@@ -20,27 +20,27 @@
mcall-prologues
Target Mask(CALL_PROLOGUES) Optimization
-Use subroutines for function prologues and epilogues.
+Optimization. Use subroutines for function prologues and epilogues.
mmcu=
Target RejectNegative Joined Var(avr_mmcu) MissingArgError(missing device or architecture after %qs)
--mmcu=MCU Select the target MCU.
+-mmcu=<MCU> Select the target MCU.
mgas-isr-prologues
Target Var(avr_gasisr_prologues) UInteger Init(0) Optimization
-Allow usage of __gcc_isr pseudo instructions in ISR prologues and epilogues.
+Optimization. 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.
+This option is used internally. Set the number of 64 KiB flash segments.
mskip-bug
Target Mask(SKIP_BUG)
-Indicate presence of a processor erratum.
+This option is used internally. Indicate presence of a processor erratum. Do not skip 32-bit instructions.
mrmw
Target Mask(RMW)
-Enable Read-Modify-Write (RMW) instructions support/use.
+This option is used internally. Enable Read-Modify-Write (RMW) instructions support/use.
mdeb
Target Undocumented Mask(ALL_DEBUG)
@@ -50,7 +50,7 @@ Target RejectNegative Joined Undocumented Var(avr_log_details)
mshort-calls
Target RejectNegative Mask(SHORT_CALLS)
-Use RJMP / RCALL even though CALL / JMP are available.
+This option is used internally for multilib generation and selection. Assume RJMP / RCALL can target all program memory.
mint8
Target Mask(INT8)
@@ -62,11 +62,11 @@ Change the stack pointer without disabling interrupts.
mbranch-cost=
Target Joined RejectNegative UInteger Var(avr_branch_cost) Init(0) Optimization
-Set the branch costs for conditional branch instructions. Reasonable values are small, non-negative integers. The default branch cost is 0.
+-mbranch-cost=<cost> Optimization. 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 Mask(MAIN_IS_OS_TASK) Optimization
-Treat main as if it had attribute OS_task.
+Optimization. Treat main as if it had attribute OS_task.
morder1
Target Undocumented Mask(ORDER_1)
@@ -80,7 +80,7 @@ Change only the low 8 bits of the stack pointer.
mrelax
Target Optimization
-Relax branches.
+Optimization. Relax branches.
mpmem-wrap-around
Target
@@ -88,15 +88,15 @@ Make the linker relaxation machine assume that a program counter wrap-around occ
maccumulate-args
Target Mask(ACCUMULATE_OUTGOING_ARGS) Optimization
-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.
+Optimization. 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 Var(avr_strict_X) Init(0) Optimization
-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.
+Optimization. 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.
mflmap
Target Var(avr_flmap) Init(0)
-The device has the bitfield NVMCTRL_CTRLB.FLMAP. This option is used internally.
+This option is used internally. The device has the bitfield NVMCTRL_CTRLB.FLMAP.
mrodata-in-ram
Target Var(avr_rodata_in_ram) Init(-1)
@@ -105,15 +105,15 @@ The device has the .rodata section located in the RAM area.
;; For rationale behind -msp8 see explanation in avr.h.
msp8
Target 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.
+This option is used internally for multilib generation and selection. The device has no SPH special function register.
mfuse-add
-Target Alias(mfuse-add=, 1, 0) Optimization
-Split register additions from load/store instructions. Most useful on Reduced Tiny.
+Target Alias(mfuse-add=, 2, 0) Optimization
+Optimization. Split register additions from load/store instructions. Most useful on Reduced Tiny.
mfuse-add=
Target Joined RejectNegative UInteger Var(avr_fuse_add) Init(0) Optimization IntegerRange(0, 3)
-Split register additions from load/store instructions. Most useful on Reduced Tiny.
+-mfuse-add=<0,2> Optimization. Split register additions from load/store instructions. Most useful on Reduced Tiny.
Waddr-space-convert
Warning C Var(avr_warn_addr_space_convert) Init(0)
@@ -129,7 +129,7 @@ Allow to use truncation instead of rounding towards zero for fractional fixed-po
mabsdata
Target Mask(ABSDATA)
-Assume that all data in static storage can be accessed by LDS / STS. This option is only useful for reduced Tiny devices.
+Assume that all data in static storage can be accessed by LDS / STS instructions. This option is only useful for reduced Tiny devices like ATtiny40.
mdouble=
Target Joined RejectNegative Var(avr_double) Init(0) Enum(avr_bits_e) Save
This patch unifies help screen messages. Johann -- AVR: Overhaul help screen gcc/ * config/avr/avr.opt: Overhaul help screen.