109 lines
3.9 KiB
Plaintext
109 lines
3.9 KiB
Plaintext
; Options for the ATMEL AVR port of the compiler.
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; Copyright (C) 2005-2017 Free Software Foundation, Inc.
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;
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; This file is part of GCC.
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;
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; GCC is free software; you can redistribute it and/or modify it under
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; the terms of the GNU General Public License as published by the Free
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; Software Foundation; either version 3, or (at your option) any later
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; version.
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;
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; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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; WARRANTY; without even the implied warranty of MERCHANTABILITY or
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; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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; for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with GCC; see the file COPYING3. If not see
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; <http://www.gnu.org/licenses/>.
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mcall-prologues
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Target Report Mask(CALL_PROLOGUES)
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Use subroutines for function prologues and epilogues.
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mmcu=
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Target RejectNegative Joined Var(avr_mmcu) MissingArgError(missing device or architecture after %qs)
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-mmcu=MCU Select the target MCU.
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mn-flash=
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Target RejectNegative Joined Var(avr_n_flash) UInteger Init(-1)
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Set the number of 64 KiB flash segments.
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mskip-bug
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Target Report Mask(SKIP_BUG)
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Indicate presence of a processor erratum.
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mrmw
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Target Report Mask(RMW)
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Enable Read-Modify-Write (RMW) instructions support/use.
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mdeb
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Target Report Undocumented Mask(ALL_DEBUG)
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mlog=
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Target RejectNegative Joined Undocumented Var(avr_log_details)
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mint8
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Target Report Mask(INT8)
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Use an 8-bit 'int' type.
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mno-interrupts
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Target Report RejectNegative Mask(NO_INTERRUPTS)
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Change the stack pointer without disabling interrupts.
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mbranch-cost=
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Target Report Joined RejectNegative UInteger Var(avr_branch_cost) Init(0)
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Set the branch costs for conditional branch instructions. Reasonable values are small, non-negative integers. The default branch cost is 0.
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morder1
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Target Report Undocumented Mask(ORDER_1)
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morder2
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Target Report Undocumented Mask(ORDER_2)
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mtiny-stack
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Target Report Mask(TINY_STACK)
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Change only the low 8 bits of the stack pointer.
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mrelax
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Target Report
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Relax branches.
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mpmem-wrap-around
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Target Report
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Make the linker relaxation machine assume that a program counter wrap-around occurs.
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maccumulate-args
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Target Report Mask(ACCUMULATE_OUTGOING_ARGS)
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Accumulate outgoing function arguments and acquire/release the needed stack space for outgoing 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.
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mstrict-X
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Target Report Var(avr_strict_X) Init(0)
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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.
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;; For rationale behind -msp8 see explanation in avr.h.
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msp8
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Target Report RejectNegative Var(avr_sp8) Init(0)
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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.
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Waddr-space-convert
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Warning C Report Var(avr_warn_addr_space_convert) Init(0)
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Warn if the address space of an address is changed.
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Wmisspelled-isr
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Warning C C++ Report Var(avr_warn_misspelled_isr) Init(1)
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Warn if the ISR is misspelled, i.e. without __vector prefix. Enabled by default.
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mfract-convert-truncate
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Target Report Mask(FRACT_CONV_TRUNC)
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Allow to use truncation instead of rounding towards zero for fractional fixed-point types.
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mabsdata
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Target Report Mask(ABSDATA)
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Assume that all data in static storage can be accessed by LDS / STS. This option is only useful for reduced Tiny devices.
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nodevicelib
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Driver Target Report RejectNegative
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Do not link against the device-specific library lib<MCU>.a.
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