gcc/config/avr/avr.opt

   1 ; Options for the ATMEL AVR port of the compiler.
   2
   3 ; Copyright (C) 2005, 2007, 2008, 2010, 2011, 2012
   4 ; Free Software Foundation, Inc.
   5 ;
   6 ; This file is part of GCC.
   7 ;
   8 ; GCC is free software; you can redistribute it and/or modify it under
   9 ; the terms of the GNU General Public License as published by the Free
  10 ; Software Foundation; either version 3, or (at your option) any later
  11 ; version.
  12 ;
  13 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 ; for more details.
  17 ;
  18 ; You should have received a copy of the GNU General Public License
  19 ; along with GCC; see the file COPYING3.  If not see
  20 ; <http://www.gnu.org/licenses/>.
  21
  22 mcall-prologues
  23 Target Report Mask(CALL_PROLOGUES)
  24 Use subroutines for function prologues and epilogues
  25
  26 mmcu=
  27 Target RejectNegative Joined Var(avr_mcu_index) Init(0) Enum(avr_mcu)
  28 -mmcu=MCU       Select the target MCU
  29
  30 mdeb
  31 Target Report Undocumented Mask(ALL_DEBUG)
  32
  33 mlog=
  34 Target RejectNegative Joined Undocumented Var(avr_log_details)
  35
  36 mint8
  37 Target Report Mask(INT8)
  38 Use an 8-bit 'int' type
  39
  40 mno-interrupts
  41 Target Report RejectNegative Mask(NO_INTERRUPTS)
  42 Change the stack pointer without disabling interrupts
  43
  44 mbranch-cost=
  45 Target Report Joined RejectNegative UInteger Var(avr_branch_cost) Init(0)
  46 Set the branch costs for conditional branch instructions.  Reasonable values are small, non-negative integers.  The default branch cost is 0.
  47
  48 morder1
  49 Target Report Undocumented Mask(ORDER_1)
  50
  51 morder2
  52 Target Report Undocumented Mask(ORDER_2)
  53
  54 mtiny-stack
  55 Target Report Mask(TINY_STACK)
  56 Change only the low 8 bits of the stack pointer
  57
  58 mrelax
  59 Target Report
  60 Relax branches
  61
  62 mpmem-wrap-around
  63 Target Report
  64 Make the linker relaxation machine assume that a program counter wrap-around occurs.
  65
  66 maccumulate-args
  67 Target Report Mask(ACCUMULATE_OUTGOING_ARGS)
  68 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.
  69
  70 mstrict-X
  71 Target Report Var(avr_strict_X) Init(0)
  72 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
  74 ;; For rationale behind -msp8 see explanation in avr.h.
  75 msp8
  76 Target Report RejectNegative Var(avr_sp8) Init(0)
  77 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.