128b3 atxmega128c3 atxmega128d3 atxmega128d4 atxmega16a4 atxmega16a4u atxmega16c4 atxmega16d4 atxmega16x1 atxmega192a3 atxmega192a3u atxmega192c3 atxmega192d3 atxmega256a3 atxmega256a3b atxmega256a3bu atxmega256a3u atxmega256c3 atxmega256d3 atxmega32a4 atxmega32a4u atxmega32c4 atxmega32d4 atxmega32e5 atxmega32x1 atxmega384c3 atxmega384d3 atxmega64a1 atxmega64a1u atxmega64a3 atxmega64a3u atxmega64a4u atxmega64b1 atxmega64b3 atxmega64c3 atxmega64d3 atxmega64d4 avr1 avr2 avr25 avr3 avr31 avr35 avr4 avr5 avr51 avr6 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 m3000 Assembler options ================= Use "-Wa,OPTION" to pass "OPTION" to the assembler. Known MCU names: avr1 avr2 avr25 avr3 avr31 avr35 avr4 avr5 avr51 avr6 avrxmega1 avrxmega2 avrxmega3 avrxmega4 avrxmega5 avrxmega6 avrxmega7 at90s1200 attiny11 attiny12 attiny15 attiny28 at90s2313 at90s2323 at90s2333 at90s2343 attiny22 attiny26 at90s4414 at90s4433 at90s4434 at90s8515 at90c8534 at90s8535 attiny13 attiny13a attiny2313 attiny2313a attiny24 attiny24a attiny4313 attiny44 attiny44a attiny84 attiny84a attiny25 attiny45 attiny85 attiny261 attiny261a attiny461 attiny461a attiny861 attiny861a attiny87 attiny43u attiny48 attiny88 at86rf401 at43usb355 at76c711 atmega103 at43usb320 attiny167 at90usb82 at90usb162 atmega8u2 atmega16u2 atmega32u2 atmega8 ata6289 atmega48 atmega48a atmega48p atmega88 atmega88a atmega88p atmega88pa atmega8515 atmega8535 atmega8hva at90pwm1 at90pwm2 at90pwm2b at90pwm3 at90pwm3b at90pwm81 atmega16 atmega16a atmega161 atmega162 atmega163 atmega164a atmega164p atmega165 atmega165a atmega165p atmega168 atmega168a atmega168p atmega169 atmega169a atmega169p atmega169pa atmega32 atmega323 atmega324a atmega324p atmega324pa atmega325 atmega325a atmega325p atmega325pa atmega3250 atmega3250a atmega3250p atmega3250pa atmega328 atmega328p atmega329 atmega329a atmega329p atmega329pa atmega3290 atmega3290a atmega3290p atmega3290pa atmega406 atmega64 atmega640 atmega644 atmega644a atmega644p atmega644pa atmega645 atmega645a atmega645p atmega649 atmega649a atmega649p atmega6450 atmega6450a atmega6450p atmega6490 atmega6490a atmega6490p atmega64rfr2 atmega644rfr2 atmega16hva atmega16hva2 atmega16hvb atmega16hvbrevb atmega32hvb atmega32hvbrevb atmega64hve at90can32 at90can64 at90pwm161 at90pwm216 at90pwm316 atmega32c1 atmega64c1 atmega16m1 atmega32m1 atmega64m1 atmega16u4 atmega32u4 atmega32u6 at90usb646 at90usb647 at90scr100 at94k m3000 atmega128 atmega1280 atmega1281 atmega1284p atmega128rfa1 atmega128rfr2 atmega1284rfr2 at90can128 at90usb1286 at90usb1287 atmega2560 atmega2561 atmega256rfr2 atmega2564rfr2 atxmega16a4 atxmega16d4 atxmega16x1 atxmega32a4 atxmega32d4 atxmega32x1 atxmega64a3 atxmega64d3 atxmega64a1 atxmega64a1u atxmega128a3 atxmega128b1 atxmega128d3 atxmega192a3 atxmega192d3 atxmega256a3 atxmega256a3b atxmega256a3bu atxmega256d3 atxmega128a1 atxmega128a1u Assembler messages: Fatal error: unknown MCU: list-devices