; Options for the ATMEL AVR port of the compiler.
-; Copyright (C) 2005, 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
+; Copyright (C) 2005-2020 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
mcall-prologues
Target Report Mask(CALL_PROLOGUES)
-Use subroutines for function prologues and epilogues
+Use subroutines for function prologues and epilogues.
mmcu=
-Target RejectNegative Joined Var(avr_mcu_index) Init(0) Enum(avr_mcu)
--mmcu=MCU Select the target MCU
+Target RejectNegative Joined Var(avr_mmcu) MissingArgError(missing device or architecture after %qs)
+-mmcu=MCU Select the target MCU.
+
+mgas-isr-prologues
+Target Report Var(avr_gasisr_prologues) UInteger Init(0)
+Allow usage of __gcc_isr pseudo instructions in ISR prologues and epilogues.
+
+mn-flash=
+Target RejectNegative Joined Var(avr_n_flash) UInteger Init(-1)
+Set the number of 64 KiB flash segments.
+
+mskip-bug
+Target Report Mask(SKIP_BUG)
+Indicate presence of a processor erratum.
+
+mrmw
+Target Report Mask(RMW)
+Enable Read-Modify-Write (RMW) instructions support/use.
mdeb
Target Report Undocumented Mask(ALL_DEBUG)
mlog=
Target RejectNegative Joined Undocumented Var(avr_log_details)
+mshort-calls
+Target Report RejectNegative Mask(SHORT_CALLS)
+Use RJMP / RCALL even though CALL / JMP are available.
+
mint8
Target Report Mask(INT8)
-Use an 8-bit 'int' type
+Use an 8-bit 'int' type.
mno-interrupts
Target Report RejectNegative Mask(NO_INTERRUPTS)
-Change the stack pointer without disabling interrupts
+Change the stack pointer without disabling interrupts.
mbranch-cost=
Target Report Joined RejectNegative UInteger Var(avr_branch_cost) Init(0)
Set the branch costs for conditional branch instructions. Reasonable values are small, non-negative integers. The default branch cost is 0.
+mmain-is-OS_task
+Target Report Mask(MAIN_IS_OS_TASK)
+Treat main as if it had attribute OS_task.
+
morder1
Target Report Undocumented Mask(ORDER_1)
morder2
Target Report Undocumented Mask(ORDER_2)
-mshort-calls
-Target Report Mask(SHORT_CALLS)
-Use rjmp/rcall (limited range) on >8K devices
-
mtiny-stack
Target Report Mask(TINY_STACK)
-Change only the low 8 bits of the stack pointer
+Change only the low 8 bits of the stack pointer.
mrelax
Target Report
-Relax branches
+Relax branches.
mpmem-wrap-around
Target Report
maccumulate-args
Target Report Mask(ACCUMULATE_OUTGOING_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.
+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.
mstrict-X
Target Report Var(avr_strict_X) Init(0)
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.
-mbranch-cost=
-Target Report RejectNegative Joined UInteger Var(avr_branch_cost) Init(0)
-Set the cost of a branch instruction. Default value is 0.
+;; For rationale behind -msp8 see explanation in avr.h.
+msp8
+Target Report RejectNegative Var(avr_sp8) Init(0)
+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.
+
+Waddr-space-convert
+Warning C Report Var(avr_warn_addr_space_convert) Init(0)
+Warn if the address space of an address is changed.
+
+Wmisspelled-isr
+Warning C C++ Report Var(avr_warn_misspelled_isr) Init(1)
+Warn if the ISR is misspelled, i.e. without __vector prefix. Enabled by default.
+
+mfract-convert-truncate
+Target Report Mask(FRACT_CONV_TRUNC)
+Allow to use truncation instead of rounding towards zero for fractional fixed-point types.
+
+mabsdata
+Target Report Mask(ABSDATA)
+Assume that all data in static storage can be accessed by LDS / STS. This option is only useful for reduced Tiny devices.
+
+mdouble=
+Target Report Joined RejectNegative Var(avr_double) Init(0) Enum(avr_bits_e)
+-mdouble=<BITS> Use <BITS> bits wide double type.
+
+mlong-double=
+Target Report Joined RejectNegative Var(avr_long_double) Init(0) Enum(avr_bits_e)
+-mlong-double=<BITS> Use <BITS> bits wide long double type.
+
+nodevicelib
+Driver Target Report RejectNegative
+Do not link against the device-specific library lib<MCU>.a.
+
+Enum
+Name(avr_bits_e) Type(int)
+Available BITS selections:
+
+EnumValue
+Enum(avr_bits_e) String(32) Value(32)
+
+EnumValue
+Enum(avr_bits_e) String(64) Value(64)
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