1 ; Options for the ATMEL AVR port of the compiler.
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5 ; This file is part of GCC.
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22 Target Report Mask(CALL_PROLOGUES)
23 Use subroutines for function prologues and epilogues
26 Target RejectNegative Joined Var(avr_mcu_index) Init(0) Enum(avr_mcu)
27 -mmcu=MCU Select the target MCU
30 Target Report Undocumented Mask(ALL_DEBUG)
33 Target RejectNegative Joined Undocumented Var(avr_log_details)
36 Target Report Mask(INT8)
37 Use an 8-bit 'int' type
40 Target Report RejectNegative Mask(NO_INTERRUPTS)
41 Change the stack pointer without disabling interrupts
44 Target Report Joined RejectNegative UInteger Var(avr_branch_cost) Init(0)
45 Set the branch costs for conditional branch instructions. Reasonable values are small, non-negative integers. The default branch cost is 0.
48 Target Report Undocumented Mask(ORDER_1)
51 Target Report Undocumented Mask(ORDER_2)
54 Target Report Mask(TINY_STACK)
55 Change only the low 8 bits of the stack pointer
63 Make the linker relaxation machine assume that a program counter wrap-around occurs.
66 Target Report Mask(ACCUMULATE_OUTGOING_ARGS)
67 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.
70 Target Report Var(avr_strict_X) Init(0)
71 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.
73 ;; For rationale behind -msp8 see explanation in avr.h.
75 Target Report RejectNegative Var(avr_sp8) Init(0)
76 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.
79 Warning C Report Var(avr_warn_addr_space_convert) Init(0)
80 Warn if the address space of an address is changed.
82 mfract-convert-truncate
83 Target Report Mask(FRACT_CONV_TRUNC)
84 Allow to use truncation instead of rounding towards 0 for fractional int types